Sub-Nyquist radar receiver based on photonics-assisted compressed sensing and cascaded dictionaries  

作　　者：刘诗扬 陈阳 Shiyang Liu;Yang Chen(Shanghai Key Laboratory of Multidimensional Information Processing,East China Normal University,Shanghai 200241,China;Engineering Center of SHMEC for Space Information and GNSS,East China Normal University,Shanghai 200241,China)

机构地区：[1]Shanghai Key Laboratory of Multidimensional Information Processing,East China Normal University,Shanghai 200241,China [2]Engineering Center of SHMEC for Space Information and GNSS,East China Normal University,Shanghai 200241,China

出　　处：《Chinese Optics Letters》2024年第1期159-163,共5页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(No.61971193);the Natural Science Foundation of Shanghai(No.20ZR1416100);the Songshan Laboratory Pre-research Project(No.YYJC072022006);the Shanghai Aerospace Science and Technology Innovation Fund(No.SAST2022074);the Science and Technology Commission of Shanghai Municipality(No.22DZ2229004)。

摘　　要：A sub-Nyquist radar receiver based on photonics-assisted compressed sensing is proposed.Cascaded dictionaries are applied to extract the delay and the Doppler frequency of the echo signals,which do not need to accumulate multiple echo periods and can achieve better Doppler accuracy.An experiment is performed.Radar echoes with different delays and Doppler frequencies are undersampled and successfully reconstructed to obtain the delay and Doppler information of the targets.Experimental results show that the average reconstruction error of the Doppler frequency is 5.33 kHz using an 8-μs radar signal under the compression ratio of 5.The proposed method provides a promising solution for the sub-Nyquist radar receiver.

关 键 词：compressed sensing dictionary learning sub-Nyquist radar microwave photonics Doppler frequency 

分 类 号：TN957.5[电子电信—信号与信息处理]