一种基于MSR二维谱的改进的OMEGA-K双基SAR成像算法

• •

一种基于MSR二维谱的改进的OMEGA-K双基SAR成像算法

刘玉春,王俊,张各各

西安电子科技大学雷达信号处理国家重点实验室

收稿日期:2012-08-09 修回日期:2012-11-05 发布日期:2013-06-20
通讯作者: 王俊

A modified OMEGA-K imaging algorithm for bistatic SAR based on MSR 2-D spectrum

Received:2012-08-09 Revised:2012-11-05 Published:2013-06-20

摘要/Abstract

摘要： 针对基于级数反演（MSR）二维谱的双基合成孔径雷达（SAR）OMEGA-K成像算法复杂度高的问题，提出双基SAR改进的OMEGA-K成像算法。在双基SAR OMEGA-K算法的基础上，通过在回波信号的距离频域方位时域内的斜距历程高阶项对消处理，使回波信号二维谱和基于低阶泰勒展开的MSR二维谱相匹配，进而采用OMEGA-K成像算法实现聚焦成像。仿真实验中，在斜距历程同为二阶展开的情况下，改进的OMEGA-K算法的聚焦效果要优于常规OMEGA-K算法，而与三阶泰勒展开时的常规OMEGA-K算法聚焦效果非常接近。这表明该算法在斜距历程低阶泰勒展开的情况下可以取得较好的聚焦效果，能够降低算法的复杂度。

关键词: 双基合成孔径雷达（SAR）, 成像算法, 改进的OMEGA-K

Abstract: Since the bistatic synthetic aperture radar(SAR)OMEGA-K imaging algorithm based on method of series reversion (MSR) 2-D spectrum has a high complexity,a modified OMEGA-K algorithm is proposed.On the basis of the conventional OMEGA-K algorithm,a high order terms cancellation processing of slant range history is applied in the range-frequency azimuth-time domain of the target signal.Using the processing,the 2-D spectrum of the target response match the MSR 2-D spectrum based on lower order taylor series expandness of slant range history well.In the simulation experiment,the focusing performance of the modified OMEGA-K imaging algorithm on the basis of second-order Taylor expansion is better than the conventional,and it is close to the conventional OMEGA-K algorithm on the basis of third-order Taylor expansion.It shows that the proposed algorithm has a good focusing performance and the complexity of the algorithm is reduced.

Key words: bistatic synthetic aperture radar(SAR), imaging algorithm, modified OMEGA-K

中图分类号:

TN957

刘玉春王俊张各各. 一种基于MSR二维谱的改进的OMEGA-K双基SAR成像算法[J]. , 0, (): 0-0.

参考文献

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed