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      Volume 19, No. 6 | 2021
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      • ZHANG Ziyang, FAN Fei, CHANG Shengjiang

        2021,19(6):951-962, DOI: 10.11805/TKYDA2021331

        Abstract:

        Terahertz(THz) waves have a wide range of applications in the field of sensing because of their good coherence, high signal-noise ratio, and low radiation energy. In addition, THz sensing also has the advantages of real-time, non-contact, label-free and non-ionization, so it has important applications in biochemical sensing, especially the sensing of biologically active substances. Nevertheless, THz sensing also has disadvantages such as low sensitivity, strong water absorption, limited detection information, and poor applicability. This review introduces the series of work of our research group in THz time-domain polarization spectroscopy sensing technology, which takes microstructure devices as sensors and uses transmission or reflection sensing methods to detect several biochemical samples of cells, amino acids and Deoxyribo Nucleic Acid(DNA), respectively. The experimental results show that: compared with the traditional resonance sensing method, the Q-factor and sensing sensitivity of the polarization sensing method are significantly improved; the reflective sensing effectively avoids the absorption of THz by water, and realizes the sensing of active biochemical samples in liquid environment; taking chiral microstructure devices as sensors, or taking chiral THz waves as excitation fields, the polarization response of the sample can be enhanced as well as the sensing sensitivity, and the sensing of chiral molecular is realized.

      • LIU Changchun, ZHAO Jianbo, ZHANG Taotao

        2021,19(6):963-967, DOI: 10.11805/TKYDA20210602

        Abstract:

        With the rapid development of THz technology, the waveguide attenuator used in THz system has also become a hotspot. The THz waveguide attenuator can accurately attenuate and control the power transmission, which shows special significance and plays an irreplaceable role in solving the problems of loss, radiation and interference. The current waveguide attenuator would destroy the wave guide transmission line and result in the RF leakage because it places the attenuation plate paralleling to the electric field. Based on the principle of the absorbent waveguide attenuator, a waveguide attenuator with the attenuation plate perpendicular to the electric field is proposed. The attenuation plate is attached to the inner wall of the waveguide. The waveguide attenuator is realized and optimized by using the HFSS software and changing the shape, position and other parameters of the attenuation plate. The return loss is less than -27.5 dB in 110-170 GHz, and the attenuator accuracy is less than ±2 dB in the attenuation of 20 dB.

      • LIU Lefu, LIU Linsheng, LU Ye, LI Chuanqi

        2021,19(6):968-972, DOI: 10.11805/TKYDA2021219

        Abstract:

        Photoconductive antenna has the advantages of room temperature operation, compact design and wide-band radiation, but its wide application is limited by low radiation power caused primarily by low optical absorptivity. The traditional antenna electrode has no tip structure and the edge electric field is weak, which leads to low light absorption. In order to improve the radiation power of photoconductive antenna, a triangular array antenna electrode structure is designed. The electrode structure is composed of five triangular tips. Finite Difference Time Domain(FDTD) method is adopted to study the electric field enhancement of the electrode and the light absorption of the substrate under 800 nm femtosecond laser irradiation. The results show that this structure increases the area of laser incidence on the substrate and reduces the optical carrier transmission distance. In the case of no electric field, the optical absorption reaches 30.57%, which is 161% higher than that of the traditional antenna. Triangular array electrode structure provides a new idea for the design of traditional electrode structure, which is expected to be combined with nanostructures to further improve the radiation power.

      • HU Dan, FU Maixia, ZHU Qiaofen

        2021,19(6):973-977, DOI: 10.11805/TKYDA2021248

        Abstract:

        A tunable broadband terahertz absorber based on graphene metamaterial is proposed and numerically demonstrated. The absorber consists of three layers: the upper is the graphene metamaterial layer, the middle is the SiO2 layer, and the bottom is the metallic layer. Simulation results demonstrate that the proposed absorber achieves over 90% absorption in 1.11- 2.61 THz with a relative bandwidth of 80.6% when Fermi level ?c=0.7 eV. The peak absorption rate of the proposed absorber can be tuned from 20.32% to 98.56% by changing the Fermi energy of graphene from 0 eV to 0.7 eV. Additionally, the proposed absorber is insensitive to polarization and has high absorbance to wide incidence angles. Such design may have some potential applications in thermal imaging, thermal detecting, and stealth technique.

      • TAN Zhen, DING Jiangqiao, ZHANG Qinyi, LIU Dong

        2021,19(6):978-983, DOI: 10.11805/TKYDA2021294

        Abstract:

        A -16 dB waveguide coupler for the Local Oscillator(LO) signal in 400-500 GHz band is developed in order to meet the application requirements of terahertz sideband-separating receivers, mainly considering the weak coupling of LO signal, the high directivity of Radio Frequency(RF) signal and current milling process accuracy. The characteristic of the coupling degree of the branch coupler is analyzed. The design of a -16 dB waveguide coupler is conducted. The device is processed based on Computer Numerical Control(CNC) technology and the result is discussed. The measured results of both samples show that this coupler can work in 400-500 GHz band (factional bandwidth of 22.5%), obtaining the coupling coefficient for the LO signal in -16~-17 dB, the directivity for RF signal of -1.2 dB, the isolation degree better than -20 dB, and the return loss of each port better than -15 dB. The performance is highly consistent with that of the simulations, which indicates that current CNC technology can meet the high precision requirements for the fabrication of such high frequency waveguide coupler.

      • XU Ziwen, FENG Jiao, LI Peng, ZHANG Xiaofei

        2021,19(6):984-989, DOI: 10.11805/TKYDA2019333

        Abstract:

        The Likelihood Ascend Search(LAS) algorithm is a heuristic neighborhood search algorithm that detects the received signals of large–scale Multiple–Input–Multiple–Output(MIMO) systems with space–division multiplexing. A Constellation Constraint–LAS(CC–LAS) is proposed for reducing the computational complexity of the traditional LAS algorithm. The algorithm first introduces a novel CC structure to determine the reliability of each candidate solution. Then, according to the reliability determination result, the neighborhood space of the candidate solution is narrowed. Finally, the unreliable candidate solution is detected by using the LAS algorithm. The proposed CC–LAS algorithm eliminates the inefficient processing of low–reliability signals by ignoring a large number of unnecessary neighbor vectors in the LAS neighborhood space. Hence, CC–LAS algorithm is capable of greatly reducing the computational complexity of the traditional LAS algorithm. The simulation results show that the BER performance of the proposed CC–LAS algorithm is very close to that of the traditional LAS algorithm; nevertheless, the computational complexity can be greatly reduced under the same Signal–to–Noise Ratio(SNR) compared to traditional LAS algorithm.

