基于参数重建的机载SAR图像目标高精度定位  

High accuracy positioning of airborne SAR image target based on parameter reconstruction

作　　者：徐源 罗运华 赵耀 XU Yuan;LUO Yunhua;ZHAO Yao(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100094 [2]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《电子设计工程》2024年第13期176-180,共5页Electronic Design Engineering

摘　　要：距离-多普勒(RD)定位模型是应用最为广泛的机载合成孔径雷达(SAR)图像目标定位模型,然而传统方法求解RD定位模型存在需要设置初始值和迭代不稳定的问题,同时定位结果的精度受载机运动参数的精度影响,而机载平台导航系统精度有限,无法满足高精度定位的需求。针对上述问题,该文提出一种基于参数重建的SAR图像目标定位方法,通过图像匹配结合最小二乘法重建机载平台运动参数,以减小精度不足的影响,利用数学解析方法求解RD定位模型,实现SAR图像目标快速稳定的高精度定位。通过实测数据实验可知,该文从算法用时和定位精度两方面验证了所提方法的有效性。The Range-Doppler(RD)positioning model is the most widely used airborne Synthetic Aperture radar(SAR)image target positioning model.However,the traditional method to solve the RD positioning model has the problems of needing to set the initial value and iteration instability.At the same time,the accuracy of positioning results is affected by the accuracy of the aircraft motion parameters,while the accuracy of the airborne platform navigation system is limited and cannot meet the requirements of highprecision positioning.Aiming at the above problems,this paper proposes a SAR image target positioning method based on parameter reconstruction.The motion parameters of the airborne platform are reconstructed by image matching combined with the least square method to reduce the impact of insufficient accuracy,and the mathematical analytic method is used to solve the RD positioning model to achieve high-precision,fast and stable positioning of SAR image targets.Through the experiment of measured data,this paper verifies the effectiveness of the method from two aspects of algorithm time and positioning accuracy.

关 键 词：机载合成孔径雷达 距离-多普勒定位 数学解析算法 参数重建 

分 类 号：TN957.52[电子电信—信号与信息处理]