电子学报2018，Vol.46Issue(1)：39-47,9.DOI:10.3969/j.issn.0372-2112.2018.01.006
随机稀疏调频步进信号距离像抗混叠方法研究
An Anti-Range Aliasing Method for Random Sparse Chirp Frequency-Stepped Signal
摘要
Abstract
The ambiguity range of the traditional stepped-frequency waveform is decided by the frequency step,which result in range aliasing.To solve the above problem,a compressive sensing-based anti-range aliasing method for random sparse chirp frequency-stepped (RSCFS) signal is proposed.In the method,the sub pluses are dechirped firstly.Then the echoes are treated as the measurement data of the equivalent bandwidth LFM signal.Secondly,the corresponding measurement matrix is constructed according to the random transmission mode of the sub pulses,and then the compressed sensing reconstruction model of the RSCFS signal is built.At the same time,the high resolution range profile can be obtained by the compressed sensing reconstruction algorithm.At last,the ambiguity range of the proposed method is analyzed,and the factors that influence the size of the ambiguity range and the parameter setting criteria are given.In this method,the range profile synthesis process of the RSCFS signal is regarded as the process of the equivalent bandwidth LFM signal.It can not only reduce the restriction of the carrier frequency step to ambiguity range,effectively overcome the range aliasing problem,but also improve the range profile synthetic performance.Simulation results show the effectiveness of the proposed method.关键词
压缩感知/随机稀疏调频步进信号/距离混叠/高分辨距离像Key words
compressive sensing/random sparse chirp frequency-stepped waveform/range aliasing/high resolution range profile分类
信息技术与安全科学引用本文复制引用
吕明久,李少东,杨军,马晓岩..随机稀疏调频步进信号距离像抗混叠方法研究[J].电子学报,2018,46(1):39-47,9.基金项目
国家自然科学基金(No.61671469) （No.61671469）
