Analysis impact and verification of gravity on receiving optical axis of the active-passive multichannel LiDAR

“Gou Mang” Terrestrial Ecosystem Carbon Inventory Satellite is China’s first forestry remote sensing satellite with an active LiDAR as the main payload. As the Active-passive payload, the multi-channel Carbon Sinks and Aerosol LiDAR(CASAL)’s stability of the receiving optical axis is one of the keys to success. Gravity is the key influencing factor, which is impacting on ground installation and testing results. Considering the consistency between the space and earth, it is necessary to ensure that the design minimizes impact of gravity deformation on the stability of the receiving optical axis. This article discusses the optimization design ideas of the optical and mechanical system, the analysis and experimental verification of the receiving optical axis of CASAL. The result indicates that the simulation analysis is consistent with the experimental verification result. Currently the CASAL is operating well in space. The information can provide helpful reference for subsequent loads.