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      Volume , No. 2 | 2024
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      • YE Hang,WANG Yongliang,LIU Weijian,LIU Jun,CHEN Hui

        2024(2):105-113, DOI: 10.11805/TKYDA2022166

        Abstract:

        To solve the problem of adaptive detection for distributed targets in partially homogeneous environment with outliers and limited samples, a class of adaptive detectors are designed based on geometric median in this paper. The first step is to construct a data selector based on geometric median generalized inner product and eliminate sample data containing outliers. The second step is to construct detection statistics of the generalized adaptive subspace detector using covariance matrix estimators, which are based on geometric median. The detectors utilize geometric median of the positive definite matrix space without any knowledge of prior probability distribution of sample data. The performance of the proposed two-step detectors is evaluated in terms of the probabilities of correct outliers excision, false alarm, and detection. Experiment results based on simulated and real data show that the proposed approach has better detection performance than the existing ones based on traditional covariance estimator.

      • MENG Xiangqi,WANG Xinghai,XUE Wei,CHEN Xiaolong

        2024(2):114-121, DOI: 10.11805/TKYDA2024027

        Abstract:

        To investigate the application of RF system level chip—Radio Frequency System-on-Chip(RFSoC) in pulse radar system, a radar ranging system with high performance digital-analog hybrid signal processing capability is designed. The high-performance RFSoC development board—IW-RFSoC-49DR(including the design of the background interference filtering algorithm) is adopted, and the test environment is set in a laboratory with narrow space and disturbed multimetallic equipments. The results of the experiments show that the experimental data are significantly disturbed in an untreated, complex indoor environment; after implementing the background interference filtering algorithm, the display resolution of the frequency spectrum map has been significantly improved. As the test target distance increases from 3 m to 12 m, the ranging error decreases from 53 cm to 5 cm. RFSoC technology shows significant advantages in the design of pulsed radar system, realizing the high integration and low power consumption design, and laying a foundation for the subsequent design of portable radar based on RFSoC.

      • FU Xiongtao,YI Jianxin,WAN Xianrong,XU Baoxiong

        2024(2):122-131, DOI: 10.11805/TKYDA2023061

        Abstract:

        The tracking accuracy of conventional Adaptive Interactive Multiple Model(AIMM) algorithm is poor in the process of maneuvering target tracking by passive radar. In combination with the characteristics of passive radar,the improved Adaptive Transition Probability Matrix-Interactive Multiple Model(ATPM-IMM) algorithm is proposed. Based on the ATPM-IMM algorithm, this algorithm uses the adaptive control window to revise the transition probability matrix again. It can automatically switch the maneuvering model according to the maneuvering situation of the target and improve the matching probability of real model. Simulation and experimental results show that the proposed algorithm can effectively improve the tracking accuracy of passive radar to maneuvering targets.

      • LU Yuan,SONG Jie,XIONG Wei,CHEN Xiaolong

        2024(2):132-141, DOI: 10.11805/TKYDA2023170

        Abstract:

        Non-cooperative bistatic radar has a low signal-to-noise ratio in the echo due to its special detection method. In particular, the detection between frames in the radar scanning cycle for maritime moving targets is not stable, which will bring great difficulties for subsequent target tracking. The low threshold Constant False Alarm Rate(CFAR) detector is employed to match the detection results of radar range-Doppler dimension and range-azimuth dimension to obtain the corresponding mask map, and the potential moving targets are found. Then, a Double Backbone-YOLO(DB-YOLO) that fuses multi-dimensional feature information is proposed. The network adopts a dual-trunk structure, extracts the features of the moving target mask map and the same-scale P-display map under its mapping, and uses a deep separable convolution module to reduce the model parameters of the network. Finally, the comparison experiments with Faster RCNN, YOLOv5 and its common variant YOLOv5-ConvNeXt show that DB-YOLO effectively improves the target detection performance and ensures the inference speed, which lays a foundation for target tracking of noncooperative bistatic radar.

      • DUAN Kexin,YAN Wenjun,LIU Kai,ZHANG Jianting,LI Chunlei,WANG Yihui

        2024(2):142-151, DOI: 10.11805/TKYDA2023181

        Abstract:

        To tackle with the problem of decreased recognition accuracy caused by imbalanced individual data distribution in Specific Emitter Identification(SEI), a dynamic weight model based methodis proposed for individual identification of radiation sources. A Dynamic Class Weight(DCW) model is built. A moderate initial weight value is obtained by using a meta learning algorithm through two-layer calculation with a small amount of sample data. Then, a new cost sensitive loss function is designed to calculate the backward adjustment of the distance between the predicted value and the true value, which gives the minority learning weight, and moderately increases the attention to the minority data. It is more friendly to the minority. It has obvious advantages in the processing of highly unbalanced data, which alleviates the calculation misleading of the majority of samples in the whole recognition process, thus improving the overall recognition accuracy.

