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针对如何实现星载合成孔径雷达(SAR,Synthetic Aperture Radar)超宽测绘带的问题,对多通道星载SAR扫描模式开展研究.在分析该模式特点的基础上提出了实现超宽测绘带的方法,并推导了多通道扫描模式成像处理算法(MCECS,Multiple Channels ExtendedChirp Scaling).该算法利用内定标数据校正通道间的幅相不一致性,通过滤波方法完成了方位向非均匀采样信号的重构.在采用修正的天线长度进行“扇贝效应”校正以及精确聚焦处理后,通过求解四次方程的方法对图像进行快速地理编码,并完成图像的拼接.最后利用计算机仿真验证了算法的有效性.
Aiming at the problem of how to realize the ultra wideband SAR of Synthetic Aperture Radar (SAR), the multi-channel spaceborne SAR scanning mode is studied.On the basis of analyzing the characteristics of this mode, (MCECS, Multiple Channels Extended Chirp Scaling) is derived.The internal calibration data is used to correct the amplitude and phase inconsistency between channels, and the reconstruction of the azimuth non-uniform sampling signal is completed by the filtering method. After the correction of the “scallop effect” and the precise focusing process, the four-equation method is used to quickly geocode the image and finish the image splicing. Finally, the effectiveness of the algorithm is verified by computer simulation .