      • DU Wenlong, HUANG Yu

        2021,19(6):990-995, DOI: 10.11805/TKYDA2020052

        Abstract:

        A joint estimation algorithm based on grid search is proposed in order to realize the joint estimation of synchronous damage and channel in Multiple Input Multiple Output(MIMO)-Orthogonal Frequency Division Multiplexing(OFDM) system. Firstly, by constructing a system model to reflect the influence of synchronous damage and channel response, the multi-dimensional optimization problem of each damage parameter estimation is then simplified into two-dimensional grid and one-dimensional grid search, so as to realize the joint estimation of carrier frequency offset, sampling frequency offset and symbol timing error. The numerical simulation results show that the proposed joint estimation algorithm has better estimation performance than the non-joint estimation algorithm.

      • SHI Rong, DENG Ke

        2021,19(6):996-1001, DOI: 10.11805/TKYDA20210608

        Abstract:

        The phase difference measurement accuracy for the channels receiving signals in the interferometer is discussed. After the limitations of the traditional formula are pointed out, a theoretical computation formula of the standard deviation for the phase difference measurement error of the channels receiving signals in the interferometer is proposed by using the signal energy SNR (Signal-to-Noise Ratio) instead of the in-band power SNR. In theory, the universality of the formula is proved from the point of view of demodulation and match filtering. And the correctness of the theoretical analysis is verified by the simulation for various modulated signals and pulse series signals. It reflects that the standard deviation of the phase difference measurement error for the channels receiving signals in the interferometer is inversely proportional to the square root of the signal energy SNR. This theoretical result provides a general guidance for the computation, demonstration and analysis of direction finding accuracy index in interferometer engineering application.

      • YANG Hui, LIU Xiangwei, JI Haixiang, XIA Xiang

        2021,19(6):1002-1007, DOI:

        Abstract:

        A robust beamforming algorithm based on covariance matrix reconstruction is proposed to solve the sensitivity problem of Capon beamforming under error condition. The algorithm divides the spatial domain of the signal set into interference region and signal region, and then divides the two regions into several independent and non-overlapping parts. The interference covariance matrix is constructed by integrating the interference region, and then the noise covariance matrix is reconstructed by using the minimum eigenvalue of the sample covariance matrix. Finally, the expected signal guidance vector error is modeled by the ring uncertainty set, and the Capon spectrum integration is performed on the ring uncertainty set to estimate the expected signal covariance matrix, and the expected signal guidance vector is obtained according to its main eigenvector. Simulation results show that compared with the traditional robust beamforming algorithm, the performance of this method is more excellent and stable under the conditions of different snapshot numbers and input Signal-to-Noise Ratio(SNR). At the same time, it bears the advantage of low computation.

      • YIN Xiaochun, CAI Chenxiao, LI Jianlin

        2021,19(6):1008-1013, DOI: 10.11805/TKYDA20210610

        Abstract:

        Non-intrusive eye tracking plays an important role in many vision-based human computer interaction applications. How to ensure the robustness of external interference and tracking precision during eye tracking is the key problem to its applications owing to the strong nonlinearity of eye motion. To improve the robustness and precision of eye tracking, the Strong Tracking fifth-degree Cubature Kalman Filter(ST-5thCKF) algorithm is proposed. The algorithm introduces the suboptimal fading factor of Strong Tracking Filter(STF) into fifth-degree Cubature Kalman Filter(5thCKF) which almost has the least cubature sampling points while maintaining the fifth-degree filtering accuracy. The proposed algorithm bears the high filtering precision to strong nonlinearity of 5thCKF, as well as the robustness to external interference of STF. The experimental results under practical conditions show the validity of the proposed algorithm in eye tracking.

      • JING Shuxia, SHEN Tongqiang

        2021,19(6):1014-1019, DOI: 10.11805/TKYDA2020470

        Abstract:

        In order to enable secondary or unlicensed users to obtain idle subbands on a given broadband for use, the broadband spectrum sensing technology in cognitive radio is discussed and an effective broadband spectrum sensing algorithm is proposed. The algorithm first uses Hidden Markov Model(HMM) to model the dynamic behavior of primary users to overcome the limitations of current broadband sensing technologies. Secondly, the proposed algorithm uses the existing narrowband sensing technology to divide the sensing spectrum band into smaller channels and model it as a balanced binary tree; then the spectrum holes are recursively searched. If any holes are detected to be adjacent in frequency, they are merged into a single spectrum hole for maximizing the capacity of cognitive secondary users over the entire frequency band. The simulation results show that compared with the existing broadband spectrum sensing methods, the proposed broadband spectrum sensing algorithm has better sensing performance gain and stronger robustness.

      • FAN Yu, ZHAO Shu’an

        2021,19(6):1020-1026, DOI: 10.11805/TKYDA2020169

        Abstract:

        Aiming at the issue of localization for mobile nodes in hybrid Line-Of-Sight/Non-Line-Of-Sight(LOS/NLOS) environments, a large-scale network node localization scheme based on Time-of-Arrival(ToA) measurements and error mitigation is proposed. Firstly, nodes equipped with Ultra-Wide Band(UWB) radio move randomly for collecting ToA measurements, and the shortest path selection algorithm is conducted to obtain the multi-hop node distance including the one-hop node distance with NLOS error mitigation. Then, the initial node positions are determined by using Multi-Dimensional Scaling(MDS). Finally, unlocalized node positions are obtained by the combination of iterative trilateration and error accumulation management. The simulation results show that the location accuracy of the proposed location scheme is superior to that of other common schemes.

