Spaceborne integrated path differential absorption (IPDA) lidar is an active-detection system which is able to perform
global CO2 measurement with high accuracy of 1ppmv at day and night over ground and clouds. To evaluate the
detection performance of the system, simulation of the ground return signal and retrieval algorithm for CO2
concentration are presented in this paper. Ground return signals of spaceborne IPDA lidar under various ground surface
reflectivity and atmospheric aerosol optical depths are simulated using given system parameters, standard atmosphere
profiles and HITRAN database, which can be used as reference for determining system parameters. The simulated
signals are further applied to the research on retrieval algorithm for CO2 concentration. The column-weighted dry air
mixing ratio of CO2 denoted by XCO2 is obtained. As the deviations of XCO2 between the initial values for simulation
and the results from retrieval algorithm are within the expected error ranges, it is proved that the simulation and retrieval
algorithm are reliable.
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