A Measuring Method of Rotation Axis and Rotation Angle of Non-cooperative Target

Abstract

The invention provides a method for measuring the rotation axis and the rotation angle of a non-cooperative target. The method is used for obtaining the rotation axis and the rotation angle of the target in a rotation state. The method includes the following steps: S1, acquiring a target image sequence at different moments, and extracting target feature affine invariants in the target image sequence to obtain a target affine invariant set; S2, carrying out frame matching on the target affine invariant set to obtain the feature invariant pair set of the target, respectively tracking the position of every feature point in the feature invariant pair set, and performing quadratic curve fitting on every feature point to obtain multiple fitted conic results; S3, selecting feature invariant pairs on any two images, calculating a basic matrix, and solving the direction of the rotation axis of the target; and S4, solving the rotation angle of the target through basic matrix of a round dot and polar line relation according to the obtained direction of the rotation axis of the target. The method improves existing artificial and semi-automatic recognition technologies, increases the work efficiency and ensures the processing timeliness.

Description

technical field [0001] The invention relates to the technical field of satellite detection and identification and on-orbit service, in particular to a method for measuring the rotation axis and rotation angle of a non-cooperative target. Background technique [0002] With the increasing complexity of on-orbit service tasks for targets, the demand and requirements for accurate on-orbit position and attitude measurement technology for targets are rapidly increasing, and the types and states of targets to be measured are different. The general target targets are stationary and In the slow-rotation state, the estimation of the target rotation axis is generally completed by combining multi-source observation data. [0003] When measuring the rotation axis and rotation angle of the target, the main structure is judged based on the known configuration of the target, the main structure predicted on the target image is identified, and the feature is tracked and extracted stably for a...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a non-cooperative target rotation axis and rotation angle measurement method, using the rotation axis and rotation angle measurement method based on feature invariant extraction, feature matching and motion equation solution to obtain the target rotation state parameter results , improving the existing manual and semi-automatic identification technology, improving work efficiency and ensuring the timeliness of processing, and solving the problem of requiring prior knowledge and low accuracy when measuring the rotation state of the watch during on-orbit service

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