车载分布式雷达相参处理方法研究  

Research on Coherent Processing Method of Distributed Automotive Radar

作　　者：齐博文 梁灿 胡雪瑶 李阳[1,2] 王彦华 QI Bowen;LIANG Can;HU Xueyao;LI Yang;WANG Yanhua(Radar Research Laboratory,School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Technology Chongqing Innovation Center,Chongqing 401120,China;Beijing Key Laboratory of Embedded Real-time Information Processing Technology,Beijing 100081,China)

机构地区：[1]北京理工大学信息与电子学院雷达技术研究所,北京100081 [2]北京理工大学重庆创新中心,重庆401120 [3]嵌入式实时信息处理技术北京市重点实验室,北京100081

出　　处：《信号处理》2022年第2期309-318,共10页Journal of Signal Processing

基　　金：国家重点研发计划(2018YFE0202101,2018YFE0202102,2018YFE0202103);中国博士后科学基金(2021M690412);重庆市自然科学基金(cstc2020jcyj-msxmX0812);重庆市博士后科研项目特别资助(2021ZX3200002)。

摘　　要：城市道路环境中行人、路障等弱目标回波信噪比低,传统车载雷达对其探测能力有限。本文将分布式体制应用于车载雷达,通过对多雷达回波相参积累,以期提高目标信噪比,改善雷达探测能力。相参参数估计是实现车载分布式雷达相参积累的关键,本文针对车载分布式雷达脉间相位编码波形非理想正交,导致传统相参参数估计方法精度低的问题开展研究,提出了一种时延参数与相位参数分步估计的高精度相参参数估计方法。首先根据回波正交性分离各通道回波,随后根据目标时空位置估计通道间时延参数,然后利用时延参数补偿回波,在各通道目标位置对齐后,估计各通道相位参数。仿真与实测结果表明,相比于传统相参参数估计方法,本文方法有效提升了脉间相位编码波形的相位参数估计精度。In the urban road environment,the signal-to-noise ratio of the target echoes such as pedestrians and roadblocks are low,which leads to low detection performance for conventional automotive radar.In this paper,the distributed coherent array is applied to the automotive radar,and the target signal-to-noise ratio is improved through the coherent accumulation of multiple radar echoes,thereby enhancing the detection performance of automotive radar.Coherent parameter estimation is the key to realize coherent accumulation of distributed automotive radar.However,non-ideal orthogonal of inter-pulse phase encoding waveform will lead to the low accuracy of traditional coherent parameter estimation methods.To solve above problem,a coherent parameter estimation method is proposed for the stepwise estimation of delay parameters and phase parameters.First,the echoes of each channel are separated according to their orthogonality.Then,the delay parameters between channels are estimated based on the position of the target.Afterwards,the delay parameter compensation is used.Finally,after the target position of each channel is aligned,the phase parameters of each channel are estimated.Simulation and experiment show that compared with traditional coherent parameter estimation methods,the phase parameter estimation accuracy of the proposed method is higher.

关 键 词：分布式体制 汽车雷达 相参参数估计 相参积累 

分 类 号：TN958.94[电子电信—信号与信息处理]