17 November 2014 Ground return signal simulation and retrieval algorithm of spaceborne integrated path DIAL for CO2 measurements
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Abstract
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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Bing-Yi Liu, Bing-Yi Liu, Jun-Yang Wang, Jun-Yang Wang, Zhi-Shen Liu, Zhi-Shen Liu, } "Ground return signal simulation and retrieval algorithm of spaceborne integrated path DIAL for CO2 measurements", Proc. SPIE 9262, Lidar Remote Sensing for Environmental Monitoring XIV, 926204 (17 November 2014); doi: 10.1117/12.2069265; https://doi.org/10.1117/12.2069265
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