On-orbit geometric calibration method of optical remote sensing camera

Abstract

An on-orbit geometric calibration method of an optical remote sensing camera aims at a domestic satellite platform and load design characteristics to build a strict imaging model, and uses an internal and external orientation element combination modeling method for geometric calibration treatment. The method is based on the strict imaging model for the geometric calibration treatment, and model parameters have clear physical meanings; 2) simultaneous decoupling of internal and external orientation elements can be realized by internal and external orientation element combination modeling; 3) the model can be used for a multiple linear array camera and multi-camera combination calibration, and has a strong universality; 4) according to the method, various factors causing image distortion in an imaging process can be fully considered, and high precision can be achieved.

Description

technical field [0001] The invention belongs to the field of on-orbit geometric calibration of domestic remote sensing satellites, and is suitable for linear array push-broom optical CCD remote sensing cameras. Background technique [0002] With the development of my country's aerospace technology, the spatial resolution of domestic remote sensing satellites has gradually improved, and the actual positioning accuracy of remote sensing images has become an important inspection index. The linear push-broom optical remote sensing camera is a main optical remote sensing satellite payload. The on-orbit calibration of its internal and external azimuth elements can reduce image distortion and improve the accuracy of image-to-ground positioning. [0003] Judging from the current published articles and public information, in the field of domestic remote sensing camera inspection and comparison, in the geometric calibration of optical remote sensing cameras, the main research work foc...

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Problems solved by technology

[0003] Judging from the current published articles and public information, in the field of domestic remote sensing camera inspection, in terms of geometric calibration of optical remote sensing cameras, the main research work focuses on the calibration of technical parameters of ground and aerial photogrammetry cameras, and most of them focus on the calibration of traditional frames. In-depth research on the field camera; and a small amount of research on the on-orbit geometric calibration of aerospace line array cameras is to use a mathematical model to fit the image distortion caused by the change of the internal and external azimuth elements, which cannot be used in the imaging process. The parameters are calibrated, and the calibration accuracy cannot meet the predetermined requirements, and there is an order of magnitude gap with the international level.

[0004] In foreign countries, many high-resolution optical remote sensing satellites have been launched, such as IKONOS, Quickbird, WordView-1 / 2, Geo-eye, and Pleiades, etc., and corresponding on-orbit geometric calibration technical solutions have been formed. Brief description only, no technical details disclosed

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