Study on Error of Lidar Extinction Coefficient Based on Scattering Ratio Iteration Method

Raman-Mie scattering lidar is widely used to monitor atmospheric aerosols, but there are still some errors in the detection of bottom echo signals. Fernald method is one of the most widely used methods to calculate atmospheric aerosols, but it is difficult to determine the atmosphere its boundary value. The boundary value of backscattering coefficient can be calculated better by using scattering method than by iteration method, but there are still some errors. By combining the Fernald method with the optimization of the laser radar constant and the optimization of the iteration algorithm, an optimization method for selecting the calibration value is proposed without loss of accuracy. The new extinction profile is retrieved and its noise is analyzed. The relative error and defects of this method are proposed, which provides a reference for the calculation of extinction coefficient in the future.