      • ZHOU Yanhui, LIU Hao, ZHANG Cheng, NIU Lijie, GUO Xi, GUO Tianshu

        2021,19(6):1027-1032, DOI:

        Abstract:

        Near–field imaging is an important application area of interference passive millimeter-wave imaging technology, and the array configuration is an important factor affecting the near–field phase error. In this paper, a 2–D synthetic aperture near–field imaging simulation system is built to implement functions such as target scene generation, near/far field forward simulation, image reconstruction, and near–field phase error correction. This system is utilized to quantitatively evaluate and analyze the near–field errors of different 2–D antenna arrays with the same spatial resolution. For the two–unit near–field scanning imaging test system, a self–calibration method is proposed to correct the receiver channel error and near–field phase error respectively. Compared with the near–field imaging method based on a reference point source, this method requires only a priori distance information and no need to image the reference point source, which bears the advantages of simple operation and fast imaging speed.

      • ZHANG Jun, LI Zhu, SU Meng

        2021,19(6):1033-1036, DOI: 10.11805/TKYDA2020115

        Abstract:

        Traditional multi-band low-profile parabolic antennas bear the disadvantages of complex structure and the inability to multi-band work simultaneously. A novel design method is introduced in this paper. The proposed quad-band antenna works on the frequency of 14-14.5 GHz,11.45-12.75 GHz,19.6- 21.2 GHz,29.4-31 GHz. The whole antenna adopts a two-slot-depths horn feed, shaped sub-reflector and main reflector. The reflectors are designed by the aperture field distribution function and polynomial transition function. The overall antenna structure is optimized with full-wave electromagnetic software. The test result shows the efficiency in the entire frequency band is improved by at least 12%, and the first side lobe is controlled below -14 dB, which meets the performance requirements. This design has been applied to actual equipment successfully.

      • YANG Bo, MENG Qingdong

        2021,19(6):1037-1040, DOI: 10.11805/TKYDA2020108

        Abstract:

        A miniaturized tri-band Long Term Evolution(LTE) microstrip antenna based on the Composite Right/Left-Handed Transmission Line(CRLH) theory is studied. The microstrip antenna is miniaturized by using the zero-order resonance characteristic of CRLH. The simulation results show that the three operating frequency bands of the microstrip antenna are: 1 840-1 860 MHz, 2 130-2 160 MHz, 2 620-2 660 MHz. The Band3, Band4, and Band7 of the Frequency Division Duplexing(FDD) LTE plan are accurately covered. The electrical length is 0.17λ. Finally, the microstrip antenna is processed and measured to verify the accuracy and effectiveness of the simulation. The multi-frequency miniaturized antenna can not only save the antenna feed resources of the base station greatly, but also cut the cost of base station construction effectively.

      • DU Zhe, GONG Linshu, WANG Yi, HUANG Xinhua, FENG Anan

        2021,19(6):1041-1046, DOI: 10.11805/TKYDA2020009

        Abstract:

        The shipborne missile is considered as an on-board device when it is on duty and an aircraft when it is in flight. GJB151B-2013 specifies that the shipborne platform equipment needs to be tested by the CS106 project. Nevertheless, the missile is not directly connected to the ship's power grid. If the assessment is still based on the spike signal index specified in GJB151B-2013, it is obvious that there exists a case of over testing. In view of the tailoring requirements of the shipborne missiles in the electromagnetic compatibility CS106 index, the evaluation requirements are fully analyzed and studied, and experimental cutting recommendations are derived.

      • LIN Xiaofei, ZHANG Dongmin, FENG Ju, LIAO Cheng

        2021,19(6):1047-1052, DOI: 10.11805/TKYDA2020162

        Abstract:

        A method of rapidly building radio environment map based on three-dimensional parabolic equation is studied, and the accuracy and applicability of several spatial interpolation methods are discussed, which provides an effective tool for network optimization and management. Firstly, the electric field distribution in large area and complex environment is calculated by using parabolic equation. Then, four typical research areas are selected with reference to the best statistical unit in geography, and Kriging, Inverse Distance Weighting(IDW), biharmonic spline interpolation and several interpolation methods based on triangulation are adopted to analyze the research area. It shows that several kinds of triangulation interpolation and biharmonic spline interpolation have the smallest RMSE and the shortest time in each region, but the degree of spatial fitting is the lowest; Kriging has the highest spatial fitting degree in each region, and the RMSE and time vary with the semi-variance model; IDW has a good spatial fitting and RMSE in each region, but it takes the longest time. Among several spatial interpolation methods, the Kriging of the exponential model can construct the radio environment map based on the three-dimensional parabolic equation with the highest accuracy and applicability.

      • FU Song

        2021,19(6):1053-1056, DOI: 10.11805/TKYDA2020198

        Abstract:

        With the increasing density of 5G base station in recent years, the influence of the electromagnetic radiation level of 5G base station has become one of the most important factors restricting the development of 5G communication technology. In order to solve the problem of electromagnetic radiation limits around 5G base station, an evaluation method is proposed to predict the electromagnetic radiation level of 5G base station. Assuming that the user capacity of the cell covered by the base station is known, a statistical model is adopted to calculate the maximum power density around the base station. On ANSYS Savant, the accuracy and feasibility of the predictive method are verified by simulating the maximum power density around the 5G base station. This method has certain guiding significance for future location of base station.

      • TAN Zhengchao, SUO Bin, YANG Zhanping

        2021,19(6):1057-1064, DOI: 10.11805/TKYDA2020063

        Abstract:

        In Risk Priority Number(RPN) analysis based on Multi-Criteria Decision Making(MCDM), it is critically important to determine the weight of each expert in Failure Mode, Effects and Criticality Analysis(FMECA) of a product. For a widely used type of experts’ opinions, interval number information, subjective weights are determined by the index system of employment years, working experience and familiarity degree. Then based on the similarities of each two experts’ opinions, the method to calculate the objective weight is conducted. The multi-sources experts’ opinions are fused by an integrated weighting on the basis of above subjective and objective weights. At last, the effectiveness of proposed method is validated by a criticality analysis of the intrinsically safe power supply applied in mine.

