基于回波数据的机载双天线InSAR运动补偿

基于定位定向系统(position and orientation system,POS)测量数据实现补偿不适用于基线非刚性的系统,因而研究了基于回波数据的干涉相位误差补偿方法——频谱分割方法,分析了干涉相位误差与载机姿态变化造成的斜距误差之间的关系,阐明了算法原理及适用条件.分析了算法的关键参数对补偿精度的影响,提出定量化的选取标准.基于相位误差随距离向变化的模型,改善了算法精度,给出了算法流程.最后利用该算法处理了实际机载双天线InSAR数据,结果表明该方法具有较高的精度,可以在缺乏测量数据的情况下完成干涉相位误差补偿.

Raw data-based motion compensation of airborne dual-antenna InSAR

Usually,the phase error in the airborne dual-antenna InSAR interferograms is compensated using the POS data.However,the relative motion of two antennas can not be measured precisely in the case of non-rigid baseline dual-antenna InSAR system.In such case,a phase compensation method without measurement data is necessary.The raw data-based phase compensation of airborne dual-antenna InSAR interferograms with the spectum slicing method is studied.Based on the in-depth analysis of the relation between interferometric phase errors and motion errors,the principle and applicability of this approach are presented.The influence on the compensation accuracy and the principles of several parameters choices are analyzed.The approach is refined based on the range-variant model,and the flow chart is presented.Finally,the phase compensation result of airborne dual-antenna InSAR using this approach is demonstrateds,which proves that this raw data-based algorithm can proportionably substitute the use of POS data.