基于极化散射特性的空间锥体目标宽带回波对齐

Polarization Scattering Characteristics Based Range Alignment for Bandwidth Echoes of Space Coning Target

包络对齐是宽带回波预处理中重要的一部分,然而对于空间锥体这类只有较少散射中心且目标存在微动的情况,现有的包络对齐方法并不能得到较好的对齐结果。对于一些利用宽带回波进行微动目标参数估计的算法,包络对齐是其算法的关键一步。该文提出一种基于极化散射特性进行包络对齐的算法,算法首先利用极化谱估计与幅相联合估计(P-CAPES)超分辨方法估计宽带极化回波中的散射中心的数目、位置和极化散射矩阵,然后计算前后时刻回波散射中心的极化相似性参数,最后利用得到相似性参数进行包络对齐。基于电磁计算数据的实验结果验证了算法的有效性。

Range alignment is an important step in the preprocessing of wideband radar echoes. However for the echoes of space coning target with micro-motions that only has several scatter centers, the range alignment methods available do not work well. Range alignment is the key step in the parameters estimation algorithms for wideband radar echoes of targets with micro-motions. This paper proposes a range alignment method based on the polarization scattering characteristics. The proposed method first estimates the number, locations and polarization scattering matrices of the scatter centers in the wideband radar echoes using the combing Pole Capon and Amplitude and Phase EStimation（P-CAPES） super-resolution method. Then, polarization similarities of the scatter centers in the adjacent echoes are calculated with the polarization scattering matrices and are used to range alignment. Experiments verify the effectiveness of the proposed method by using electromagnetic data.