A Lunar Satellite Orbit Determination Method Based on Information Fusion

Abstract

The invention relates to the technical field of information acquisition and processing, and relates to a method for determining the orbit of a lunar satellite. The method is to fuse the motion information of the lunar satellite obtained by the earth survey station through radio measurement methods with the satellite position information obtained by precise image matching during the lunar satellite orbiting the moon, and calculate the lunar satellite based on the optimized fusion information. precise track. The specific steps are as follows: 1) Firstly, based on the matching results of the spaceborne high-resolution camera image and the high-precision lunar surface map, the precise position of the satellite in the lunar fixed coordinate system is solved; 3) Construct a joint filter to realize the fusion of satellite matching position and ground radio measurement information; 4) Based on the information fusion results, the precise orbit of the lunar satellite is calculated through the orbit dynamics model.

Description

technical field [0001] The invention relates to the technical field of information acquisition and processing, in particular to a method for satellite orbit determination based on fusion of lunar surface visual image information and ground radio measurement information. Background technique [0002] At present, the orbit measurement parameters of my country's lunar exploration satellites are all obtained by radio measurement methods from stations on the earth. The methods include unified S-band carrier measurement and very long baseline interferometry. Although this method can meet the current mission requirements, there are potential problems as follows: (1) All measurement information comes from earth stations, and the accuracy of orbit determination will be affected by the long distance between the earth and the moon; (2) The measurement time is strictly limited by the ground Due to the constraints of the station measurement and control arc (that is, the continuous observ...

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Problems solved by technology

Although this method can meet the current mission requirements, there are potential problems as follows: (1) All measurement information comes from earth stations, and the accuracy of orbit determination will be affected by the long distance between the earth and the moon; (2) The measurement time is strictly limited by the ground Constraints on the station measurement and control arc (that is, the continuous observation time period), when the satellite is outside the measurement and control arc or on the back of the moon, no effective information can be obtained

[0003] Due to the rich position information contained in the image, visual image information has been used as an effective positioning reference information in the precise navigation of Earth aircraft such as near-Earth satellites, UAVs and cruise missiles. The basic idea is to rely on observation maps and The matching correspondence of the ground reference map is used to determine the accurate position of the aircraft relative to the ground at the time of imaging, but this method is currently limited to the application of the ground range

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