CAJ | 학술논문

高度-速率维成像时,差分干涉层析成像合成孔径雷达获取的观测数据在基线-时间平面非均匀分布.若直接对观测数据进行两维傅里叶变换来恢复散射体高度-速率维像,则因强副瓣存在,成像效果不理想.该文将差分干涉层析成像合成孔径雷达高度-速率维成像问题归结为2维积分方程的逆问题,提出了一种采用Backus-Gilbert算法实现差分干涉SAR层析成像的新方法,并使用Tikhonov正则化获得逆问题的正则解.仿真结果表明该文提出的方法能够克服基线时间不均匀造成的影响,获得较好的成像结果.
고도-속솔유성상시,차분간섭층석성상합성공경뢰체획취적관측수거재기선-시간평면비균균분포.약직접대관측수거진행량유부리협변환래회복산사체고도-속솔유상,칙인강부판존재,성상효과불이상.해문장차분간섭층석성상합성공경뢰체고도-속솔유성상문제귀결위2유적분방정적역문제,제출료일충채용Backus-Gilbert산법실현차분간섭SAR층석성상적신방법,병사용Tikhonov정칙화획득역문제적정칙해.방진결과표명해문제출적방법능구극복기선시간불균균조성적영향,획득교호적성상결과.
When reconstructing elevation-velocity image, the observation data obtained from differential SAR tomography in baseline-time plane does not follow uniform distribution. If the elevation-velocity image of multiple scatterers is obtained using two-dimensional FFT method, the imaging result is not very good because of high sidelobes. In this paper, a new differential SAR tomography imaging algorithm is proposed based on Backus- Gilbert technique. In this algorithm, the elevation-velocity imaging is converted into an inverse problem of two- dimensional integral function, and Tikhonov regularization is used to get the regularized solution of the inverse problem. Simulation results show that the proposed algorithm can overcome the influence caused by non-uniform samples, and acquire better imaging result.