Comparison And Analysis Of Measurement Performance Simulation Of Space-borne Wind Lidar Based On Lodine And F-P Filter

Space-borne wind iidar is the most effective method to derive three-dimension global wind field, and its data products can be the complement to data of Numeric Weather Prediction and Atmospheric Dynamics. Because of the high cost of satellite launch, pre-research is very important, and software simulation of the system is one kind of it. ESA (European Space Agency) and NASA (National Aeronautics and Space Administration) has been developing simulation of space-borne wind lidar for long time.This thesis aims at simulation of space-borne wind lidar. Two kinds of frequency discriminators used in incoherent detection are Fabry-Perot (F-P) filter and iodine filter. The simulation is developed with two systems (space-borne wind lidar based on 355nm Fabry-Perot (F-P) filter and 532 nm iodine filter respectively) according to them. Simulation results are analyzed with other system parameters, and used to compare simulation performance of these two kinds of frequency discriminator applied in space-borne wind lidar system.Firstly this thesis analyzed simulations of spaceborne wind lidar undertaken by other researchers already. Then the interaction of atmosphere and laser, principle of wind lidar and its detection methods are described. And Theory of F-P and iodine filter is discussed respectively. Then the technology about the simulation is introduced, such as atmospheric model, parameters of lidar system (transmitter part and receiving part), satellite platform and data processing methods.In the main part of this thesis, theoretically simulated performances of space-borne wind lidar based on F-P and iodine filter are analyzed. The results shown that iodine filter has obvious advantage of wind measurement for altitude of Okm to 5km, especially where aerosol dominates. And for upper altitude, wind uncertainty of iodine filter system to F-P filter system is about 4:3.After that simulations of F-P and iodine filter svstems with other hardware parameters are developed and the results are analyzed. For F-P filter, simulation of space-borne wind lidar ALADIN (ESA) is undertaken at first to verify the F-P simulation algorithm, then the 355nm space-borne system based on F-P filter crossover point is simulated, its results indicated that the wind speed accuracy of horizontal wind field is 3m/s, and horizontal distance resolution is 130km when the laser power (355nm) is 15W and accumulated pulses of each scanning angle is 900. For iodine system, simulation of mobile wind lidar of Ocean University of China is investigated to verify iodine simulation algorithm, then simulation of 532nm space-borne system based on iodine filter is developed. And this system's wind speed accuracy of horizontal wind field is 3m/s at 20km and horizontal distance resolution is 180km when the laser power (532nm) is 35W and accumulated pulses of each scanning angle is 1300.Finally, simulation results and technology requirements are combined to synthetically compare performance of iodine filter and F-P filter. This research will provide evidence for consideration of candidate of Chinese space-borne wind lidar.