Research On Spaceborne Lidar Echo SimulationTechnology Based On Topography

Lidar measurement technology is a new remote high-precision measurement technology.It not only has good directional laser, monochrome and strong anti-interference ability and other characteristics to achieve high-precision control and on-site measurements,but also has long-range radar detection capability.so it can be widely used in stars topographic survey and the National Geographic Information Mapping. Space-borne Lidar uses a satellite as a carrier of the measurement system,due to the high orbital position and extensive field of vision, it can fully cover each position of stars terrain.According to the background, this paper established a complete set of terrain echo simulation theory.Firstly, a brief introduction of the Space-borne Lidar technology research background andresearch development present situation at home and abroad.Secondly, before the establishment of the terrain echo simulation algorithm, systematically introduced the composition of space-borne laser radar ranging system structure and working principle, take GLAS for example. Then, we separately used mathematical modeling to simulate the echo from three different terrains, such as common terrain, positive and negative terrains, and general terrain.Finally, combining with the experimental results, based on the terrain features, summarizes the relationship between terrain parameters and echo waveform. In aspects of theoretical algorithms and error analysis, this thesis firstly conducted the echo waveform characteristics of positive and negative terrains,with an emphasis on the general theory echoes terrain surface modeling and simulation.In terms of data processing and algorithm validation, comparing the simulation results with high precision GLAS system in same areas based on the actual terrain data which obtained from airborne radar.The results of this article provide theoretical foundation for information analysis of more-refined terrains and combined treatment of laser altimetry data and the optical image, and also provide a technology reference for the development ofChina’snew generation of civil mapping satelliteson related indicators.