      • ZHANG Qianyu, JIA Wei, PENG Bo

        2021,19(6):1065-1069, DOI: 10.11805/TKYDA2020136

        Abstract:

        Manual screening of trigeminal nerves requires high professional quality and is time consuming for clinicians. Using deep learning to automatically detect trigeminal nerve regions in cranial Magnetic Resonance Imaging (MRI) can provide a reliable input image for subsequent trigeminal nerve segmentation. YOLO(You Only Look Once) network is utilized to automatically detect the trigeminal nerve region of the cranial magnetic resonance image to improve the inference speed, and to systematically evaluate the inference performance of the NVIDIA TensorRT framework under different computing platforms. The experimental results show that the YOLO target detection network can accurately detect the area where the trigeminal nerve is located. Simultaneously, under the NVIDIA TensorRT framework, when the input brain MRI resolution is (204×204), the YOLOv2 network detects the optimized trigeminal nerve through the CPU platform, embedded GPU platform, desktop GPU platform and professional GPU computing card platform, the frame rates per second can reach 0.1 FPS, 23.4 FPS, and 793.7 FPS . This provides important reference for the subsequent development of portable trigeminal neural segmentation equipment.

      • ZHANG Jinfeng

        2021,19(6):1070-1074, DOI: 10.11805/TKYDA2019352

        Abstract:

        The severe overlapping of particle tracks seriously affects the measurement accuracy of particle track. A new method is proposed based on track overlapping classification to separate and measure the severe overlapping of particle tracks. Firstly, the overlapped tracks are classified according to the inclusion of particle track centers to identify the severity of particle overlapping. Then, the non-overlapping particles are scaled to half to form structural units. The finite erosion operations are applied to the severely overlapped particle tracks based on these structural elements. These particle tracks are separated, and form four kinds of track classification images. Experimental results show that these severely overlapped particle tracks can be separated by combining track overlapping classification and finite erosion operations, which can eliminate the influence of track overlapping on the image measurement accuracy.

      • SU Linghua, WANG Ping, MA Zhiqiang, ZHANG Qian

        2021,19(6):1075-1080, DOI: 10.11805/TKYDA2020106

        Abstract:

        Effective compression of hyperspectral images is of great significance for real-time transmission. In this paper, spectral linear decomposition is introduced into efficient compression of hyperspectral image. According to the Linear Mixed Model(LMM), the hyperspectral data is decomposed into the product of endmember and abundance. At the encoder, the necessary data processing is performed on the endmembers and abundance, followed by JPEG-LS lossless compression. At the decoder, the original hyperspectral image is reconstructed by multiplying the final decoded endmembers and abundance, moreover, the effect of the quantization step on the rate-distortion performance is discussed. Experimental results show that the proposed method can achieve certain compression performance.

      • GUO Yuan, JIANG Jinlin, CHEN Wei

        2021,19(6):1081-1085, DOI: 10.11805/TKYDA2020376

        Abstract:

        Aiming at the complicated iterative operations of traditional Compressed Sensing(CS), long reconstruction time and poor quality, a compressed sensing reconstruction algorithm for Non-linear Measurement Convolutional Neural Network(NMECNN) is proposed by combining the deep learning method. This algorithm compresses the overall width and height of the image as a measurement network to replace the traditional random measurement matrix for image reconstruction. At the same time, it uses multiple expanded convolutional layers and upsampling PixelShuffle methods to obtain detailed information of different scales of the image. Through experimental comparison with other documents, the average Peak Signal to Noise Ratio(PSNR) values of this algorithm at different sampling rates are higher than that of MSRNets algorithm by 1 dB,0.7 dB,0.82 dB,1.61 dB, and the Structural Similarity(SSIM) values are higher by 0.03,0.04,0.24,0.10 units. The reconstruction time in the CPU is less than that of the MSRNet algorithm by 0.175 5 s,0.399 8 s,0.41 s,0.396 s, respectively. Through big data sets and noise experiments, it is verified that the image reconstruction quality of this algorithm is significantly improved, the reconstruction time is greatly shortened, and it has a strong ability to resist noise attacks.

      • GAO Li, CHENG Weibin, LI Mingjun, ZHANG Lulu, WEI Na, ZHANG Nan

        2021,19(6):1086-1090, DOI: 10.11805/TKYDA2020058

        Abstract:

        Short distance acoustic communication technology under the oil well is the key to transmitting the borehole information measured by the near-bit sensor to the Measurement While Drilling(MWD). In order to explore the transmission characteristics of the sonic carrier signal in the short-distance drill pipe, the finite element method is adopted to establish a 1.28 m long drill pipe model, and an excitation load with a frequency of 20 Hz and a duty ratio of 50% is applied to the drill pipe to simulate the calculation of the radial receiving point response of the rod and the characteristic frequency of the drill rod structure. The transmission characteristics of the acoustic wave in the short distance drill rod are analyzed as well. The results show that when the drill pipe is subjected to an excitation load under the initial conditions, the acoustic signal at the receiving point of the drill pipe has an enveloping curve that decays exponentially, and its interior is a cosine periodic signal with gradually decreasing amplitude, and finally stable at a new equilibrium position; when the drill pipe continues to be loaded, the acoustic signal will continue to decay on the basis of the previous steady state, and eventually decays and stabilizes in the initial state. The simulation results are in good agreement with theoretical analysis and experimental results. This work can provide basic model for the simulation of sound wave transmission in multiple drill pipes.

      • WANG Jingjing, WANG Pengjun, CUI Yi, SHI Yijian

        2021,19(6):1091-1096, DOI: 10.11805/TKYDA2020059

        Abstract:

        Aiming at the problems of complex distribution and the lack of comprehensive and effective pre-warning methods for power cables, a cable temperature pre-warning system based on the Gray Markov model is proposed. Firstly, the overall structure of the temperature pre-warning system and the data communication method are analyzed. The communication method combining Long Range(LoRa) and General Packet Radio Service(GPRS) is utilized to ensure the reliability of data acquisition. Secondly, the gray Markov model is adopted to predict the cable temperature. The prediction result is collected for fault identification in a cable temperature pre-warning model to improve the accuracy of the pre-warning system. Finally, the feasibility of the cable temperature pre-warning is verified by experiments and an early warning platform is built for cable temperature classification. The timely notification of various faults to enterprise management personnel is realized by this means.

      • WANG Cheng, LI Min

        2021,19(6):1097-1102, DOI: 10.11805/TKYDA2020182

        Abstract:

        A cubature information particle multi-sensors fusion algorithm is proposed to improve the precision of multi-sensors fusion. The algorithm combines Cubature Information Filter(CIF) with Particle Filter(PF), and adopts CIF to propagate particles of PF. The measurement information of multiple sensors is updated into particles of PF by introducing information contribution vector and information contribution matrix, to increase the approximation degree of particles to really posterior probability distribution, and to improve the precision of multi-sensors fusion. Meanwhile, the algorithm takes the state estimation of CIF as current particles, to eliminate the influence of random disturbance on multi-sensors fusion, and the precision of multi-sensors fusion is further improved. Simulation and experiment results show that, the algorithm can deal with the centralized multi-sensors fusion problem, and the filtering precision is high.

