To solve the problem of left-right Doppler ambiguity in forward-looking Synthetic Aperture Radar(SAR)imaging,Forward-Looking Multi-Channel SAR(FLMC-SAR)can achieve Doppler ambiguity resolving imaging through beamforming.However,array deviation angle and time-varying platform attitude errors lead to the mismatch between the space and time characteristics of a target,which affects the Doppler ambiguity resolving imaging performance.This study proposes an FLMC-SAR imaging and array attitude error compensation method.First,the three-dimensional FLMC-SAR array deviation-angle error and time-varying platform attitude error models are established.The mechanism of matching the spatiotemporal characteristics of targets in the two-dimensional spatiotemporal spectrum plane is analyzed.In addition,a representation model is established to study the spatiotemporal characteristics mismatch caused by the array attitude error in the spatiotemporal plane.Thereafter,based on the non-left-right spatial variation of the error,we propose a method of adding an error compensation phase to the back projection function to uniformly compensate the array attitude error of left-right symmetric targets.The results of simulation experiments show that the proposed method can achieve FLMC-SAR array attitude correction and error compensation,enhance the performance of forward-looking Doppler ambiguity suppression,and ensure the azimuth resolution performance of forward-looking imaging.
万方数据
维普
