基于运动参数估计的中轨道星载SAR舰船成像算法研究  

Research on imaging algorithm of moving ship based on motion parameters estimation in MEO SAR

作　　者：赵彬[1] 廖婉伶 朱鑫 黄祖镇 张云[1] ZHAO Bin;LIAO Wanling;ZHU Xin;HUANG Zuzhen;ZHANG Yun(Dept.Electronic Engineering,Harbin Institute of Technology,Harbin 150001,China;The 14th Research Institute of China Electronics Technology Corporation,Nanjing 210012,China)

机构地区：[1]哈尔滨工业大学电子工程系,哈尔滨150001 [2]中国电子科技集团第十四研究所,南京210012

出　　处：《遥测遥控》2022年第2期81-90,共10页Journal of Telemetry,Tracking and Command

基　　金：国家自然科学基金(61201308)。

摘　　要：中轨合成孔径雷达具有非匀直运动轨迹的特点,对非合作运动舰船目标成像时,相对运动复杂,成像困难。提出一种适用于中轨SAR海上运动舰船目标的高分辨成像算法,首先分析中轨SAR的特性,推导中轨SAR精确的斜距模型,分析由运动舰船引起的回波相位误差,结合斜距模型和多普勒参数估计推导舰船运动参数,进而修正斜距模型,根据修正后的斜距模型补偿舰船运动带来的误差,获得清晰的运动舰船目标图像,并通过实验仿真验证了所提算法能够有效改善成像效果,得到聚焦良好的目标图像。Aiming at the characteristics of Medium Orbit Synthetic Aperture Radar(MEO SAR)that the radar trajectory is non-straight and ship targets are not cooperative,this paper proposed a high-resolution imaging algorithm for moving ship under MEO SAR system.Firstly,the characteristics of MEO SAR are analyzed.The accurate slant range model of MEO SAR is derived,and the echo phase error caused by moving ships is analyzed.Combined with range model and Doppler parameter estimation to estimate ship motion parameters and then modify the range model.According to the modified range model,the error caused by ship motion is compensated to perform imaging of moving ship.Finally,it is verified by experimental simulation that good imaging results can be obtained within the range of common ship targets at sea.

关 键 词：中轨SAR 参数估计 舰船目标 斜距模型 

分 类 号：V443.2[航空宇航科学与技术—飞行器设计]