      • ZHANG Hongjun, LIU Hui

        2021,19(6):1103-1107, DOI: 10.11805/TKYDA2020119

        Abstract:

        Wireless Sensor Networks(WSNs) consist a set of sensor nodes whose primary task is to sense and relay the data to sink. Sensor nodes are powered by a battery, and most of the energy is consumed for the relay of the data. The closer the nodes are from the sink, the more the data will be relayed, and the faster the energy will be consumed, which results in energy-hole problem. The introduction of a mobile sink for collecting the data from the nodes can avoid the energy-hole problem. Particle Swarm Optimization-based Rendezvous Point Selection(PSO-RPS) is proposed, which considers the data delivery delay and traffic rate constraints of sensor nodes for rendezvous point selection, and finds an optimal number of rendezvous points by particle swarm optimization. On this basis, the delay-ef?cient trajectory of mobile sink for data collection is built. Simulation results show that the proposed PSO-RPS algorithm can effectively control the path length and reduce the time delay of data collection.

      • ZHOU Feng, LIU Ke

        2021,19(6):1108-1113, DOI: 10.11805/TKYDA2019385

        Abstract:

        Mobile users and wireless devices are now the sources of a large volume of data. In such data-intensive mobile and wireless computing systems, Delay-Tolerant Network(DTN) routing plays a critical role in data routing, dissemination, and collection. Therefore, Contact Duration-based Routing (CDR) is proposed in this paper. A new routing problem that the transmission of large volume of data cannot be completed in one contact is introduced ?rstly for data-intensive routing. Then the weight of the path is calculated by three kinds of information including contacting frequency, contacting duration and the available space of the cache area. Taking the path with the maximum weight as the shortest path, data is transmitted according to this path. Simulation results show that compared with Spray-and-Wait(SW) routing, CDR routing can effectively improve packet delivery rate.

      • ZHANG Rui, GENG Quanfeng, LYU Yuntong, SU Xin

        2021,19(6):1114-1119, DOI:

        Abstract:

        The system architecture and function of an Internet+ based integrated intelligent power business hall are proposed aiming at the problems of incomplete system functions, weak information interaction, low service level, and scattered operation and management in the traditional electric power business hall. Firstly, the user requirements are analyzed to improve the service business architecture and network architecture of the intelligent business hall, and the functions that need to be realized by the intelligent business hall are analyzed comprehensively and systematically. Combined with the accurate matching function of the data of the intelligent power business hall, the reliability and stability of the service of the power business hall are effectively improved. This study will enhance the user experience, operational efficiency and the competitiveness of the electric power enterprises effectively compared with the existing research, and will provide reference for the future development of the electric power business hall.

      • DUAN Xiaofei, GAO Tongqiang

        2021,19(6):1120-1125, DOI: 10.11805/TKYDA2020025

        Abstract:

        Chua's circuit is a kind of chaotic circuit with simple structure and easy realization. Chua's diode is the core of Chua's circuit. Most of the existing Chua's diode models are implemented by dual-supply operational amplifiers and resistors. This paper sets the appropriate bias point for the operational amplifier and realizes the model of Chua's diode with a single power supply circuit. In the circuit implementation, the linear inductors used in the existing Chua’s circuit have the disadvantage of high price and difficult precision control. To tackle these problems, this paper takes the active simulated inductors to replace the linear inductors. The board-level circuit is designed and tested for two kinds of active simulated inductors. The test results indicate that using simulated inductor will not affect the chaos of the circuit under +5 V single power supply.

      • MA Zhaocan, LI Hongliang, LU Benzhuo

        2021,19(6):1126-1133, DOI: 10.11805/TKYDA2020047

        Abstract:

        The model of interface traps and body defects caused by radiation ionization damage in oxides in semiconductor devices is studied. Using the Backward Euler method to deal with the time discretion and using the linearity method to deal with the nonlinear drift-diffusion reaction equation, the numerical simulation of the interface traps and body traps generated by the silica layer in the Metal–Insulator–Semiconductor(MIS) structure is completed. The algorithm is implemented on the high-performance parallel finite element software―Parallel Hierarchical Grid(PHG). The numerical results of the simulation are consistent with the Enhanced Low Dose Rate Sensitivity(ELDRS) in the ionization damage experiment and the data under different hydrogen ambient conditions. The corresponding models are analyzed aiming for the simulation results.

      • CHENG Ming, YU Haisheng, FU Peng, XIE Xianjin

        2021,19(6):1134-1137, DOI: 10.11805/TKYDA2019333

        Abstract:

        A radiation hardening pre-regulated high voltage power supply is studied. The factors affecting the output voltage before and after neutron irradiation are analyzed. The radiation effect of key component transistor is analyzed and verified by experiments. Two optimization measures for static work point optimization and Darlinton transistor structure are put forward. The validation prototype is fabricated, and the experimental results after 1 MeV equivalent neutron 2×1013n/cm2 flux coincide with the theoretical analysis values, which confirms the effectiveness of radiation hardening measures.

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      The "In Press" section displays the articles officially accepted after peer review. These articles are currently under copyediting process without volume/issue information, but are citable according to their Digital Object Identifiers(DOI).

      • 黄清顺,Deng bing

        Doi: 10.11805/TKYDA2020419

        Abstract:

        Aiming at the sensitivity of dual-UAV passive radar to the initial value of direct passive location (DPD) of broadband radiator targets, this paper proposes a direct passive location algorithm based on Niche Vector Particle Swarm (NTVIPSO). The algorithm in this paper is The direct method and the indirect method are combined, relying on the indirect method to construct the constraint conditions by using the niche vector particle swarm to solve the exact position. The simulation results show that the particle swarm algorithm in this paper is superior to the vector particle swarm algorithm and the neighborhood topology particles Group algorithm. The accuracy of the proposed direct passive determination algorithm under the constraint of scale difference in the presence of disturbance is lower than the direct method but better than the indirect method, and the computational complexity is lower than the direct method but better than the indirect met-hod

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        • LIN Jia-sen,LI Zhi,LI Qiao-feng,MA Yi-sen

          2012,10(1):22-26, Doi:

          Abstract:

          Effective choice of the solution is essential to achieve a real-time, bi-directional(full- duplex) communication of the smart grid. The Power Line Carrier(PLC) technology provides a low-cost solution, which suits China's own national conditions. In this paper, the advantages of OFDM PLC modulation technology are introduced. A PLC module of system model is established through the analysis of the input impedance under the low-voltage power line channel. The high-speed PLC module based on low-voltage Power Line is also designed according to the studies of power line channel. The results show that the design of the PLC module has featured high receiving sensitivity and anti-noise ability.

