LFMCW雷达频率源扫频线性度与距离分辨率研究  

Analysis of Frequency Sweep Linearity Error and Range Resolution of LFMCW Radar

作　　者：申江江 何勰 于志军 孙永芹 何波贤 赵成斌 SHEN Jiangjiang;HE Xie;YU Zhijun;SUN Yongqin;HE Boxian;ZHAO Chengbin(The No.91206st Troop of Naval Aviation University, Qingdao 266000, China)

机构地区：[1]海军航空大学91206部队,山东青岛266000

出　　处：《兵器装备工程学报》2020年第11期95-99,共5页Journal of Ordnance Equipment Engineering

基　　金：中国博士后科学基金一等资助项目(2014M562558)。

摘　　要：根据线性调频连续波(linear frequency-modulated continues wave,LFMCW)雷达差频信号特性,结合调相理论分别分析了扫频线性度误差和接收机频率分辨率对距离分辨率的影响,进行了X波段频率源设计。根据所设计的频率源测试数据对线性度误差函数进行了拟合,将此函数代入差频信号模型并进行FFT变换,验证了扫频线性度误差对距离分辨率的影响,并对加窗处理结果进行了分析。结果表明:加窗处理对压低频谱旁瓣的作用明显,对目标探测有改良效果。Based on the traits of beat frequency of linear frequency-modulated continues wave radar signal,this paper analyzed the effects of the linearity error and the receiver frequency resolution on the deterioration of range resolution.The model of the linearity error was given on the basis of frequency modulation signal theory of LFMCW radar.The above analysis was applied to the design of X-band frequency source of the LFMCW radar.Then the measurement data from the X-band frequency source were used in the fitting of the sweep linearity error function,which is added to the beat frequency signal model.By using the Fast Fourier Transform in the processing of the beat frequency,the effect of the sweep linearity on the range resolution was verified.The analysis of Hanming windowing in the signal processing was discussed.The results show that windowing treatment has an obvious effect on suppressing the sidelobe and has an improved effect on target detection.

关 键 词：LFMCW雷达 频率源 距离分辨率 扫频线性度 接收机频率分辨率 

分 类 号：TN958[电子电信—信号与信息处理]