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本文提出了一种调频连续波SAR改进的频率尺度变换算法。调频连续波SAR在运动过程中持续不断地发射和接收信号,这种运动导致了回波信号的伸缩,对波前重建产生了严重的影响。推导了回波信号模型,给出了信号的距离-多普勒域表达式,分析了由于天线不断运动而导致的相位变化与方位向频率之间的关系。改进的频率尺度变换算法补偿了这种相位变化,实现了目标的精确成像,仿真结果表明了分析的正确性和算法的有效性。
In this paper, we propose an improved frequency scaling algorithm for FM continuous-wave SAR. The FM continuous wave SAR transmits and receives signals constantly during the movement. The movement causes the echo signal to stretch and shrink, which has a serious impact on the wavefront reconstruction. The echo signal model is deduced and the signal distance - Doppler domain expression is given. The relationship between the phase change and the azimuth frequency due to the continuous movement of the antenna is analyzed. The improved frequency scaling algorithm compensates for this phase change and realizes accurate imaging of the target. The simulation results show the correctness of the analysis and the effectiveness of the algorithm.