In-orbit geometrical self-calibration method for multi-mirror aerospace linear array camera system

Abstract

The invention relates to an in-orbit geometrical self-calibration method for a multi-mirror aerospace linear array camera system, and the method can be used for excavating and improving the measurement property of a sensor, so as to meet the actual requirements of photographic surveying and positioning precision of an aerospace linear array camera and surveying of a military topographic map. The in-orbit geometrical self-calibration method comprises the basic steps of: firstly, arranging and measuring a high-precision surface mark control point in a calibration and test area, and obtaining a ground geometrical nominal parameter of the camera system; secondly, obtaining satellite in-orbit flying orbit data, and measuring an image point coordinate corresponding to the mark control point on a corresponding image of a test domain, which is shot by a sensor system; and finally, using a self-calibration balancing technology of a least squares light beam method to calculate parameter correction to influence the geometrical positioning precision of the camera system, so as to improve the measurement properties of the sensor system. Shown by tests, the in-orbit geometrical self-calibration method provided by the invention has the advantages of being better in reliability and higher in precision, and obviously improving the ground position geometrical precision effects of the sensor.

Description

technical field [0001] The invention relates to a method for calibrating and correcting geometrical systematic errors of a multi-lens space line array sensor carried by a satellite in orbital flight state, and belongs to the technical field of space photogrammetry and remote sensing surveying and mapping. Background technique [0002] Line scan sensors can be divided into single-lens and multi-lens sensors according to the number of lenses. In order to perform three-dimensional intersection, usually, single-lens sensors will arrange multiple parallel linear array CCDs on the focal plane, while multi-lens will be on the A (group) linear array CCD is arranged on the focal plane of each individual camera. This difference in structural design determines that the system error of the sensor and the on-orbit calibration are different in both the geometric imaging model and the data processing method. [0003] In recent years, domestic aerospace photogrammetry line array cameras ar...

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At present, domestic research in this area is almost blank, and no similar or identical methods have appeared.

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