LiDAR System Test Data Processing And Evaluation

Lidar is becoming more and more common in life.As a detection system that combines the advantages of high-precision measurement and long-distance radar detection capabilities,it is widely used in the field of high-precision surveying and mapping with the strong anti-interference ability of laser,and it is also used in deep space detection.And the field of earth observation plays an irreplaceable role.The spaceborne lidar system uses satellites in orbit as the carrier,with a high position and wide field of view,capable of covering all positions of the star under test and providing effective absolute elevation values for the satellite.Therefore,how to test the lidar system and accurately calculate the measured distance has become the focus of research.Based on the analysis of the principle of lidar ranging and the principle of full-waveform testing technology,in order to achieve the performance evaluation of the complete link of the space-borne lidar ranging system,the research realizes the work and research on the data acquisition and test processing algorithms of the full-waveform main echo signal.Firstly,clarify the difference between the space-borne lidar system and the ground-based lidar system,and further propose improved testing techniques.The system-level analysis of the pulsed full-wave lidar test system is completed from two aspects: the testing principle of the ranging capability of the lidar system and the ranging accuracy error analysis of the lidar system.Secondly,the research and realization of full waveform test data processing are carried out.A complete set of processing flow and evaluation of echo waveform data is designed,including the use of sliding window filtering for echo waveform recognition,matched filter technology for echo waveform extraction and echo waveform evaluation,and realizing the accuracy of echo waveforms extraction and quality evaluation,and finally calculate the waveform centroid solution distance.Compared with the first generation spaceborne lidar threshold waveform identification technology,the accuracy of the distance calculation is improved.Finally,this article obtains the test data through the designed data acquisition module and processes it.The results show that the actual ranging value obtained through the full waveform data processing procedure proposed in this paper can verify the ranging capability index of the spaceborne lidar system through statistics.The evaluation of the echo of the spaceborne lidar system by using the echo waveform quality evaluation weight formula lays a foundation for the spaceborne lidar system to verify the ranging index through the preliminary ranging performance test before launch.