基于优化Golomb序列和ω-k算法的低飞平台大斜视合成孔径雷达成像

doi:10.3969/j.issn.1000-1093.2015.01.027

兵工学报 ›› 2015, Vol. 36 ›› Issue (1): 187-192.doi: 10.3969/j.issn.1000-1093.2015.01.027

• 研究简报 • 上一篇

基于优化Golomb序列和ω-k算法的低飞平台大斜视合成孔径雷达成像

欧建平¹，李伟²，吴昊天²，张军¹，颜佳冰²

(1.国防科学技术大学电子科学与工程学院，湖南长沙 410038； 2.空军工程大学信息与导航学院，陕西西安 710077)

收稿日期:2013-08-20 修回日期:2013-08-20 上线日期:2015-03-14
作者简介:欧建平(1974—)，男，副教授
基金资助:
国家自然科学基金项目(61302153)；航空科学基金项目（20140196003、20122096011)

Imaging Method for SAR with Low Height and Large Squint Angle Based on Optimized Golomb Sequence and ω-k Algorithm

OU Jian-ping¹, LI Wei², WU Hao-tian², ZHANG Jun¹, YAN Jia-bing²

（1.College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410038, Hunan, China;2Information and Navigation College, Air Force Engineering University, Xi’an 710077, Shaanxi, China）

Received:2013-08-20 Revised:2013-08-20 Online:2015-03-14

摘要/Abstract

摘要： 低飞平台大斜视合成孔径雷达（SAR）高度低，对脉冲重复频率要求高，斜视角大，导致多普勒中心远离零点，基于传统成像方法面临严重散焦的问题。针对低飞平台大斜视SAR成像问题，建立了脉冲重复频率与斜视角之间关系模型。从避免距离模糊、方位模糊、回避发射波干扰等出发，以实现高分辨率成像为目的，合理设计脉冲重复频率，解决了成像中散焦问题。基于循环算法优化Golomb序列，并利用信号良好自相关性获得高的距离向分辨率。基于STOLT插值，利用ω-k成像算法处理原始数据，得到了良好成像效果。仿真证明该算法可有效解决大斜视平台SAR成像问题。

关键词: 雷达工程, 合成孔径雷达, 低飞, 大斜视, 优化Golomb序列, ω-k算法

Abstract: Higher requirement of pulse repetition frequency will be faced when synthetic aperture radar (SAR) is at a very low height. Doppler centroid will deviate from zero when the squint angle is too large,resulting in defocusing the final image. For imaging of low-height and squint-looking SAR, a pulse repetition frequency is designed properly in order to get a high resolution image and avoid the range and azimuth ambiguities and the interference of the transmitted pulses, and the problem of overlaying the azimuth spectrais solved. Golomb sequence is optimized with cyclic algorithm, and a good autocorrelation is used to get high range resolution. After STOLT interpolation mapping, the raw data is properly processed using ω-k algorithm to get agood imaging result. Simulation results show that the algorithm can solve the problem of low height and large squint SARimaging.

Key words: radar engineering, synthetic aperture radar, low height, large squint angle, optimized Golomb sequence, ω-k algorithm

中图分类号:

TN794

欧建平，李伟，吴昊天，张军，颜佳冰. 基于优化Golomb序列和ω-k算法的低飞平台大斜视合成孔径雷达成像[J]. 兵工学报, 2015, 36(1): 187-192.

OU Jian-ping, LI Wei, WU Hao-tian, ZHANG Jun, YAN Jia-bing. Imaging Method for SAR with Low Height and Large Squint Angle Based on Optimized Golomb Sequence and ω-k Algorithm[J]. Acta Armamentarii, 2015, 36(1): 187-192.

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基于优化Golomb序列和ω-k算法的低飞平台大斜视合成孔径雷达成像

Imaging Method for SAR with Low Height and Large Squint Angle Based on Optimized Golomb Sequence and ω-k Algorithm

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