二维数字匹配滤波的信噪比分析  

Analysis of Signal-to-Noise Ratio in Two-dimensional Digital Matched Filtering

作　　者：龙杰 李聪欣 蒋超 赵君 

机构地区：[1]信息系统工程重点实验室,北京100038 [2]北京理工大学,北京100081

出　　处：《航天控制》2015年第4期17-23,共7页Aerospace Control

摘　　要：合成孔径雷达(Synthetic Aperture Radar,SAR)采用二维匹配滤波的方式提高信噪比,但对信噪比增益的计算结果存在一定的争议,传统的计算方法主要基于脉冲压缩和相参积累对SAR信噪比展开分析,但会产生不同的计算结果。本文针对SAR数字信号处理的特点,基于带限白噪声的假设,在数字域推导了输出噪声的功率,并得到了二维数字匹配滤波的信噪比增益,解决了SAR信噪比存在争议的问题,并分析了SAR系统噪声带宽对信噪比的影响,给出了采样率的优化设计准则,最后通过仿真验证了理论推导的正确性,为SAR系统优化设计提供了理论依据。The synthetic aperture radar （Synthetic Aperture Radar, SAR ） is using a two-dimensional matched filter to improve the signal to noise ratio, but the signal-to-noise ratio （SNR） gain of synthetic ap- erture radar （SAR） is controversial. The SAR signal-to-noise ratio is analyzed by using the traditional method based on pulse compression and coherent integration, but it will have different calculation results. In this paper, in connection with the characteristics of the SAR digital signal processing, the SNR gain of the two-dimensional matched filter is derived to solve the contentious issue of SAR signal-to-noise ratio ,which is based on the assumption of the band-limited white noise in the filtering on SNR is analyzed and the optimized design criteria sion of the analysis is verified by simulations, which provides a digital domain. And the impact of matched of sampling rate are presented. The conclu- theoretical basis for the SAR system design.

关 键 词：合成孔径雷达 信噪比 脉冲压缩 匹配滤波 

分 类 号：TN957[电子电信—信号与信息处理]