New Resolution Analysis Method for High Medium-Earth Synthetic Aperture Radar Satellites

doi:10.7652/xjtuxb201608012

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New Resolution Analysis Method for High Medium-Earth Synthetic Aperture Radar Satellites

更新时间：2025-05-08

- New Resolution Analysis Method for High Medium-Earth Synthetic Aperture Radar Satellites
- Vol. 50, Issue 8, Pages: 70-76(2016)
- 作者机构：
  
  中国空间技术研究院西安分院,西安,710000
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201608012
  CLC： TN957
- Online First：10 August 2016，
  
  Published：2016
- 稿件说明：
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New Resolution Analysis Method for High Medium-Earth Synthetic Aperture Radar Satellites[J]. 2016, 50(8): 70-76.
DOI：

New Resolution Analysis Method for High Medium-Earth Synthetic Aperture Radar Satellites[J]. 2016, 50(8): 70-76. DOI： 10.7652/xjtuxb201608012.

摘要

针对中高轨合成孔径雷达(SAR)卫星运动轨迹复杂、导致传统SAR卫星分辨率分析方法不再适用的问题

提出了一种分析中高轨SAR卫星理论分辨率的时域模糊函数(TDAF)方法。该方法根据分辨率的定义

从时域模糊函数进行推导

利用归一化模糊函数求解任意方向上的空间分辨率

然后以地面分辨椭圆的方式对中高轨SAR卫星分辨率进行描述

更加完备地表征了曲线运动轨迹的中高轨SAR系统分辨特性。结合后向投影算法仿真验证了基于TDAF算法的有效性。仿真结果表明

TDAF方法可以精确计算中高轨SAR卫星的理论分辨率

误差在±1%以内

可为中高轨SAR卫星的轨道设计及成像性能指标分析提供依据。

Abstract

A simple and efficient method based on time-domain ambiguity function(TDAF)to analyze theoretical resolution is proposed to solve the problem that the traditional method of resolution analysis is no longer applicable for the high medium-earth-orbit synthetic aperture radar(SAR)satellite with a complicated relative moving trajectory. The definition of imaging resolution is utilized to derive accurate resolution in any direction from the time-domain function and the normalized ambiguity function. Then

the distinguishable ellipse on the ground is used to fully describe the resolution characteristics of the high medium-earth-orbit SAR. Simulations are performed to verify the correctness of the proposed algorithm. The results show that the proposed method achieves high accuracy of the high medium-earth-orbit SAR resolution and the error is within ±1%. It can be concluded that the method could provide guidances for orbit design of high medium-earth-orbit SAR and analysis of imaging performance index.

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references

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