| 分布式GEO SAR模糊度分析 |
| |
| 引用本文： | 陈志扬,王涛,董锡超,胡程.分布式GEO SAR模糊度分析[J].信号处理,2019,35(6):1097-1103. |
| |
| 作者姓名： | 陈志扬 王涛 董锡超 胡程 |
| |
| 作者单位： | 北京理工大学信息与电子学院雷达技术研究所 |
| |
| 基金项目： | 国家重大科研仪器研制项目（31727901,61827901）；中国科协青年人才托举工程（2017QNRC001）；长江学者奖励计划（T2012122）
|
| |
| 摘 要： | 地球同步轨道合成孔径雷达（GEO SAR）具有短重访、广覆盖等优势。分布式GEO SAR由多个GEO SAR同时收发形成多个相位中心，具有可降低合成孔径时间、提高信噪比等优点。模糊度是雷达系统设计中的重要指标，传统SAR的模糊度计算通常在距离时域、方位频域进行。然而在分布式GEO SAR中，通常无需进行全孔径成像即可获得满足要求的分辨率，因而点目标的方位向信号带宽低于场景瞬时多普勒带宽，使得基于方位频域的模糊度计算方法失效。此外，双基地配置以及地球球形表面也给地面模糊区位置的计算带来困难。本文首先给出考虑地球球形表面的双基地GEO SAR模糊区位置的近似计算方法，然后给出分布式GEO SAR模糊度的计算步骤。仿真对比分析了传统频域方法与本文所提方法，并详细分析了单基地GEO SAR、双基地GEO SAR和多基地GEO SAR的模糊度特点。
|
| 关 键 词： | 模糊度 分布式地球同步轨道SAR 模糊区位置 时域计算方法 |
| 收稿时间： | 2019-03-25 |
Distributed Geosynchronous Synthetic Aperture Radar Ambiguity Analysis |
| |
| Affiliation: | Radar Research Lab, School of Information and Electronics, Beijing Institute of TechnologyKey Laboratory of Electronic and Information Technology in Satellite Navigation (Beijing Institute of Technology), Ministry of Education |
| |
| Abstract: | Geosynchronous Orbit Synthetic Aperture Radar (GEO SAR) has the advantages of short revisit and large coverage. Distributed GEO SAR combines multiple GEO SAR to form multiple phase centers simultaneously, which can reduce the synthetic aperture time and improve the signal-to-noise ratio. The ambiguity is an important indicator for the design of radar systems. The traditional method of ambiguity calculation is usually carried out in the range time domain and azimuth frequency domain. However, in distributed GEO SAR, full aperture imaging is usually not necessary for general resolution, so the azimuth signal bandwidth is lower than the instantaneous Doppler bandwidth of the scene, which makes the ambiguity calculation method in the azimuth frequency domain invalid. In addition, the bistatic configuration and the Earth’s spherical surface also bring difficulties to the determination of the ambiguity regions. In this paper, an approximate calculation method of bistatic GEO SAR ambiguity region position is proposed firstly taking the Earth’s spherical surface into consideration, and then the calculation steps of distributed GEO SAR ambiguity are given. A comparison between the traditional frequency domain method and the proposed time domain method is carried out in the simulation, and the ambiguities of monostaitc GEO SAR, bistatic GEO SAR and multistatic GEO SAR are analyzed in detail. |
| |
| Keywords: | |
|
| 点击此处可从《信号处理》浏览原始摘要信息 |
|
点击此处可从《信号处理》下载全文 |
|
