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Sensors 2018, 18(3), 854; https://doi.org/10.3390/s18030854

A Non-Cooperative Satellite Feature Point Selection Method for Vision-Based Navigation System

Research Center of Satellite Technology, Harbin Institute of Technology, Harbin 150080, China
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Received: 11 February 2018 / Revised: 9 March 2018 / Accepted: 10 March 2018 / Published: 14 March 2018
(This article belongs to the Section Remote Sensors)
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Abstract

The number of feature points on the surface of a non-cooperative target satellite used for monocular vision-based relative navigation affects the onboard computational load. A feature point selection method called the quasi-optimal method is proposed to select a subset of feature points with a good geometric distribution. This method, with the assumption that all of the feature points are in a plane and have the same variance, is based on the fact that the scattered feature points can provide higher accuracy than that of them grouped together. The cost is defined as a function of the angle between two unit vectors from the projection center to feature points. The redundancy of a feature point is calculated by summing all costs associated with it. Firstly, the feature point with the most redundant information is removed. Then, redundancies are calculated again with the second feature point removed. The procedures above are repeated until the desired number of feature points is reached. Dilution of precision (DOP) represents the mapping relation between the observation variance and the estimated variance. In this paper, the DOP concept is used in a vision-based navigation system to verify the performance of the quasi-optimal method. Simulation results demonstrate the feasibility of calculating the relative position and attitude by using a subset of feature points with a good geometric distribution. It also shows that the feature points selected by the quasi-optimal method can provide a high accuracy with low computation time. View Full-Text
Keywords: non-cooperative satellite; feature point selection; vision-based navigation system; quasi-optimal method non-cooperative satellite; feature point selection; vision-based navigation system; quasi-optimal method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Ning, M.; Zhang, S.; Wang, S. A Non-Cooperative Satellite Feature Point Selection Method for Vision-Based Navigation System. Sensors 2018, 18, 854.

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