基于外辐射源的机载无源SAR成像算法

提出一种基于外辐射源的单发单收模式的机载无源SAR成像方法。该方法基于单个外辐射源,利用载机作规则的环形运动来合成等效雷达孔径对地面静止目标进行成像。由于接收到的数据非均匀且数据量较少,通过对接收回波数据进行坐标变换和插值运算,直接在频域数据空间利用二维傅里叶变换重建目标的散射函数分布。理论推导和计算机仿真结果证明该方法是有效的。

Airborne passive SAR imaging algorithm based on external illuminator

An airborne passive SAR radar imaging algorithm is proposed,which makes use of the regular circular motion by an airplane to form a synthetic aperture in the case of one external illuminator available.Because the collected data are non-uniform and sparse in the Fourier space,the target scattering function can be reconstructed from the echo data through coordinate conversion,interpolation and two-dimensional Fourier transform.Theory deduction and computer simulation confirm the effectiveness of the proposed algorithm.