        • WANG Yi,LIAO Xiao-ju,PAN Ze-you

          2011,9(1):7-11, Doi:

          Abstract:

          With the development of Internet applications, users’ demand for bandwidth is soaring sharply. Meanwhile,along with the development of broadband access technology, the endpoint can also adopt multiple network accesses. But due to one-way communication of traditional Transmission Control Protocol(TCP),the waste of resources will exist. To this end,IETF has specifically proposed Multi-Path TCP(MPTCP) to implement TCP multiplexing,thereby enhancing the efficiency and robustness. This paper gives a review of the IETF’s research on MPTCP,including MPTCP architecture, routing and congestion control, aiming to provide a reference for deeply studying.

        • JIANG Xiao-guo,YANG Xing-lin,LI Hong,WEN Long,SHI Jin-shui,ZHANG Kai-zhi,LI Jing,WANG Yuan

          2010,8(5):573-576, Doi:

          Abstract:

          The requirements for micro stress measurement of strain gauge are high precision,high linearity,high stability and high gain. One kind of differential amplifier circuit with excellent performance was designed. Some skillful techniques were adopted to avoid common voltage in the circuit and to reduce the temperature drift. The gain linearity is about 0.01%,and its Common-Mode Rejection Ratio(CMRR) is about 129 dB under work conditions.

        • WANG Xiao-xia,CHEN Lian,LI Xin-yao

          2010,8(5):569-572, Doi:

          Abstract:

          Traditional methods and instruments are not able to measure the true Root Mean Square(RMS) of distortion sine wave or non-sine signal accurately. This article introduces a method to measure the true RMS of any high frequency signal by using the true RMS measurement IC,AD536A,designed by AD corporation. The paper analyses the difference between the RMS measured by the average measure method and the true RMS in theory. It explains the disadvantages of current RMS measure method,and presents the design of true RMS measure circuit. The experiment results prove that the proposed method and circuit can measure the true RMS of any high frequency signal accurately.

        • XIAO Yong-jian,XIAO Li,SUN Zhi-gang

          2013,11(4):583-587, Doi:

          Abstract:

          Aiming at the problems in existing underground personnel positioning systems, an assisted positioning method based on pedestrian dead reckoning is proposed. Low-cost Inertial Measurement Unit(IMU) and magnetometer are employed to constitute a stable Attitude Heading Reference System (AHRS). The theory of inertial navigation is utilized, an algorithm for step detection is described, and Zero velocity Update(ZUPT) is adopted for velocity and position estimation to compose a pedestrian dead reckoning system. An experiment is performed in the corridor of a laboratory building to emulate the underground mine road environment. The experimental results demonstrate that the dead reckoning performs well and this method is an effective complement to existing underground positioning by improving the positioning accuracy.

        • WANG Bo,ZHANG Yan

          2015,13(1):1-12, Doi: 10.11805/TKYDA201501.0001

          Abstract:

          Terahertz(THz) optoelectronics has promoted the development of the THz generation, transparent control, and detection methods,and hastened many devices in the past decades. Especially, THz metamaterials and metasurfaces will exhibit extraordinary electromagnetic response when the subwavelength scale metal structure is excited by the THz illumination. Therefore, they have been applied to the devices such as wave beam shaper, waveguide, and modulator etc. The THz metamaterials and metasurfaces also show the potential applications in the research fields such as sensors, communications, and radars. In this paper, the works about the spectrum and wavefront modulation with THz metadevices carried out in our group are summarized. The basic theory and corresponding experiment results for different devices are introduced. It is expected these works can pave the avenue of the application of the THz metadevices.

        • LI Mo,SUN Peng,SONG Yu,DAI Gang,ZHANG Jiana

          2015,13(1):160-168, Doi: 10.11805/TKYDA201501.0160

          Abstract:

          According to the requirements of safe, simple and nondestructive radiation effect investigation of semiconductor devices, the method of laser simulation was proposed and greatly promoted. Compared with large-scale facilities, laser simulation has various unique advantages. It helps understand the ionization radiation effect in depth and is an effective low-cost, table-top supplement for the hardness assurance. Its research shows great significance for radiation effect study in both theory and practice. In this paper, the basic principles of the interactions of γ and laser with semiconductor devices are firstly presented. Then the physical basics and characteristics of laser simulation are given, with the research progress review followed. The existing problems of current research are deeply discussed providing with feasible research approaches. In the end, necessary research contents in the future are proposed.

        • ZHOU Tian,YUE Yantao,XU Guanxiong,ZHANG Yangyang,JI Chunlin

          2015,13(1):76-79, Doi: 10.11805/TKYDA201501.0076

          Abstract:

          Ultra-wideband(UWB) communication shows its advantages of fast data transfer(100 Mb/s or above) in a relatively short distance(typically below 10 m) with relatively weak power consumption (energy spectrum below -41.3 dBm/MHz). Integrated with Multiple Input Multiple Output(MIMO) technology, channel capacity could be further enhanced. As a critical link in the ultrawideband communication,UWB antenna needs extra efforts in design optimization to boost the performance of the whole system. UWB antenna is defined as the antenna whose bandwidth exceeds 500 MHz or relative bandwidth greater than 20%. This paper takes the most representative Vivaldi antenna as a show case for multi-objective optimization design with statistical methods. The optimized miniaturized antenna(sized130 mm×100 mm) shows a -10 dB bandwidth of 2.4 GHz. The design method provides guidance in common wideband,multi-parameter antenna design.

