对脉冲激光雷达外差测距信号进行了研究 ,理论上 ,采用调Q激光脉冲的数值计算波形 ,研究了脉冲激光经远处目标漫反射后进行外差接收的波形及其傅里叶变换频谱成分。实验上 ,研究了可调谐电光调Q射频激励波导CO2 激光器脉冲激光经目标反射后的外差波形及其傅里叶变换频谱成分 ,并计算了目标的距离 ,理论分析与实验结果一致 The pulsed lidar heterodyne ranging signal was studied. In theory, the waveform of the Q-switched laser pulse was numerically calculated. The waveform of the heterodyne received by the pulsed laser and the Fourier transform spectrum ingredient. Experimentally, the heterodyne waveforms and their Fourier transform spectral components of the tunable electro-optical Q-switched RF laser-guided CO2 laser pulsed laser were studied. The distance of the target was calculated. The theoretical analysis is consistent with the experimental results