基于局部搜索的机载外辐射源干扰抑制算法

邓亚琦; 张赛文; 李稳国; 肖卫初

doi:10.12265/j.cjors.2021308

基于局部搜索的机载外辐射源干扰抑制算法

doi: 10.12265/j.cjors.2021308

1.
湖南城市学院信息与电子工程学院全固态储能材料与器件湖南省重点实验室, 益阳 413000
2.
湖南大学电气与信息工程学院, 长沙 410000

基金项目: 湖南省自然科学基金青年基金(2021JJ40029)；湖南省教育厅科学研究项目青年项目(21B0710)

详细信息

作者简介:
邓亚琦：(1991—)，女，湖南人，博士，主要研究方向为机载外辐射源雷达信号处理、空时自适应处理

张赛文：(1988—)，男，湖南人，博士，主要研究方向为稀疏信号处理、超分辨显微成像

李稳国：(1977—)，男，湖南人，博士，主要研究方向为电网优化与控制

通讯作者:
邓亚琦 E-mail: dengyaqi@hncu.edu.cn

中图分类号: TN958.97
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- 文章访问数: 44
- HTML全文浏览量: 14
- PDF下载量: 14
- 被引次数: 0
出版历程
- 收稿日期: 2021-11-18
- 录用日期: 2022-05-18
- 网络出版日期: 2022-05-18

Interference suppression algorithm based on local search in airborne passive radar

1.
College of Information and Electronic Engineering, All-Solid-State Energy Storage Materials and Devices Key Laboratory of Hunan Province, Hunan City University, Yiyang 413000, China
2.
College of Electrical and Information Engineering, Hunan University, Changsha 410000, China

摘要

摘要: 在机载外辐射源雷达不纯净参考信号条件下，参考通道中的多径与回波匹配得到的干扰将降低空时自适应处理的目标检测能力，而网格失配问题严重影响了干扰的估计性能. 本文针对网格失配下的机载外辐射源干扰抑制问题，提出一种基于局部搜索的干扰估计算法. 该算法在干扰稀疏观测模型的基础上构建全局距离-多普勒字典，从中选择与干扰相匹配的全局网格点；然后以该全局网格点为中心，对多普勒平面精细划分来构建局部多普勒字典，并选择与干扰更匹配的局部网格点；最后估计干扰的距离-多普勒像以实现干扰抑制，克服不纯净参考信号的影响. 仿真结果表明，所提算法可降低网格失配导致的抑制性能损失，有效提高不纯净参考信号下空时处理的目标检测能力.
- 机载雷达 /
- 外辐射源雷达 /
- 不纯净参考信号 /
- 网格失配 /
- 局部搜索
Abstract: Considering an impure reference signal in airborne passive radar systems, the interference, which is the matched result of scatterer echoes with multipath in the reference channel, degrades the target detection ability of space-time adaptive processing. In addition, the off-grid effects seriously affect the interference estimation performance. Aiming at the interference suppression problem in airborne passive radar with off-grids effects, an interference suppression method based on local search is proposed in this paper. The algorithm builds a global range-Doppler dictionary based on the interference sparse measurement model, from which a global grid point matching the interference is selected. Then, the global grid point is used as the center to finely divide the Doppler plane and construct a local Doppler dictionary, and the local grid point that is more suitable for the interference is selected. Finally, the range-Doppler image of the interference is estimated to achieve interference suppression and overcome the influence of impure reference signals on the STAP algorithm. The simulation results show that the proposed algorithm can reduce the loss of suppression performance caused by off-grid effects and improve the target detection ability of space-time adaptive processing with impure reference signals.
- airborne radar /
- passive radar /
- impure reference signals /
- off-grid /
- local search

HTML全文

图 1 机载外辐射源雷达系统几何关系图

Fig. 1 Bistatic geometry of airborne passive radar

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图 2 局部多普勒字典示意图

Fig. 2 Illustration of local Doppler dictionary

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图 3 平均改善因子性能随迭代次数的变化

Fig. 3 Average improved factor performance against the iteration number

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图 4 不同算法挑选出的原子位置分布

Fig. 4 Location distribution of selected atoms for different algorithms

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图 5 不同算法的改善因子性能

Fig. 5 Improved factor performance of different algorithms

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图 6 不同算法的目标检测结果

Fig. 6 Target detection result of different algorithms

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图 7 不同算法的改善因子性能随多径个数的变化

Fig. 7 Average improved factor performance of different algorithms against the number of multipath signals

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参考文献(17)

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