机载干涉合成孔径雷达数据处理方法研究

针对机载InSAR的大下视角和高分辨率,干涉图中小阴影区域多,提出了一种幅度非统计滤波和相位统计滤波的联合滤波方法,来提高机栽InSAR干涉相位图的相干性.针对大规模相位图分块相位展开给出了一种图像拼接的代价函数.对机载双天线单航过实测数据的处理结果,证明了滤波方法的有效性.经过滤波之后,相位质量明显改善,分块展开干涉相位图,最后利用代价函数拼接得到机载InSAR实测数据完整的相位展开图.

Data processing method of airborne interferometric synthetic aperture radar

According to the larger incidence angle and the higher spatial resolution of an airborne interferometric synthetic aperture radar(InSAR),the interferogram of an airborne InSAR has excessive small radar shadows.A method that combines non-statistic amplitude filtering and statistic phase filtering to improve the coherence of airborne InSAR interferograms is proposed,and a cost function is given to combine the phase unwrapping blocks for a large interferogram.The processing results of airborne dual-antenna InSAR real data prove the validity of the proposed method.The quality of interferogram is greatly improved.The large scale interferogram is devided into small blocks and unwrapped by using minimum cost network flow,the entire phase unwrapping result is retrieved by combining all the unwrapped phase blocks throught the given cost function.