| 摘要: |
| 本文研究了星载运动目标检测（Ground Moving Target Indication, GMTI）系统中的目标定位问题。首先，采用几何向量法解释GMTI系统同时实现杂波相消和目标定位的基本原理。然后，基于高斯白噪声假设，推导了干涉相位误差的概率密度函数，该函数描述了目标定位精度与目标信噪比（Signal?to?Noise Ratio, SNR）和基线之间的关系。应用推导的概率密度函数，对现有的几个星载SAR?GMTI系统的目标定位性能进行分析比较，分析了基线误差对定位性能的影响。仿真结果验证了提出的概率密度函数的有效性。 |
| 关键词: 概率密度函数 运动目标检测 沿航迹干涉仪 定位精度 高斯白噪声 |
| DOI：DOI:10.3969/j.issn.1672-2337.2023.03.007 |
| 分类号:TN958 |
| 基金项目: |
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| Analysis of Target Location Error in Spaceborne SAR⁃GMTI Systems with Probability Method |
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HU Ruixian， WANG Yongda， ZHANG Zhao
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China Academy of Electronics and Information Technology, Beijing 100041, China
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| Abstract: |
| The location problem for spaceborne ground moving target indication （GMTI） system is discussed. Firstly, this paper explains the theory of performing clutter suppression and moving targets location simultaneously in the GMTI system using geometry. Then, based on the Gaussian white noise assumption, the probability density function （PDF） of interferometric phase error, which shows the fact that the location accuracy is a function of the signal?to?noise ratio （SNR） and antenna distance, is derived. With the derived PDF, we compare the location performance of some existing spaceborne GMTI systems. Moreover, the influence of baseline error that affects the location performance is discussed. Finally, simulation results are provided to validate the effectiveness of this PDF model. |
| Key words: probability density function （PDF） ground moving target indication （GMTI） along⁃track interferometry （ATI） location accuracy Gaussian white noise |
