On-orbit self-calibration method for space target relative navigation vision measurement system

Abstract

An on-orbit self-calibration method for a space target relative navigation vision measurement system comprises the following steps: establishing the space target relative navigation vision measurementsystem based a pinhole camera model; obtaining an internal and external parameter expression for the space target relative navigation vision measurement system by using an identified common feature point in a group of corresponding images in an image sequence; further obtaining an ideal constraint equation for the internal and external parameter expression by using the characteristics of a rotation matrix; and constructing the error function of the ideal constraint equation as an objective function, preliminarily obtaining parts of parameters of the space target relative navigation vision measurement system through optimization using a particle swarm algorithm having a fast calculation speed, and obtaining all remaining parameters through further optimization based on the internal and external parameter expression for the space target relative navigation vision measurement system in order to achieve the on-orbit self-calibration method for the space target relative navigation vision measurement system.

Description

technical field [0001] The invention relates to an on-orbit self-calibration method for a space target relative navigation visual measurement system, which is used for on-orbit self-calibration of internal and external parameters of the relative navigation visual measurement system for the on-orbit working process of the space target relative navigation visual measurement system. Background technique [0002] With the rapid development of aerospace technology, the structure and composition of space vehicles have become increasingly complex, and the performance and technical level have been continuously improved. More and more space vehicles have proposed more durable, stable and high-quality in-orbit operation The space on-orbit service technology has become an important problem to be solved in the field of aerospace technology. [0003] In the short-distance approach segment of the on-orbit service spacecraft, it is necessary to comprehensively detect and estimate the relat...

AI Technical Summary

Problems solved by technology

The advantage of this method is that the algorithm is simple and can often obtain a linear solution, but the disadvantage is that it cannot be applied to occasions where the camera motion is unknown or uncontrollable.

[0004] For the application environment of space missions, the visual measurement system has problems such as the change of camera parameters caused by the space environment after entering orbit, the inability of humans to participate in the calibration of spacecraft in orbit, the degradation of camera parameters in long-term orbit, and the low reliability of active vision in space missions. Autonomy, flexibility and practicability requirements are put forward for the visual measurement system

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