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高分辨率星载SAR非走-停假设下回波仿真

Echo Simulation for High-resolution Spaceborne SAR
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摘要 SAR回波仿真对于其信号处理算法的研究和开发有着重要意义.在星载高分辨率SAR系统中,由于电磁波传播路径较长,雷达平台速度较快,传统的走-停假设下的双曲斜距历程已不能满足高精度的SAR回波模拟的要求.综合考虑了椭圆轨道偏心率和地球自转两方面的因素,采用二分查找思想,给出非走-停假设下回波仿真中的斜距历程数值求解方法,并讨论了高分辨率星载SAR中,基于走-停假设的传统回波仿真方法中的斜距历程与文中求解的斜距历程的差异.验证了所提出仿真方法对超高分辨率星载SAR的有效性. Echo simulation is of significant importance for the study and design of SAR focusing algorithm.As for high-resolution space borne SAR,the conventional hyperbolic range equation under stop-go assumption is not valid due to the high velocity of the platform and the long distance between the radar and the illuminated scene.This paper considered the influences of the eccentricity of elliptic orbit and Earth rotation on slant range in simulation of highresolution space borne SAR echo.By employing the binary search strategy,we presented a numerical method to calculate the accurate slant range.The difference between the accurate slant range history and the conventional one derived under stop-and-go assumption was illustrated by simulation results,validating the necessity of our method for ultra-high-resolution space borne SAR echo simulation.
作者 赵新强 魏丹
机构地区 河南大学软件学院 河南大学计算机与信息工程学院
出处 《河南大学学报（自然科学版）》 CAS 2016年第5期557-561,共5页 Journal of Henan University:Natural Science
基金 国家自然科学基金项目(41571417)
关键词 星载SAR 超高分辨率 走-停假设 回波仿真 spaceborne SAR ultra-high-resolution stop-and-go assumption echo simulation
分类号 TN957.5 [电子电信—信号与信息处理]
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参考文献17

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二级参考文献12

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共引文献8

河南大学学报（自然科学版）
2016年 第5期

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