基于多普勒扩展补偿的FDA-MIMO雷达运动目标检测

张顺生; 刘美慧; 王文钦

doi:10.12000/JR22042

基于多普勒扩展补偿的FDA-MIMO雷达运动目标检测

doi: 10.12000/JR22042

1.
电子科技大学电子科学技术研究院成都 611731
2.
电子科技大学信息与通信工程学院成都 611731

基金项目: 国家自然科学基金(62171092)

详细信息

作者简介:
张顺生(1980-)，男，研究员，博士生导师，主要研究方向为雷达信号处理

刘美慧(1997-)，女，电子科技大学在读硕士研究生，主要研究方向为频控阵雷达运动目标检测

王文钦(1979-)，男，教授，博士生导师，主要研究方向为阵列处理及其在雷达、通信和电子对抗中的应用研究

通讯作者:
张顺生 zhangss@uestc.edu.cn

责任主编：朱圣棋 Corresponding Editor: ZHU Shengqi
中图分类号: TN958
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出版历程
- 收稿日期: 2022-03-09
- 修回日期: 2022-05-25
- 网络出版日期: 2022-06-21
- 刊出日期: 2022-08-28

FDA-MIMO Radar Moving Target Detection Based on Doppler Spread Compensation

1.
Research Institute of Electronic Science and Technology, University of Science and Technology of China, Chengdu 611731, China
2.
School of Information and Communication Engineering, University of Science and Technology of China, Chengdu 611731, China

Funds: The National Natural Science Foundation of China (62171092)

More Information

Corresponding author: ZHANG Shunsheng, zhangss@uestc.edu.cn

摘要

摘要: 频控阵-多输入多输出(FDA-MIMO)雷达在检测运动目标时，由于发射阵元间的频率偏移与目标的速度耦合，因此在慢时间维出现严重的多普勒扩展，进一步造成各接收通道的信号能量无法相干累积，极大降低了系统的检测性能。针对此问题，该文提出一种基于多普勒扩展补偿的FDA-MIMO雷达运动目标检测算法。首先建立了FDA-MIMO雷达运动目标的回波模型，分析了频偏带来的多普勒扩展问题；然后在给出最大似然接收机模型的基础上，提出一种基于插值滤波的重采样算法来补偿FDA-MIMO雷达在检测运动目标时引起的多普勒扩展。仿真结果表明：该文所提算法在抑制多普勒扩展的同时，能够补偿子目标回波在距离维的跨单元走动，实现信号能量的相参累积。
- FDA-MIMO雷达 /
- 运动目标检测 /
- 重采样 /
- 插值滤波 /
- 多普勒扩展
Abstract: When Frequency Diverse Array and Multiple-Input Multiple-Output (FDA-MIMO) radar detects moving targets, the frequency offset between transmitting arrays is coupled with the target velocity, resulting in severe Doppler spread in the slow time dimension. Further, the signal energy of each receiving channel cannot be coherently accumulated, thereby greatly reducing the detection performance of the system. To address this problem, a method of FDA-MIMO radar moving target detection based on Doppler spread compensation is proposed. Firstly, the moving target echo model of FDA-MIMO radar is established, and the Doppler spread caused by the frequency offset is analyzed. After establishing the maximum likelihood receiver model, a resampling method based on an interpolation filter is proposed to compensate for the Doppler spread caused by FDA-MIMO radar during the detection of moving targets. Simulation results reveal that the proposed method can suppress the Doppler spread, compensate for the cross-cell migration of subtarget echo in the range dimension, and realize the coherent accumulation of signal energy.
- FDA-MIMO radar /
- Moving target detection /
- Resampling /
- Interpolation filter /
- Doppler spread

HTML全文

图 1 FDA-MIMO雷达发射接收阵列模型

Figure 1. FDA-MIMO radar transmit and receive array model

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图 2 频控阵-多输入多输出雷达最大似然接收机模型

Figure 2. Maximum likelihood receiver model for FDA-MIMO radar

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图 3 距离走动与多普勒扩展示意图

Figure 3. Schematic diagram of range migration and Doppler spread

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图 4 FDA-MIMO雷达运动目标检测流程图

Figure 4. The flowchart of moving target detection for FDA-MIMO radar

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图 5 接收阵元1的每个通道的多普勒频率中心

Figure 5. The Doppler frequency center of each channel of the first receiving array element

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图 6 接收阵元1的各通道信号在使用所提算法前后的距离-多普勒二维图

Figure 6. The range Doppler two-dimensional graph of each channel signal of the first receiving array element before and after using the algorithm

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图 7 未补偿多普勒扩展下的相干累积结果

Figure 7. Coherent accumulation results with uncompensated Doppler spread

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图 8 补偿多普勒扩展的相干累积结果

Figure 8. Coherent accumulation results with compensated Doppler spread

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图 9 频偏$ \Delta f = 10$ MHz 时，相干处理增益随相干处理间隔的变化曲线

Figure 9. When the frequency offset $ \Delta f = 10 $ MHz, the gain of coherent accumulation varies with the coherent processing interval

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图 10 相干处理间隔为96 ms时，处理增益随频偏的变化曲线

Figure 10. When the coherent processing time is 96 ms, the gain of coherent accumulation varies with frequency offset

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图 11 检测概率曲线图(${P_{{\rm{fa}}}} = 0.001$)

Figure 11. Detection probability graph (${P_{{\rm{fa}}}} = 0.001$)

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