地基SAR差分干涉测量大气扰动误差校正

摘要

Atmospheric disturbance effect is one of the major factors which influence the measurement precision of ground-based synthetic aperture radar system. In this paper, an atmospheric disturbance correction algorithm based on corner reflector is proposed. The atmospheric disturbance effect is analyzed according to interferometric phase change of the corner reflector, and then the error is corrected. In order to testify the capability of the algorithm, we made an experiment of GB-SAR interferometric measurement of trihedral corner reflector displacement with atmospheric disturbance correction, and then compared the corrected result with the compensation algorithm based on meteorological parameter. Experimental results demonstrates that the correction algorithm based on corner reflector is reliable and precise.%在地基SAR(GB- SAR)差分干涉测量中,大气扰动影响是其测量精度误差的重要来源.提出了一种基于角反射器的地基SAR差分干涉测量大气扰动误差校正方法；该方法利用角反射器作为稳定控制点,根据其干涉相位的变化情况来分析观测区域大气扰动影响,从而实现对其扰动误差的校正.为了检验该校正方法的实用性,进行了三面角反射器外场形变测量中大气扰动误差校正实验,并将其校正结果与基于气象参数补偿法的校正结果进行了对比.结果表明,该校正方法具有很好的可靠性和精确性.