微小型无人机载FMCW SAR宽波束运动补偿算法

doi:10.12305/j.issn.1001-506X.2024.10.08

摘要/Abstract

摘要：

调频连续波(frequency modulated continuous wave, FMCW) 体制的合成孔径雷达(synthetic aperture radar, SAR) 具有较宽的方位向波束, 运动误差在成像处理时会产生较为严重的方位空变性。对此, 建立了具有三轴运动误差的信号模型; 对宽波束情况下的距离和方位的耦合性以及由运动误差导致的方位空变性进行了分析; 在视线向(line of sight, LOS)引入传统的频率分割算法来补偿方位空变误差, 在航向将运动误差建模为包络误差与相位误差; 提出了“逐方位块补偿法”来消除相位误差中的空变性。最后, 通过仿真实验验证了所提算法的有效性。

关键词: 调频连续波, 合成孔径雷达, 方位空变性, 微小型无人机

Abstract:

Synthetic aperture radar (SAR) with frequency modulated continuous wave (FMCW) system has a wide azimuth beam, and the motion error will cause serious azimuth space variance in image processing. In this regard, a signal model with three-axis motion error is established, and the coupling of range and azimuth and the azimuth space variance caused by the motion error in the case of wide beam are analyzed. Then, the traditional frequency-division algorithm is introduced to compensate for the azimuth space variance in the direction of the line of sight (LOS), and the motion error in the along-track is modeled as envelope and phase error, and an "azimuth block-by-block compensation method" is proposed to eliminate the azimuth space variance of the phase error. Finally, the effectiveness of the proposed algorithm is verified by simulation experiments.

Key words: frequency modulated continuous wave (FMCW), synthetic aperture radar (SAR), azimuth space variance, micro-unmanned aerial vehicle

中图分类号:

TN957.52

张法桐, 付耀文, 杨威, 张文鹏, 颜上取. 微小型无人机载FMCW SAR宽波束运动补偿算法[J]. 系统工程与电子技术, 2024, 46(10): 3303-3311.

Fatong ZHANG, Yaowen FU, Wei YANG, Wenpeng ZHANG, Shangqu YAN. Wide-beam motion compensation algorithm for micro-UAV FMCW SAR[J]. Systems Engineering and Electronics, 2024, 46(10): 3303-3311.

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参数	数值
中心频率/GHz	77
信号带宽/GHz	1
脉冲重复周期/ms	0.23
飞行速度/(m/s)	15
飞行高度/m	30
俯视角/(°)	20
波束宽度/(°)	30
合成孔径长度/m	18.76
条带长度/m	12

误差类型	补偿方法	熵值
LOS	两步补偿法	7.061 5
LOS	FD及两步补偿法	6.409 9
航向	两步补偿法	7.283 3
航向	逐方位块补偿法	6.345 7

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