| 星载SAR回波中频采样后直接BAQ的设计 |
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| 作者姓名： | 黄杰文 祁海明 李杨 禹卫东 |
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| 作者单位： | 1. 中国科学院电子学研究所,北京 100190;
2. 中国科学院研究生院,北京 100049 |
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| 摘 要： | 提出了一种星载合成孔径雷达(SAR)回波中频采样后直接分块自适应量化(BAQ)的设计.从理论上证明了中频BAQ的可行性.与中频回波数字下变频后再BAQ的典型结构相比,该设计将数字下变频放到地面进行,简化了电路结构,节省了硬件资源.采用免混频结构时,仿真结果表明:下传数据率相同的情况下两者的性能接近,新方案所耗费的硬件资源不到前者的1/3.
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| 关 键 词： | 星载合成孔径雷达 中频采样 分块自适应量化 数字下变频 |
| 收稿时间： | 2009-10-26 |
| 修稿时间： | 2009-11-25 |
Design of block adaptive quantization algorithm after IF sampling of space-borne SAR echoes |
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| Authors: | HUANG Jie-Wen QI Hai-Ming LI Yang YU Wei-Dong |
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| Institution: | 1. Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;
2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | This paper presents a design of block adaptive quantization (BAQ) algorithm immediately after echoes inter-frequency (IF) sampling for space-borne SAR system. Theoretical derivation is given in detail. Compared to the typical structure which implements BAQ after digital down conversion (DDC) in orbit, electrical system design is simplified and less hardware resource is needed when performing DDC on ground. Experimental results show that the two methods achieve similar performance with the same data rate when using mixer-free structure, and the resource for the new design is less than 1/3 of the resource for the typical structure. |
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| Keywords: | space-borne SAR IF sampling block adaptive quantization (BAQ) digital down conversion (DDC) |
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