A method for optical cooperative orbit determination of small celestial bodies around detectors

Abstract

The invention discloses a method for optical cooperative orbit determination of a small celestial body surrounding a detector, which belongs to the technical field of deep space detection. The realization method of the present invention is as follows: the position and velocity vectors of the two detectors are regarded as state variables to be estimated, and an optical cooperative orbit determination state model is established in the small celestial body fixed-connected coordinate system; the camera of the observation detector images the observed detector , to obtain the pixel information of the observed detector in the phase plane, combined with the known attitude of the observed detector, to establish an observation model for optical cooperative orbit determination; use the nonlinear navigation filtering algorithm to coordinate the position and velocity vector of the two detectors It is estimated that the optical cooperative orbit determination of small celestial bodies around the detector will be realized. The present invention includes but is not limited to two detectors. When there are multiple detectors, the detectors are endowed with relevant detection attributes according to the actual needs of small celestial bodies surrounding the detectors for optical cooperative orbit determination. The optical measurement of small celestial bodies around the detector optical cooperative orbit determination.

Description

technical field [0001] The invention relates to an optical cooperative orbit determination method for a small celestial body surrounding a detector, and belongs to the technical field of deep space detection. Background technique [0002] The orbit determination of small celestial bodies around the detector is of great significance for the design of motion orbits near small celestial bodies, scientific observation of small celestial bodies, and safe landing sampling of small celestial bodies. It is one of the key technologies in small celestial body detection missions. Optical observation is a commonly used orbit determination technology for small celestial bodies orbiting detectors. In previous missions, the orbiting detectors optically imaged the surface of small celestial bodies to obtain surface topographic feature points, and then matched the feature points with the prior terrain database to achieve optical orbit determination. However, this method requires the terrain...

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Problems solved by technology

However, this method requires obtaining the terrain database of small celestial bodies in advance, which greatly increases the technical difficulty of the task, and the terrain database itself has errors, which limits the accuracy of optical orbit determination.

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