A method for on-orbit pointing calibration of spaceborne laser based on waveform matching

Abstract

The invention discloses a waveform matching-based on-orbit pointing calibration method of spaceborne laser. The method includes the following steps: carrying out echo waveform simulation of a spaceborne laser altimeter on the basis of airborne lidar (Light Detection And Ranging) data; matching a real waveform according to an obtained simulation waveform, and determining foot point centroid coordinates of the spaceborne laser according to a method of matching the real waveform by the simulation waveform; and calibrating a pointing angle of the spaceborne laser according to a geometric calibration model of the spaceborne laser altimeter and the foot point centroid coordinates of the laser. According to the calibration method, the simulation waveform is adopted to match the real waveform, thus a foot point centroid position of the laser is quickly determined, and the purpose of on-orbit pointing calibration of the spaceborne laser altimeter is achieved. By using the calibration method, ground detectors are no longer relied on, only the existing airborne lidar data need to be used, and field operation cost can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of on-orbit geometric calibration of space-borne lasers, in particular to a method for on-orbit pointing calibration of space-borne lasers based on waveform matching, which is applied to high-precision geometric positioning of space-borne lasers. Background technique [0002] Geometric positioning accuracy is the most important indicator to measure the performance of domestic surveying and mapping satellites, among which elevation accuracy is more important because it is difficult to improve. LiDAR (Light Detection And Ranging, referred to as LiDAR) has the characteristics of good directionality, high coherence, good monochromaticity, and high ranging accuracy. It has great application potential in the fields of deep space exploration and earth science. Onboard laser altimetry technology is applied to high-resolution optical three-dimensional surveying and mapping satellites, assisting space photogrammetry t...

AI Technical Summary

Problems solved by technology

Each method has its own advantages and disadvantages. The ground detector calibration method has a high success rate and high precision, but requires a lot of manpower and material resources.

The accuracy of the airborne infrared camera imaging calibration method is high, but the imaging is difficult due to the low attenuation of the laser energy when it reaches the surface. At the same time, it is difficult to control the synchronous transit time of the satellite and the aircraft, and the success rate is low.

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