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本文研究多孔径合成孔径雷达(SAR)通道间的失配问题,提出了一种在两个SAR原始数据域进行两步滤波的通道均衡方法。针对天线波束方向图差异进行距离多普勒域上的幅相滤波,在距离频域方位时域进行的幅相滤波针对的是频率响应差异。在第一步滤波中,为消除通道间的确定性差异,对高相干性区域构造一个自适应滤波器,对噪声区域则采用非自适应滤波。经过第二步滤波后,噪声被滤除,剩余就是运动目标信号。机载实测数据处理验证了原始数据域通道均衡方法的可行性。
In this paper, we study the mismatch between multi-aperture Synthetic Aperture Radar (SAR) channels and propose a channel equalization method with two-step filtering in the two SAR raw data domains. The amplitude and phase filtering on the Doppler range is carried out for the difference of the antenna beam pattern. The amplitude and phase filtering in the time domain of the range and frequency domain is aimed at the frequency response difference. In the first step of filtering, an adaptive filter is constructed for the high coherence region and a non-adaptive filter is used for the noise region to eliminate the deterministic difference between the channels. After the second step of filtering, the noise is filtered out and the rest is the moving target signal. Airborne measured data processing verified the feasibility of the original data domain channel equalization method.