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采用相干多普勒测量手段获取目标面型变化信息具有明显的优势。基于激光多普勒效应,设计一套多普勒成像激光雷达实验系统,同时引入APFFT全相位测相处理思路对外差信号进行时频分析,抑制频谱泄露,减小噪声对测量结果的影响,获取高测量精度信号时频曲线。在MATLAB软件simulink交互式仿真集成环境中进行过程仿真,证明其可以实现对扫描空间高分辨率、高精度的成像。实验结果表明:该系统能够较好还原被测目标表面特性,为激光雷达实现对目标高分辨率与高灵敏度成像提出新的解决思路。
Obtaining the information of the change of target surface by means of coherent Doppler measurement has obvious advantages. Based on the laser Doppler effect, a set of Doppler imaging lidar system was designed. At the same time, APFFT phase-phase measurement was introduced to time-frequency analysis of heterodyne signals to suppress spectrum leakage and reduce the influence of noise on the measurement results. High measurement accuracy signal time-frequency curve. Process simulation in simulink interactive simulation integrated environment of MATLAB software proves that it can realize high resolution and high precision imaging in scanning space. The experimental results show that the system can restore the surface characteristics of the measured target well and propose a new solution for the high resolution and high sensitivity imaging of the target by the laser radar.