基于Stretch处理的ISAR成像补偿新方法

针对Stretch体制的ISAR成像处理中本振信号延时误差的补偿问题,提出了基于延时量补偿的运动补偿方法。该算法先将每次回波的时间基准补偿到相同位置,用以消除时间量化误差的影响,再利用包络对齐和相位聚焦,用以补偿本振信号延时误差。同传统算法相比,该算法不受时间量化误差的影响,能够精确补偿本振信号延时误差。通过仿真实验证明了该算法的有效性。

New compensation method of Stretch signal in ISAR imaging

For the compensation of the local oscillator's delay error,in the ISAR imaging working with the Stretch system,the motion compensation method based on time delay error compensation is proposed.Firstly,the time reference of the each echo must be compensated to the same position,in order to eliminate the effect of the time quantization error.Secondly,the envelope alignment and the phase focusing are imposed to composed to compensate the local oscillator's delay error.Comparing with the convertional algorithms,the algorithm proposed is independent with the effect of the time quantization error,and it can make the precise compensation for the local oscillator's delay error.The simulation prove the effectiveness of the algorithm.