基于改进BP算法的机载双基地SAR成像

An Improved Back Projection Imaging Algorithm of Airborne Bistatic SAR

首先建立了机载双基地SAR的几何模型、距离历程和回波模型。接着简要总结了双基地SAR成像的算法思路。通过理论推导改进了单基地BP成像算法使其适合于双基地情况,并探讨了改进的快速BP算法。最后用点目标和面目标仿真验证了双基地下BP算法的有效性和适用性,并与RD算法进行了性能的比较。

The geometry, the distance history and echo signal models of airborne bistatic SAR are built firstly. Then the imaging algorithm of bistatic SAR is summarized briefly. On the basis of analyzing the BP algorithm for monostatic SAR, the theory of BP algorithm for bistatic SAR is given, and an improved BP algorithm is discussed. At last the simulation results demonstrate the correctness of the back projection algorithm used in bistatic SAR. The improved BP algorithm is compared with RD algorithm.