南京大学学报（自然科学版）Issue(3)：356-360,5.DOI:10.13232/j.cnki.jnju.2014.03.016
基于多通道补偿的毫米波雷达高速目标检测方法
High-speed target detection of millimeter wave radar based on multi-channels compensation
摘要
Abstract
The target detection is an important task of radar systems.The detection performance of radar system can be improved by long-term signal integral when the signal to noise ratio(SNR)is low.However,with the development of aerospace technology,the target’s velocity becomes higher and higher.Also the target’s radar cross-section becomes smaller and smaller which results in SNR coming down.For the detection of high-speed targets,there would be serious echo range migration between the adjacent repeat intervals of the radar which will interference the method of coherent integration to improve the SNR.There would be coupling between frequency and the number of echo after the echo coherent integration.This coupling will give rise to the echo range migration in the time-domain when the target’s velocity is high.For the problem of high-speed target detection in radar system,this paper puts forward a new method based on multi-channels compensation.This method is aimed at diminishing the effect of the coupling and sets several channels to compensate velocity which reduces the coupling of the system in a certain channel.Therefore,the echo in the time-domain will have lower range migration or even no range migration.After speed compensation,the radar system compares the output of each channel,and transfers the maximum one of the output of the channel to the threshold detector which has the threshold value in advance.Then radar system estimates whether the target exits.The threshold value is chosen based on statistical property of Gaussian noise which meets the false detection probability when the input signal contains only Gaussian noise;the output signal should also have the characteristics of Gaussian noise.This method does not need to estimate the speed before targets detection and just need to determine the speed scope roughly.At the same time,the transmitting and receiving model of the millimeter wave radar is structured with the help of Matlab.Then the received signal is com-pensated through multi-channels.Theoretical and simulation results demonstrated that the method based on multi-channels compensation can effectively detect the high-speed targets and increase the SNR by 7 dB compared with the method based on coherent integration.So this method improves the detection performance.关键词
信号检测/高速目标/毫米波雷达/相参积累Key words
signal detection/high-speed targets/millimeter wave radar/coherent integration引用本文复制引用
戴作宁,张兴敢,唐岚,柏业超..基于多通道补偿的毫米波雷达高速目标检测方法[J].南京大学学报（自然科学版）,2014,(3):356-360,5.基金项目
江苏省产学研前瞻性联合研究项目(BY2012187) （BY2012187）
