Analysis of fog suppression effect of FMCW laser detection baseline

摘要

Fog backscattering can cause false alarm for laser detection , especially multiple scattering of cloud and fog nearby the lidar. By setting up the receiving and transmitting field of view, a close range blind area can be generated to suppress the interference of near cloud and fog. As frequency modulated continuous wave ( FMCW ) laser detection has the advantage of anti-interference, the research on FMCW laser detection has been carried at at home and abroad, but the influence of detection baseline on the effect of FMCW laser detection Has not been studied. The fog and the target echo characteristics are simulated based on the Monte Carlo method. Then the echo spectrum and the calculation value of target distance under different baseline conditions are given. The influence of detection baselines on fog suppression ability of FMCW laser detection is analyzed. The simulation results show that the larger the distance between transmitting and receiving is, the The more prominent the peak of the intermediate frequency signal is, the less obvious the frequency aliasing is. The analysis results conform to the scattering law of cloud and fog on beam propagation, which can provide a basis for target recognition of laser detection and optimal design of Transmitting and receiving field parameters.