改进的发射机固定双基SAR频域成像算法

首先建立了发射机固定、接收机工作在三种模式下(条带、聚束、滑动聚束)的一站固定式双基SAR回波信号模型，给出了回波模拟方法并总结了该类双基SAR的成像特点，然后对基于RD域分块的二维频域成像算法做了改进，在没有明显增加计算量的情况下，提出一种基于距离标度插值的方法，解决了残余相位补偿中出现的畸变问题，详细论证了一次分块处理所存在的问题，并提出采用两次分块处理的方法对算法进行完善，最后通过大场景点阵目标仿真实验，验证了本文方法的正确性和处理宽测绘带数据的可行性。

An Improved Imaging Algorithm in Frequency Domain for Bistatic SAR with Stationary Transmitter

The signal model and the echo simulation approach of one-stationary bistatic SAR that the transmitter is fixed and the receiver works in three modes such as stripmap mode, spotlight mode and sliding spotlight mode are established first, then the imaging features are summarized. After that, an improved RMA using range sub-blocks in range Doppler domain is presented. To cancel the phenomenon of aberration in residual phase compensation, a range-scale interpolation is adopted without adding higher computational load in the proposed algorithm. The defects of block processing only once are demonstrated, and a twice-sub-blocks processing method is proposed to solve the limitation in the conventional algorithm. Finally, the validity of the algorithm and the feasibility of dealing with wide swath SAR data are verified by point targets simulation with a big size scene.