机载超宽带SAR运动补偿方法  

Motion Compensation Method of Airborne Ultra-WideBand SAR

作　　者：安道祥[1] 黄晓涛[1] 李欣[1] 周智敏[1] 齐星 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073 [2]贵州省贵航无人机有限责任公司,贵州安顺561000

出　　处：《信号处理》2011年第1期73-80,共8页Journal of Signal Processing

基　　金：国家自然科学基金项目(60972121);教育部新世纪人才支持计划(NCET-07-0223);全国优秀博士学位论文作者专项资金资助项目(201046);国防科学技术大学研究生创新资助(B090404)

摘　　要：基于机载合成孔径雷达(SAR)正弦运动误差模型,本文了研究了机载超宽带SAR运动补偿方法。首先,本文从理论上解释了传统"两步运动补偿法"原理,并分析了"两步运动补偿法"的优势与不足。其次,基于分析结果,文中提出一种"两步运动补偿法"的改进处理流程,称为"单步运动补偿法"。在"单步运动补偿法"中,用于补偿距离空变相位误差的"二阶补偿"由在距离弯曲校正(RCMC)后的回波域内进行改为在RCMC前的回波域内进行。与原始"两步运动补偿法"相比,"单步运动补偿法"具有更好的高频运动误差补偿性能。文中详细推导了所提运动补偿方法,并通过仿真实验证明了该方法的有效性。Based on the sinusoidal motion error model of airborne synthetic aperture radar（SAR）,the motion compensation （MoCo） methods for airborne ultrawide band（UWB SAR） are studied.First,we explain the rationale of the two-step MoCo strategy. And an analysis of the advantage and disadvantage of this MoCo strategy is carried out.Based on the analysis results,an extended two-step MoCo strategy with modified implementation flow is proposed,which is called the one-step MoCo strategy.In one-step MoCo strategy, the second-order MoCo used for compensating the range-variant phase error is implemented before the range cell migration correction （RCMC） processing,instead of after the RCMC processing.As compared to the traditional two-step MoCo strategy,the one-step MoCo strategy has better performance on compensating the high frequency motion error.This paper deducts the proposed MoCo method in detail, and proves its validity with simulation experiment.

关 键 词：超宽带 合成孔径雷达 运动补偿 

分 类 号：TN958.7[电子电信—信号与信息处理]