基于相位估计的InSAR信号优化处理

InSAR Signal Optimal Processing Based on Phase Estimation

基于最大似然估计理论,对干涉合成孔径雷达(InSAR)系统中目标回波的确定性信号模型进行了优化处理。首先,介绍了一种地表测绘高度计算的InSAR模型,给出了目标回波信号中相位估计的和通道与差通道处理模式;接着,对回波相位估计算法的极限误差进行计算,得出地表目标回波的波达角(DOA)估计的渐进误差;然后,根据探测目标回波相位及DOA优化估计信息,给出地表目标高度计算的渐进势精度公式;最后,对目标双通道回波信号进行了仿真,利用3种算法进行了仿真和对比,验证了算法的可靠性和精确性。

Based on the maximum likelihood estimate theory,the optimal processing of the deterministic signal model of target echo in the interferential synthetic aperture radars(InSAR)system is analyzed.Firstly,a InSAR model for calculating suface elevation is introduced,and the processing modes of sum and difference channel of phase estimation in target echo signal are given.Then,the limit error of the phase estimation algotithm is calculated to obtain the progressive error of the direction of array(DOA)estimation of the surface target echo.And then,based on the echo phase and DOA optimization information of the detected target,the progressive potential precision formula of the surface height calculation is given.Finally,the target dual-channel echo signals are simulated,and three algorithms are simulated and compared to verify the reliability and accuracy of the algorithm.