宽带聚合雷达稀疏频率配置及距离估计
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北京华为数字技术有限公司,北京 100095

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张慧(1987-),女,博士,高级工程师,主要研究方向为雷达信号/数据处理、多源数据融合.email: 123happy.zh @163.com.
马 莎(1977-),女,硕士,高级工程师,主要研究方向为毫米波雷达信号处理、雷达干扰抑制技术.
宋思达(1987-),男,博士,高级工程师,主要研究方向为毫米波雷达信号处理、雷达干扰抑制技术.

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Sparse frequency allocation and range estimation for wideband aggregation radar
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Beijing Huawei Digital Technologies Co.,Ltd.,Beijing 100095,China

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    摘要:

    雷达高距离分辨力需要大带宽发射信号,而雷达发射连续大带宽信号受硬件成本和频谱资源限制。利用多个窄带发射信号进行宽带合成时,由于窄带信号频谱不连续性和步进量的增大,会出现距离旁瓣增大、不模糊距离范围缩小的问题。为解决上述问题,并充分利用不连续或跨波段的频谱资源,提出一种用于宽带聚合的雷达稀疏频率配置方式。通过子频带之间的差分处理,获得等效的连续均匀步进虚拟频率信号,在获得高分辨力的同时避免距离旁瓣增大和距离模糊;对于频率跨度较大的子频带,提出了基于几何绕射理论(GTD)模型的目标散射特性频率一致性校正方法,并仿真分析了不同频率跨度对宽带聚合效果的影响和跨波段宽带聚合的可能性。该研究可进一步为雷达系统的后续兼容研究提供参考。

    Abstract:

    High range resolution of radar requires wideband transmitted signals, but the radar transmission of continuous wideband signal is limited by hardware cost and available spectrum resources. When multiple narrow-band signals are used for wideband aggregation, the range side-lobes will increase and the unambiguity range will decrease as the spectral discontinuity and step size of the narrowband signals increase. In order to solve the above problems, a new sparse frequency configuration is proposed, which can obtain equivalent continuous uniform stepped frequency signals through differential processing between sub-bands. Moreover, to make full use of the discontinuous sub-bands with large frequency span, the influence of frequency spans on target scattering characteristics is analyzed and a frequency consistency correction method based on Geometric Theory of Diffraction(GTD) model is proposed. The effects of different frequency spans on wideband aggregation are simulated and analyzed.The possibility of cross-band wideband aggregation is proved.The research of this paper can provide a reference for the backward compatibility of radar systems.

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张慧,马莎,万蕾,宋思达.宽带聚合雷达稀疏频率配置及距离估计[J].太赫兹科学与电子信息学报,2023,(11):1324~1332

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  • 收稿日期:2021-09-02
  • 最后修改日期:2021-10-19
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  • 在线发布日期: 2023-11-28
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