CAJ | 학술논문

合成孔径雷达的回波数据和图像数据都是复数,由于各个分辨单元散射点的初始相位是随机的,致使连续变化地物场景的信号带宽较大,传统的单天线SAR很难实现空间稀疏降采样.该文采用交轨向多天线观测结构,分析了交轨向稀疏阵列SAR的成像模型,首次提出利用信号重构方法,去除散射点随机初相位,降低复信号带宽,以较大间隔的空间稀疏采样实现稀疏阵列SAR侧视3维成像.干涉SAR 2维成像实际数据处理结果验证了通过信号重构可以降低复信号带宽,稀疏阵列SAR侧视3维成像的仿真结果验证了该文方法的有效性.
합성공경뢰체적회파수거화도상수거도시복수,유우각개분변단원산사점적초시상위시수궤적,치사련속변화지물장경적신호대관교대,전통적단천선SAR흔난실현공간희소강채양.해문채용교궤향다천선관측결구,분석료교궤향희소진렬SAR적성상모형,수차제출이용신호중구방법,거제산사점수궤초상위,강저복신호대관,이교대간격적공간희소채양실현희소진렬SAR측시3유성상.간섭SAR 2유성상실제수거처리결과험증료통과신호중구가이강저복신호대관,희소진렬SAR측시3유성상적방진결과험증료해문방법적유효성.
@@@@The raw data of Synthetic Aperture Radar (SAR) is complex value, as well as the image data. Due to the random phase of each scattering cell, continuous scene has a wide signal band which makes single-aperture SAR difficult to realize down-sampling. In this paper, imaging model of cross-track sparse array SAR is analyzed. Signal reconstruction based imaging method under cross-track multi-aperture structure is investigated to eliminate random phases of scatters and reduce the signal bandwidth. Consequently, sparse array side-looking 3D imaging with larger interval space sampling is realized. The results on InSAR 2D real data verify that the bandwidth can be reduced after signal reconstruction. Besides, the simulation experiments on 3D imaging validate the effectiveness of the proposed method.