斜视情况下机载顺轨干涉SAR敏感度分析  

Sensitivity Analysis of Along-track Interferometric Synthetic Aperture Radar in the Presence of Squint

作　　者：张慧[1,2,3] 洪峻[1,4] 李纪传[1,4,3] 明峰[1,4] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]空间信息处理与应用系统技术重点实验室,北京100190 [3]中国科学院大学,北京100190 [4]微波成像技术重点实验室,北京100190

出　　处：《电子与信息学报》2014年第9期2207-2213,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61101200)资助课题

摘　　要：顺轨干涉合成孔径雷达(ATI-SAR)具有检测慢速运动目标径向速度的能力,其测速精度受各干涉参数精度的影响。敏感度分析是衡量各干涉参数误差对径向速度误差影响程度的一种主要手段。目前关于ATI-SAR的研究主要针对正侧视情况进行,没有考虑斜视角存在的情况。鉴于此,该文首先推导了斜视情况下ATI-SAR测量目标径向速度的表达式,进而得到了斜视情况下目标径向速度关于各干涉参量的敏感度大小。通过机载参数仿真,得到了正侧视及斜视情况下不同测速精度要求对各干涉参数的误差要求,为实际机载系统的误差分析和定标需求提供了定量化参考。Along-Track Interferometric Synthetic Aperture Radar （ATI-SAR） has the potential to measure the radial velocities of slowly moving targets. The accuracy of the radial velocity is limited by the accuracy of the interferometric parameters. Sensitivity equations are good ways to analyze the impact of the system parameters on interferometric SAR. Available sensitivity analysis for ATI-SAR mainly focuses on the case of no squint angle. In this paper, the expression of the radial velocity in the presence of squint is derived firstly, and the sensitivity equations are further obtained. Moreover, the sensitivity of the interferometric parameters is simulated with airborne parameters, and the accuracy requirements for different parameters are given for different velocity accuracy requirements, which provide quantitative reference for real airborne ATI-SAR analysis and calibration requirement analysis.

关 键 词：SAR 顺轨干涉 斜视 敏感度 

分 类 号：TN959.73[电子电信—信号与信息处理]