        • JIANG Xiao-ping,LI Zhong-jie,YU Xiao-feng

          2010,8(4):451-454, Doi:

          Abstract:

          Radio Frequency IDentification(RFID) series Radio Frequency(RF) card has been applied widely because of its stability,reliability and easy operation features. Aiming at multiple protocols,such as ISO14443 protocol,ISO15693 protocol and Tag-it protocol,this study proposed a new type of circuit design based on Advanced RISC Machine(ARM) for the RFID series RF card reader. The data stream encryption was implemented by using peripheral device in the operation. The system composition,working principle and work flow were introduced. Then,the detailed circuit design of the RF network and encryption hardware were presented,and the test and analysis for the design were performed. The results showed that the circuit could accurately read, write and encrypt various types of card within effective range.

        • ZHANG Lidong,DAI Zuoxing

          2015,13(1):31-34, Doi: 10.11805/TKYDA201501.0031

          Abstract:

          The background requirements of the fuze antenna in terahertz spectrum as well as its advantages and disadvantages are introduced. The working principles and application characteristics of dielectric lens antenna in terahertz frequency are analyzed in order to implement the terahertz fuze antenna. The longitudinal size of H plane horn antenna can be reduced effectively by using fuze antenna formed by an H plane horn with dielectric lens antenna. The terahertz fuze antenna with different beam angles is achieved by focal technology of lens. The feasibility of the technology solution is verified through simulation.

        • HE Xiao-dong,DING Li

          2010,8(3):313-317, Doi:

          Abstract:

          High-speed data acquisition system is an important component in modern radar signal processing. A design of high-speed data acquisition system based on band-pass sampling was presented and applied to the signal processing of wideband receiver. The Virtex Series FPGA was used as the main platform to control the high-speed ADC08D1000 for completing data acquisition, transmission,storage and signal processing. High-speed First Input First Output(FIFOs) were selected as the storage devices to implement data rate conversion. The system realized the software and hardware design,and test results verified the feasibility of the solution.

        • JIA Zhuo,LIU Hao,DENG Yifeng,DENG Hong

          2015,13(1):174-178, Doi: 10.11805/TKYDA201501.0174

          Abstract:

          The Spatial Light Modulation(SLM) technology has been widely applied to the fields of threshold switch, high speed optical interconnection and optical logic operations, which demands good performance on the real-time and fast optical signal addressing. Compared with Electro-Addressing SLM(EA-SLM), Optically-Addressing SLM(OA-SLM) shows great advantages of fast speed and high resolution by parallel addressing. Nevertheless, how to achieve fast and stable optically addressing is the key point in practice. Based on ZnO thin film as a photoconductive layer, Liquid Crystal OASLM(LC-OASLM) is designed and fabricated; the modulation of the readout light intensity and phase distribution in the two-dimensional space is achieved effectively.

        • WANG Peng,YANG Chun,WEN Zhao-Jin

          2010,8(3):247-250, Doi:

          Abstract:

          This article introduces a new type of high speed,multi-modulated digital modulator with adjustable center frequency and bit rate features. It can realize the Quadrature Phase Shift Keying(QPSK) and 16QAM(Quadrature Amplitude Modulation) with 80 MHz center frequency and 7.936 5 MHz bandwidth. The general-purpose modulation arithmetic based on software radio,symbol mapping and the realization of pulse shaping filter are discussed. The measuring results demonstrate that the modulation scheme meets the requirements of practicability and general utilization.

        • XU Ping,QING Lin-bo,HE Xiao-hai,YANG Chao,XU Guang-hui

          2010,8(1):67-70, Doi:

          Abstract:

          The implementation of TCP/IP protocol stack on TM320DM642 platform could provide technological support for the application of multimedia embedded systems to networks. Both the function of TM320DM642 chip and the hierarchical structure of LWIP(Light Weight Internet Protocol) were analyzed. Network communications for TM320DM642 systems were implemented by the transplantation of LWIP, not by a solution scheme of NDK(Network Developer’s Kit). Testing examples verified the effectiveness of the LWIP transplanted method.

        • XU Lei,TU Xuecou,WAN Chao,PEI Yufeng,KANG Lin,WU Peiheng

          2015,13(1):27-30, Doi: 10.11805/TKYDA201501.0027

          Abstract:

          A detector can achieve quick response when it is much smaller than the wavelength of the source signal in THz wave band at the expense of signal coupling capability.Therefore, an antenna is applied to collect signals in order to enhance the signal coupling capability of the detector.The properties of antenna determine the frequency response band,the sensitivity and other parameters of the detector directly. A planar-integrated antenna is adopted for signal acquisition in the Nb5N6 microbolometer detector, which is fabricated by lithography,lift-off and other processes of micro-fabrication. The Nb5N6 microbolometer is placed in the center of the planar antenna. Aiming for the center frequency of 0.32 THz, a special capacitive coupling design is proposed to improve the signal coupling capability.

        • ZOU Xiang,QIN Linbo,HE Xiaohai,ZHANG Yuqiang,XU Shunfei

          2015,13(1):111-117, Doi: 10.11805/TKYDA201501.0111

          Abstract:

          The corresponding solutions are proposed to tackle with the disadvantages of conventional oilfield Geographic Information System(GIS), including inconvenience of Client/Server(C/S) mode operation and maintenance, being unable to perform real-time online Point of Interest(POI) rendering, being incapable of segmentation and location according to regions, etc. An oilfield information query system of Browser/Serve(B/S) framework based on AJAX+JSON+HTML5 is designed and implemented. Experimental results show that the POI real-time rendering and regional segmentation improve on their interactivities, and the experiences of users are enriched, which meets the actual requirements of oilfield development. This work has paved the way for the development of diversified network services.

        • ZHANG Hao,YANG Yuhong,XIN Gang,DU Sen

          2015,13(1):142-147, Doi: 10.11805/TKYDA201501.0142

          Abstract:

          The single-channel blind separation of GMSK(Gaussian Minimum Shift Keying) mixing signals is researched. The GMSK mixing signals can not be separated by the Per-Survivor Processing (PSP) algorithm directly, therefore, linear approximation processing of the GMSK signal is considered, which enables GMSK signal to be separated by the PSP algorithm. This algorithm separates the GMSK mixing signals by maximum likelihood estimation in the joint space of the symbol sequential and the channel parameters, reserves the best path and outputs the symbol pairs to get the separated signals. Simulation results show that the bit error rate performance produced by the PSP algorithm on separating the GMSK mixing signals is slightly better than that produced by the particle filtering algorithm; and the complexity of the proposed PSP algorithm is much smaller.

