A Joint Calibration Method for Spaceborne Optical Camera-Laser Range Finder Combination System

Abstract

The invention discloses a joint calibration and adjustment method for a satellite-borne optical camera-laser range finder combined system. According to the method, geometric correlation between a satellite-borne optical camera and a satellite-borne laser range finder is built by using a geometrical relationship of an internal structure of the satellite-borne optical camera-laser range finder combined system, a joint calibration and adjustment model based on an optical stereoscopic image observation equation and a laser ranging observation equation is built, high-precision estimation of orientation elements in the optical camera an relative orientation elements between the laser range finder and the optical camera can be achieved at the same time, and the influence of a system error is automatically compensated, thereby fully developing the advantages of the combined system in three-dimensional positioning of a ground target.

Description

technical field [0001] The invention relates to the technical field of geometric processing of optical surveying and mapping satellite data, in particular to a joint calibration method of a spaceborne optical camera-laser rangefinder combination system, which is applied to on-orbit geometric calibration and ground target positioning of a satellite photogrammetry system. Background technique [0002] In recent years, my country's satellite remote sensing surveying and mapping technology capabilities have developed rapidly, but there is still a gap compared with the international advanced level. On the basis of the current domestic satellite payload development capabilities, by designing a combined system of different functional payloads, using data post-processing technology to extract high-precision target geographic information, it can reduce the difficulty of hardware development, shorten the development cycle, and meet the application requirements. It is a feasible way to...

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Problems solved by technology

However, the distance observation equation has nothing to do with the camera's outer azimuth angle element, and the data correlation between the optical camera and the laser rangefinder is weak, and there are certain deficiencies

[0007] In particular, it should be noted that if the system error within the combined system cannot be eliminated in the actual data processing, not only will the actual positioning accuracy not be improved, but the positioning accuracy will be seriously damaged, even lower than the positioning accuracy obtained by a single technical means. As a result, the advantages of system combination positioning cannot be reflected

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