摘要
参考信号的稳健重构是数字波形外辐射源雷达的关键技术之一,其中信道估计的精度直接关系到重构参考信号的纯度。针对数字地面多媒体广播(DTMB)外辐射源雷达在接收系统基带采样率是信号符号速率非整数倍时所面临的参考信号重构质量问题,该文在压缩感知的匹配追踪算法基础上,提出一种改进的信道估计新算法。仿真分析表明,相比于广泛采用的时域相关法和最小二乘(LS)算法,改进后的算法有更好的频率适应性,鲁棒性高,在多种信道环境下表现优越。实测数据进一步验证了采用所提出的信道估计算法可较大提升参考信号的重构质量,从而有利于目标探测。
The steady reference signal reconstruction is one of the key technologies of passive radar with digital waveform, and the accuracy of channel estimation is directly related to the reference signal purity. To deal with the problem of reference signal reconstruction for Digital Terrestrial Multimedia Broadcasting （DTMB） based passive radar when the receiving system samples at a non-integer multiples of the symbol rate, an improved channel estimation is proposed on the basis of matching pursuit algorithm which is based on the compression perception. Simulation results show that compared to the widely used time domain correlation algorithm and the Least Squares （LS） algorithm, the improved algorithm has better frequency adaptability and robustness, and performs superiorly in various channel environments. Real data processing results further demonstrate that it significantly raises the quality of the reconstructed signal using the proposed algorithm and provides a better condition for the target detection.
出处
《电子与信息学报》
EI
CSCD
北大核心
2017年第5期1044-1050,共7页
Journal of Electronics & Information Technology
基金
国家重点研发计划(2016YFB0502403)
国家自然科学基金(61331012
61371197
U1333106
61271400)
湖北省支撑项目(2015BCE075)
博士后创新人才支持计划(BX201600117)
湖北省自然科学基金(2016CFA061)~~
关键词
外辐射源雷达
地面数字多媒体广播
参考信号重构
信道估计
Passive radar
Digital Terrestrial Multimedia Broadcasting （DTMB）
Reference signal reconstruction
Channel estimation