        • LUO Ya,LIAO Qingmin,WANG Desheng

          2015,13(1):35-39, Doi: 10.11805/TKYDA201501.0035

          Abstract:

          A double gate setting with priority of Doppler velocity and the Extended Kalman Filter(EKF) based Multiple Hypothesis Tracking(MHT) algorithm are proposed in order to realize Multiple Targets Tracking(MTT) in High Frequency(HF) ground-wave radar, and to effectively improve the performance of MTT by using the Doppler measurement. In the EKF based MHT, parameters obtained in the EKF are adopted directly to calculate the probability of each hypothesis. A simulation scene is built, and the EKF based MHT algorithm is compared with the one which assumes that the Doppler measurement is independent from the radius measurement. Simulation results show that the double gate setting helps induce number of clutter, and the EKF-based MHT algorithm is better than the other one under dense environments of HF ground-wave radar with stronger track-catching and false-alarm-filtering ability and higher efficiency.

        • MIAO Jiang-hong,MA Guo-ning,HE Yu-dong,YIN Liang

          2010,8(6):647-651, Doi:

          Abstract:

          The design of code tracking loop is a key sector of the realization of noncoherent spectrum spread receiver. In order to realize the code tracking in noncoherent spectrum spread receiver, an energy-normalization digital delay-locked loop was designed, the structure of the loop and the calculating procedure of loop parameters were introduced. The characteristic of noncoherent spectrum spread was analyzed first,and then the key point of the loop design was pointed out. Based on this, the design and realization methods of code loop discriminator, loop filter, early and lag code generator were expatiated. A set of specific loop parameters were introduced as well. Modelsim simulation results and FPGA actual measured data prove the precise code tracking ability of the design.

        • ZHOU Xiao-qing,LI He-sheng,TAO Rong-hui,CAI Ying-wu

          2010,8(2):211-214, Doi:

          Abstract:

          The application of CORDIC(COordinate Rotation DIgital Computing) arithmetic in solving transcendental function has become popular in modern engineering. A brief introduction of CORDIC arithmetic was given in this study. Taking the hyperbolic sine and cosine functions as examples, the method of realizing the arithmetic in FPGA was presented and simulated on ISE(Integrated Software Environment) platform. The result showed this arithmetic was of good precision and instantaneity because of using pipeline. This arithmetic has great practical value in some applications. In addition, a curve of the relationship between the iterative number and the error obtained by the Matlab simulation of the arithmetic can help designers planning the number of iterations for practical applications.

        Quick retrieval of articles
        • LIU Yue,WU Xiao-hong,WANG Zheng-yong,KONG Zi-yang

          2012,12(2):290-294, Doi:

          Abstract:

          A variety of image fusion algorithms are comparatively analyzed in order to solve the apparent seam problem caused by the non-uniform lighting and by the features of the core images themselves. The multi-resolution image fusion algorithm is introduced into the core images stitching. The Laplacian pyramid structure is used in the algorithm, which decomposes the images according to the frequency, and fuses the band-pass images at each frequency respectively. Then the inverse transform is performed to restore the fusion results of the images, and ultimately the seamless stitching of core images is achieved.

          • 1
        • XU Wen,WANG Bin

          2011,11(2):260-265, Doi:

          Abstract:

          Aiming to the problem of automatic modulation classification of the existing digital signal,a classification method based on Kernel Logistic Regression(KLR) is developed.This method is primarily used in economic,medical science and speech process etc,while seldom applied in the field of communication signals. The characteristic parameter of high-order cumulants of the signal is used for training data and testing data.The classification is performed adopting the frequently-used decision tree method. The proposed method is compared to the modulation classification method based on Support Vector Machine(SVM) through simulation experiments. The results indicate that the proposed method is qualified to do the work.Under low SNR(0 dB),the performance of classification is higher than that based on SVM; while under 5dB,the correct recognition rate is above 90% based on KLR.

          • 1
        • ZHANG Shao-ping,YANG Zhong,HUANG Xiao-ning,WU Huai-qun,GU Yuan-zheng

          2010,11(4):609-613, Doi:

          Abstract:

          By analyzing the characteristics of the glass insulator and its defects in aerial images of the unmanned aerial vehicle inspection system, a method is presented to extract glass insulator and detect defects. The OTSU's thresholding method is applied to H and S components in Hue,Saturation,Intensity (HSI) color space for image segmentation; and then, the distribution of the contours' angle and area is calculated by using the histogram method to obtain the position of glass insulators accurately. Feature detection algorithm is proposed to detect the glass insulators and mark out the defects. Experimental results indicate that the method can mark the location of the defects accurately in the aerial images with natural background, which has a good practical value.

          • 1
        • ZHOU Zhi-zeng,LIU Peng,GU Rong-jun

          2010,11(5):736-740, Doi:

          Abstract:

          The relationships between radar detection probability and signal to noise ratio under two environments including free space and the multi-path are analyzed in detail. The radar detection range and the multi-path transmission factors under different reflection coefficients and different carrier frequencies are studied as well. The results show that the smaller the reflection coefficients, the closer the detection probability curves to the curves of the free space; the detection performance declines under high Signal to Noise Ratio(SNR) due to the multipath fading; in order to get the same detection probability, the SNR required in multi-path is lower by 7 dB-8 dB than that in the free space when the SNR is low; the bigger the reflection factors, the bigger the fluctuation of multi-path transmission factors, and the corresponding cracking of exposure zone is more serious.

          • 1
        • ZHENG Rui-rui,WANG Li-xin

          2013,11(5):792-796, Doi:

          Abstract:

          A blind recognition method of cyclic codes is proposed. Under the condition of having known the starting point of the code words,code weight distribution of cyclic codes is analyzed,and code length is recognized based on code weight distribution probability variance. According to the statistical results of code weight distribution, the appropriate code words are chosen,then the common factor of code polynomial after cyclic shift is obtained. Finally, the generated polynomial is recognized by setting a rational judgment relation,thus the blind recognition of cyclic codes is completed. The simulation experiments show that the method has better recognition effect for cyclic codes with BER of 10-2.

          • 1