The Influence of Satellite Micro-vibration on the SNR of Coherent Wind LiDAR

Abstract

The measurement of atmospheric wind field is of great significance for global climate change, offshore storm detection, daily weather forecast accuracy and even national military security. Space-based coherent wind radar is widely concerned with its high temporal resolution, high spatial resolution, high sensitivity and small volume. The micro-vibration disturbance source exists in most spacecraft, which has a certain influence on the signal to noise ratio (SNR) of coherent wind lidar. Based on the analysis of the principle of coherent wind lidar system, the influence of satellite micro-vibration on SNR of coherent wind lidar is analyzed by taking a satellite micro-vibration data as sample. The experimental results show that the satellite micro-vibration has a certain influence on the SNR of the coherent wind lidar. While the mismatching angle is 3.77 μrad, the optimal aperture of the telescope decreases from 1.75 m in the ideal case to 0.45 m, The SNR is between −1.5 dB~1.36 dB, which is within the acceptable range. The research content of this paper can provide theoretical basis for the design of the satellite platform of coherent wind lidar.