基于RD域分块的改进距离徙动成像算法

Modified RMA based on range sub-blocks in range-Doppler domain

研究了二维频域成像算法,提出一种基于RD域分块的改进距离徙动成像算法,并将该算法与近似算法和一般逆变标算法进行了点阵目标仿真和运算效率比较.当测绘带较宽且距离徙动较大时,该算法聚焦性能优于近似算法和一般逆变标算法.通过比较还可看出该算法运算效率高于逆变标算法.最后用实测数据仿真验证了该算法是可行的.

On the basis of our study on SAR imaging algorithm in 2D frequency domain,we propose a modified range migration algorithm（RMA） using range sub-blocks in range-Doppler domain（RDB-RMA）,and make a comparison between our proposed algorithm and other two algorithms,approximate RMA and scaled inverse Fourier transformation algorithm（SIFTA）.The simulation data show that RDB-RMA is better in focusing capabilitity than the other two algorithms,when the swath is very wide and the range migration is very large.By comparing these algorithms,we conclude that RDB-RMA is better in computing efficiency than SIFTA.Finally,an experiment carried out on measured data confirms feasibility of the proposed algorithm.