关于调频连续波测距信号的研究  

Study on signal of frequency modulated continuous wave ranging

作　　者：李光[1] Li Guang(Southwest China Institute of Electronic Technology,Chengdu 610036,China)

机构地区：[1]中国西南电子技术研究所,四川成都610036

出　　处：《电子技术应用》2025年第3期77-80,共4页Application of Electronic Technique

摘　　要：调频连续波测距信号的频率参量随时间规律性周期变化,使得对其进行传统的时域和频域分析都很复杂,且难于理解。通过对于差频信号相位进行分析,证明静态调频连续波测距差频信号是周期信号,频谱是离散的,差频信号能量分散在各次谐波上,各次谐波分量是由频偏、距离和调制周期共同决定的。当存在径向相对运动时,差频信号频谱存在多普勒频移,当多普勒频移不是原周期重复频率的整数倍时,差频信号不再是周期信号。That the frequency of frequency modulated continuous wave(FMCW)signal varies periodically makes the traditional time-frequency analysis very difficult and crabbed.The phase of the beat signal is analyzed in this paper.The beat signal is proved to be periodical and its spectrum is discrete.The power is distributed to all the harmonics.The weight of each harmonic depends on frequency deviation,distance,modulation period.When the target moves in radial direction,spectrum of beat signal is influenced by Doppler effect and becomes nonperiodic when the Doppler shift is not an integral multiple of original repetition frequency.

关 键 词：调频连续波 差频 测距 信号分析 

分 类 号：TN958.94[电子电信—信号与信息处理]