      • SHEN Jiawei,YI Jianxin,WAN Xianrong,CHENG Feng

        2024(2):152-159, DOI: 10.11805/TKYDA2023059

        Abstract:

        The background noise in the echo spectrum of High Frequency Surface Wave Radar(HFSWR) is complex, the clutter accounts for a small proportion and the ionospheric clutter has different forms and positions, therefore, it is difficult to automatically recognize the clutters. Based on DeeplabV3+ deep learning algorithm, an automatic identification method of ionospheric clutter and sea clutter is proposed for HFSWR. Selecting the lightweight MobileNetV2 backbone feature network, adding the channel attention mechanism module SENet, the focused learning of clutter labels is realized, and the loss weight of various labels in the training set is optimized. The model pre-training transfer method is employed to pre-train the network to tackle with the problem of too small sample space. The experimental results on the measured data set show that the proposed method can realize the automatic recognition of ionospheric clutter and sea clutter in HFSWR, and can obtain more accurate and finer clutter recognition results than the original DeeplabV3+ algorithm. The mean Intersection over Union(mIoU) and Accuracy(ACC) of sea clutter recognition results are increased by 2.9% and 5.1% respectively, and the mIoU and ACC of ionospheric clutter recognition results are increased by 3.0% and 4.9% respectively.

      • CHEN Yaxuan,KONG Ruru,LI Zhaoying,SUN Tong,XIONG Fan,SUN Yun,LIU Yongshan,ZHANG Youguang,BAI Zhongyang,WEN Lianggong

        2024(2):160-167, DOI: 10.11805/TKYDA2022249

        Abstract:

        The sensing and detection of the biomolecule Terahertz(THz) spectrum fingerprint is performed based on Complementary Metal Oxide Semiconductor(CMOS) controllable metamaterials, using a Spintronic THz Emitter device. The spintronic THz spectrum fingerprint of three different biological samples were benchmarked with results using THz photoconductive antennas. The results show that the feasibility of measuring biological samples with spin terahertz source is verified. At the same time, a frequency based biomolecular THz sensing scheme is proposed by utilizing CMOS controllable metamaterials. Finite element models are built based on the performance test and the biosensing process of the CMOS controllable metamaterial devices. Five CMOS controllable metamaterials were designed with center frequencies related to the absorption peaks of the biomolecules under test. The simulation results show that the resonance frequency has a red shift with the increase of voltage, and the maximum red shift is up to 40 GHz. This paper provides experimental and theoretical foundations for building miniaturized and integrated biomolecular THz sensing systems.

      • TANG Jingchao,JIANG Wanshun,DENG Jianqin,ZHU Weifeng,SHI Xianbao,JIA Dinghong,WANG Mo,ZHANG Shengzhou,LIANG Xiaolin,SONG Qing'e

        2024(2):168-175, DOI: 10.11805/TKYDA2023136

        Abstract:

        Microwave, millimeter wave and terahertz noise sources are mainly employed to generate noise signals, and they are the core components of noise figure measurement system. This paper has summarized the development of noise sources at home and abroad in recent years. The exiting noise sources are divided into five categories: based on digital and analog circuit technologies, based on semiconductor diode technology, based on field effect transistor technology, based on black body and heater circuit technologies, based on photoelectric fusion technology. The main technical characteristics of these five types of noise sources are analyzed. The research status of different noise sources are compared, and the application prospects and development trends are outlined.

      • SUN Lijun,LI Mingjun,WEI Neng,LI Chun,LIU Xiaoming

        2024(2):176-180, DOI: 10.11805/TKYDA2022038

        Abstract:

        Frequency Selective Surface(FSS) has been widely used in many multi-channel receiving systems, where large angle incidence and multi-polarization receiving are required in many cases. A frequency selective surface is designed using a cross-dipole combined with a square patch to transmit (55±5) GHz and reflect (33±5) GHz signals. The signal for (55±5) GHz is in perpendicular polarization, and for (33±5) GHz it is in parallel polarization. The prototype is fabricated using Printed Circuit Board(PCB) technology and measured by free space method. It is demonstrated that good agreement with simulation is obtained.

      • LI Xiangqin,XIE Zhenchao,YU Yu,LI Beibei,WU Tao,QIAN Zhipeng

        2024(2):181-185, DOI: 10.11805/TKYDA2022026

        Abstract:

        The geostationary orbit microwave radiometer antenna is composed of three large diameter reflectors. The orbit heat flow is complex. The reflector and its supporting structure will undergo large-scale deformation due to severe temperature changes. This leads to a decrease in the efficiency of the main beam and a deviation of the beam pointing. The single-freedom tolerance analysis of the antenna reflector is carried out. Based on the fully automatic multi-freedom tolerance analysis system, the relationship between antenna mechanical error and electrical performance is obtained. And the correctness of the tolerance value of each freedom is verified based on the Monte Carlo tolerance analysis method. Finally, the near-field test system is employed to test the main beam efficiency and beam pointing under the antenna tolerance state. Comparing and analyzing the measured tolerance value with the semi-physical simulation value and design value verifies the correctness of the tolerance analysis.

