Balance coherent detection technology of coherent lidar

In order to analyze the influence factors of signal-to-noise ratio(SNR) of balanced coherent detection, balanced coherent detection process was studied and the SNR formula was derived based on the mathematical model. A balanced laser detector for signal receiving was developed, and Mie scattering echo signal of aerosol particles was detected by means of the coherent radar prototype. The results show that balanced laser detector is with very low noise and high sensitivity, and can detect the laser echo signal of Mie scattering of aerosol particles.