Geosynchronous orbit constellation orbit determination method based on ground station/satellite link/GNSS combined measurement

Abstract

The invention discloses a geosynchronous orbit constellation orbit determination method based on ground station / satellite link / GNSS combined measurement. The method comprises the steps of (1) establishing the state equation of a GSO constellation orbit determination system in a centralized structure, (2) establishing the measurement equation of the GSO constellation orbit determination system in a centralized structure, (3) carrying out combined optimization of a ground station for orbit determination and GNSS measurement combination, (4) determining the filtering method for realizing orbit parameter estimation according to the above established GSO constellation combined orbit determination system model based on ground station / satellite link / GNSS, and (5) carrying out the concrete realization of a GSO constellation orbit determination method based on ground station / satellite link / GNSS in the centralized structure. According to the method, the combined distribution optimization strategy of ground station and GNSS measurement is established based on a precision factor, and the calculation amount is reduced while the orbit determination precision is ensured.

Description

technical field [0001] The invention belongs to the field of orbit determination of satellite constellations in geosynchronous orbits, specifically, it is a satellite-earth, star-star and GNSS that are obtained through effective fusion and utilization of three measurement methods: ground station / inter-satellite link / GNSS, respectively. Measure information to realize the joint orbit determination method of geosynchronous orbit satellite constellation. Background technique [0002] With the rapid development of space science and technology, Geosynchronous Orbit Satellite (GSO) constellations are widely used in the fields of navigation and positioning, timing, communication and reconnaissance. High-precision satellite orbit determination technology is an important prerequisite for the overall function and performance of the constellation. Geostationary Earth Orbits (GEO) satellites and Inclined Geosynchronous Orbit (IGSO) satellites constitute the GSO constellation. The satel...

AI Technical Summary

Problems solved by technology

Compared with other orbit type satellites, there are greater difficulties in precise orbit determination of GSO satellites

[0003] There are certain limitations in the orbit determination of GSO satellites based on ground station measurement technology. (1) The "stationary" characteristics of GEO and the small distribution of IGSO satellite sub-satellite track areas with small inclination angles make it different from that of ground stations. The relative position changes are not obvious, and the observation geometry changes between satellite stations are very small, that is, the dynamic constraint information of the satellite relative to the ground station is weak. At this time, the effect of Doppler tracking is not obvious, and the amount of information brought by increasing the observation time is also limited. (2) When only ground stations within the territory of the country can be selected for satellite measurement and control, due to the relatively small deployment range and the high-orbit characteristics of GSO, the strength of the observation geometric structure formed between satellites and ground stations is quite poor, which will lead to In the process of estimating satellite orbit parameters, the observation equation may be ill-conditioned, affecting the estimation accuracy

(3) In order to keep GEO satellites geosynchronous, it is necessary to implement frequent maneuver control, which also brings great troubles to the determination and prediction of GEO satellites' precise orbits

[0005] At present, there are few domestic researches on high-orbit satellite constellation comprehensive utilization of satellite-earth, satellite-satellite and GNSS measurements to achieve orbit determination

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