Model constraint-based on-orbit 3D space target attitude estimation method and system

Abstract

An attitude estimation method for an on-orbit three-dimensional space object, comprising an off-line feature library construction step and an on-line attitude estimation step, wherein the off-line feature library construction step comprises: according to a space object three-dimensional model, acquiring object multi-viewpoint characteristic views, and extracting geometric features from each space object multi-viewpoint characteristic view to form a geometric feature library, the geometric feature library containing the depth-width ratio of an object body, the degree of longitudinal symmetry of an object, the degree of horizontal symmetry of the object and the angle of inclination of a main axis of the object; and the on-line attitude estimation step comprises: pre-processing an on-orbit object image to be detected and extracting features, and matching the extracted features in the geometric feature library, so that an object attitude characterized by the characteristic view corresponding to a matching result is an attitude estimation result. The dimension scale and position relationship between various components of an object are accurately acquired in a three-dimensional modeling stage, thereby ensuring subsequent higher matching accuracy. Also provided is an attitude estimation system for an on-orbit three-dimensional space object.

Description

technical field [0001] The invention belongs to the intersecting field of aerospace technology and pattern recognition, and in particular relates to a method and system for estimating the attitude of three-dimensional space objects in orbit such as satellites and space vehicles. Background technique [0002] A large number of space targets such as communication satellites and resource satellites launched at home and abroad can be used in applications such as network communication, aerial photography, and geodesy. It is an indispensable part of this type of system to conduct ground-based photoelectric observation of these space targets, analyze and adjust their attitude. Due to the limited spatial resolution of the ground-based telescope system and the random interference of the atmospheric environment on long-distance optical imaging, the images acquired by ground-based sensors are prone to blurred target boundaries. When the boundary of the imaging target is blurred, the a...

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Problems solved by technology

[0004] In order to solve the problems of large amount of calculation, poor precision, or poor adaptability of the existing methods, the present invention provides an on-orbit three-dimensional space target attitude estimation method and system, which can effectively estimate the three-dimensional space of the target from the two-dimensional image of the space target Attitude information, high precision, small amount of calculation, good adaptability

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