A Moving Target Imaging Approach for the Multichannel in Azimuth High Resolution Wide Swath SAR System
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摘要:
在方位多通道SAR系统中，由于运动目标的回波特性和静止目标的不同，传统的重构滤波器组方法对运动目标的重建是无效的。该文提出一种方位多通道SAR运动目标信号重构方法。该方法首先分析了方位多通道SAR系统中运动目标回波特性，并与静止目标回波形式进行对比，给出了传统重构方法失效的主要原因；通过引入运动目标的径向速度参数，有效实现了匀速运动目标的频谱重构，较好地抑制了方位多通道SAR系统中匀速运动目标的方位模糊。星载仿真实验结果验证了该重构方法的有效性。
Abstract:Since the echo characteristics of moving targets are different from that of stationary targets, the traditional reconstruction filter bank algorithm, i.e., the reconstruction filter algorithm, is not applicable. In this paper, a novel reconstruction approach of the moving target for a multichannel in azimuth High-Resolution Wide-Swath (HRWS) Synthetic Aperture Radar (SAR) system is proposed. The approach firstly analyzes the echo characteristics of the moving target for the multi-channel in azimuth SAR system and gives the main reason for the failure of the traditional reconstruction method in contrast to the form of the stationary target echo. By introducing the radial velocity of the moving target, the spectrum reconstruction of the uniform moving target is effectively realized, and the azimuth ambiguities of the uniform moving target for the multi-channel in azimuth SAR system is well suppressed. Space-borne simulated results confirm the effectiveness of the proposed reconstruction approach.
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表 1 方位多通道星载SAR系统仿真参数
参数 取值 场景中心斜距 890 km 卫星速度 7474.8 m/s 多普勒带宽 3737.4 Hz 载频 9.65 GHz 理想PRF 1495 Hz 实际PRF 1600 Hz 目标速度 5 m/s 
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