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双基星载高分辨率宽测绘带合成孔径雷达系统(HRWS-SAR)的方位向信号普遍为非均匀采样,重构其均匀采样信号或多普勒频谱是成像处理的关键步骤。文中将方位照射时间内时变的发射接收距离比近似为常数,利用双基系统与单基系统方位向通道间传递函数的等效关系,建立了一般双基构型星载HRWS-SAR系统的方位向信号模型,构建了方位向信号重构的最小二乘算法,利用传递函数矩阵的Vandermonde矩阵表示有效降低算法复杂度,并给出了重构性能指标信噪比缩放因子及方位模糊比的计算公式。文中对几种典型双基构型的星载HRWS-SAR系统进行方位向信号重构仿真,结果表明最小二乘算法能较高性能的重构出方位向信号的多普勒频谱。
The azimuth signals of HRWS-SAR are generally non-uniform sampling. Reconstructing the uniformly sampled signal or Doppler spectrum is the key step of imaging processing. In this paper, the time-varying transmitting-receiving distance ratio in the azimuth irradiation time is approximately constant. Based on the equivalent relation between the transfer functions of the bi-based systems and the azimuths of the monostatic system, the general structure of the satellite-borne HRWS-SAR system The azimuth signal model is used to construct the least square algorithm of azimuth signal reconstruction. The Vandermonde matrix representation of the transfer function matrix is used to reduce the complexity of the algorithm effectively. The signal to noise ratio scaling factor and azimuth fuzzy ratio Calculation formula. In this paper, several typical bistatic HRWS-SAR systems are simulated with azimuth reconstruction. The results show that the least square method can reconstruct the Doppler spectrum of the azimuth signal with high performance.