DBF-SAR系统1比特量化设计  

One-Bit Quantization for DBF-SAR

作　　者：黄杰文[1,2] 祁海明[1,3] 李杨[1,2] 禹卫东[1] 

机构地区：[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,北京100039 [3]微波成像技术国家重点实验室,北京100190

出　　处：《宇航学报》2011年第11期2387-2394,共8页Journal of Astronautics

基　　金：中国科学院优秀博士论文院长奖获得者专项基金(0813260042);微波成像技术国家重点实验室基金(9140C1903041003)

摘　　要：为解决DBF-SAR系统数据率巨大和星上处理复杂的问题,提出了一种将各通道回波和距离向匹配滤波器都1比特量化的处理方法。首先证明当回波信噪比较低时,符号位已包含了目标的幅度信息,从而为1比特量化提供了可能;在此基础上,利用各通道间信号相关性强而噪声相关性弱的特点,通过数字波束成形技术,提高了系统信噪比。接着探讨了该方法的硬件实现结构和资源消耗情况。最后,仿真结果表明了方法的有效性。该方法在不明显降低成像质量的前提下,简化了系统电路设计和减小了数据率,对DBF-SAR系统的工程实现有一定参考价值。In order to deal with the issue of huge data rate and complicated onboard processing in digital beamforming synthetic aperture radar （DBF-SAR） system, an one-bit quantizatiou for both echoes and range matched filters is proposed. First, the feasibility of the one-bit quantization that the amplitude information on the signal is included in the sign of the echo under the low signal-to-noise ratio （SNR） condition is confirmed. The digital beamforming technique used coherently to combine the signals in all receiver channels improves the system＇ s SNR. Then the processing architecture and the resource consumption are discussed. Finally, simulation results verify the effectiveness of the method. This method simplifies the electrical design of the system and reduces data rate while the image quality is slightly degraded, and it is valuable for implementation of DBF-SAR.

关 键 词：合成孔径雷达 数字波束成形 1比特量化 

分 类 号：TN957[电子电信—信号与信息处理]