      • GUO Muxin,JIANG Ge,HUANG Bo,JING Wen

        2024(2):186-193, DOI: 10.11805/TKYDA2022023

        Abstract:

        Conventional radar altimetry parameter estimation algorithms often suffer from overfitting due to the high dimensionality of the parameters to be estimated. To this end, a novel Proximal Hamiltonian Monte Carlo(PHMC) algorithm is proposed to estimate the elevation parameters in a statistical way. More specifically, Laplace distribution is employed to characterize the sparse prior to achieve the confidence estimation for the elevation parameters. This prior can depict the terrain scenes with abrupt elevation changes. However, due to the non-conjugation between the sparse prior and Gaussian likelihood function, the hierarchical Bayesian is employed to obtain the closed-form solution of posterior distribution function. To overcome the difficulty of the Bayesian inference of high-dimensional posterior, the Hamiltonian Monte Carlo(HMC) is utilized to solve the parameter estimation problem in fully Bayesian inference. Since the potential energy obtained by posterior distribution does not satisfy the differentiable requirement of HMC, the proximal operator is applied to provide the sub-gradient to estimate parameters. Comparisons with the results using synthesis and practical data have demonstrated the superiority of the proposed PHMC over other conventional algorithms.

      • TANG Mingyang,WU Yafeng,LI Jin

        2024(2):194-200, DOI: 10.11805/TKYDA2021426

        Abstract:

        A Blind Source Separation(BSS) algorithm based on Empirical Mode Decomposition-Non-Linear Principal Component Analysis(EMD-NLPCA) is proposed after studying the BSS algorithm for underdetermined non-linear mixed signals. Firstly, EMD is applied to the observed signal, then high-order statistics are introduced after reconstructing the signal. The principal component analysis is carried out to complete the signal separation. This algorithm can not only deal with the undetermined environment but also solve the problem of non-linear mixing. In the simulation, the results of the algorithm are compared with those of the sparse component analysis, which proves that the proposed algorithm is correct and more universal than the sparse component analysis. Finally, the algorithm is applied to the separation of driving audio signals of unmanned aerial vehicle engines, and it works well.

      • ZHU Caiqiu,LIU Qinghua,LU Jinchun,JIN Liangnian

        2024(2):201-208, DOI: 10.11805/TKYDA2021434

        Abstract:

        Detecting and locating buried objects from complex and diverse Ground Penetrating Radar(GPR) imaging is labor-intensive and time intensive. A method based on deep learning is proposed. The quantitative analysis on arbitrary targets is performed by using the Fully Convolutional One-Stage(FCOS) object detection algorithm. The target area is tracked and labeled with clustering tags. The precise location of underground target is obtained by the curve fitting. The information is reconstructed for the buried underground target. The simulation results show that this method avoids the complex calculation required by the traditional processing algorithm, and can quickly detect the target. The position and dielectric properties of the target are estimated with high precision, and the positioning error in depth is below 3 cm. Therefore, this method effectively realizes the reconstruction of the position, depth and size of the target in the underground scene.

      • WU Nan,SUN Yu,WANG Xudong

        2024(2):209-218, DOI: 10.11805/TKYDA2021436

        Abstract:

        Although modulation classification based on deep neural network can achieve high Modulation Classification(MC) accuracies, catastrophic forgetting will occur when the neural network model continues to learn new tasks. In this paper, we simulate the dynamic wireless communication environment and focus on breaking the learning paradigm of isolated automatic MC. We innovate a research algorithm for continuous automatic MC. Firstly, a memory for storing representative old task modulation signals is built, which is employed to limit the gradient update direction of new tasks in the continuous learning stage to ensure that the loss of old tasks is also in a downward trend. Secondly, in order to better simulate the dynamic wireless communication environment, we employ the mini-batch gradient algorithm which is more suitable for continuous learning. Finally, the signal in the memory can be replayed to further strengthen the characteristics of the old task signal in the model. Simulation results verify the effectiveness of the method.

      • YANG Yuan,ZOU Zuwei

        2024(2):219-226, DOI: 10.11805/TKYDA2022022

        Abstract:

        Single Event Upset(SEU) effects are a common cause of processor failures in aerospace environments, necessitating effective protective designs to enhance the reliability of high-altitude equipment in the fields of aviation and astronautics. Traditional embedded reliability protection designs typically employ either single hardware or software approaches: implementing Triple Modular Redundancy(TMR) through software requires substantial CPU resources; employing hardware circuits does not facilitate error reporting.This paper focuses on the PPC460 processor as the target system, discussing an advanced reliability enhancement design method utilizing Field-Programmable Gate Array(FPGA) technology for the PPC460 processor. The approach integrates an extended Hamming code encoding and decoding algorithm, parity checking, and Triple Modular Redundancy techniques. By synergistically combining software and hardware strategies, it improves the correctness of data within the storage space, reduces CPU resource consumption, and effectively realizes high-security, high-reliability, and interference-resistant protection for critical data on the PPC460 processor in special complex environments.

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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).

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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.

        • 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.

        • 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 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.

        • 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.

        • 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.

        • 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.

        • 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.

        • 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.

        • 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.

        • 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.

        • 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.

        • 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.

        • 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.

        • 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.