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Weight selection fitting method for precise orbit determination of geostationary satellite

A technology for geostationary satellites and precise orbit determination, which is applied in the field of satellite precise orbit determination, can solve the problems of difficult solution and separation of system errors, limited amount of information, poor observation geometry of geosynchronous satellites, etc., to achieve strong stability, Improved ill-conditioned, high-precision effects

Active Publication Date: 2013-05-22
INST OF GEODESY & GEOPHYSICS CHINESE ACADEMY OF SCI
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with other orbit types of satellites, there are greater difficulties in determining the precise orbit of geostationary satellites, which are mainly manifested in: 1) Since the orbit of geostationary satellites is 36,000 kilometers from the ground, the deployment range of tracking stations is relatively small, making the geosynchronous The observation geometric structure of the satellite is weak; 2) The position of the geostationary satellite and the ground tracking station is relatively static, and the geometric change of the station star is very small. bias, etc.) are difficult to resolve and separate
3) In order to keep the position relative to the geostationary, the geostationary satellite needs to implement frequent maneuver control, which brings great trouble to the determination and forecast of the geostationary satellite's precise orbit. If it is not handled properly, it will seriously affect the performance of the new generation of satellite navigation system and system availability
However, this method constrains all parameters, which is equivalent to processing the prior information of all parameters. In fact, the prior information of some parameters to be estimated may be inaccurate, which will cause the parameter estimation to deviate from the true value.
Therefore, the Tychonoff regularization method that constrains all parameters is insufficient in practical applications

Method used

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  • Weight selection fitting method for precise orbit determination of geostationary satellite
  • Weight selection fitting method for precise orbit determination of geostationary satellite
  • Weight selection fitting method for precise orbit determination of geostationary satellite

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Embodiment 1

[0042] The weight selection and fitting method for precise orbit determination of geostationary satellites includes the following steps:

[0043] a. According to the observation data of the geostationary satellite, the dynamic method or the simplified dynamic method is used to obtain the prior value X of the non-singularity orbit parameter, clock error and dynamic parameter of the geostationary satellite, and at the same time obtain the corresponding variance-covariance matrix Σ X , the prior weight matrix with no singular orbital parameters

[0044] P X = Σ X - 1

[0045] Among them, P X is the parameter prior weight matrix of the nth-order square matrix, n is the number of parameters to be estimated, including the number of orbital parameters, clock difference and the number of dynamical parameters;

[0046] b. The linearized observation equat...

Embodiment 2

[0057] Application of Weight Selection Fitting Method in Precise Orbit Determination of Geostationary Satellites

[0058] Simulate two geostationary satellites and one inclined orbit geosynchronous (IGSO) satellite distributed over the equator from 50 degrees to 160 degrees east longitude respectively, marked as GEO1, GEO6 and IGSO; simulate five ground monitoring stations in China and the Antarctic station. The IGSO satellite orbit parameters calculated by the single-difference method of the GEO1 and IGSO satellite dynamic method are used as the prior information of the single-difference orbit determination of the GEO6 and IGSO satellite dynamic method, and the first embodiment is adopted in the single-difference orbit determination of the GEO6 and IGSO satellite. The steps to obtain the parameter estimation of the GEO6 geostationary satellite precise orbit determination, the orbit integration of the parameter estimation, and the geostationary satellite orbit are obtained, th...

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Abstract

The invention discloses a weight selection fitting method for precise orbit determination of a geostationary satellite, which relates to a solution for ill-posed problems in the precise orbit determination of the geostationary satellite. The method comprises the following steps of: calculating a corresponding prior weight matrix by using prior information, obtaining a linear observation equation according to an observation data and a parameter approximate value of the geostationary satellite, applying restraint to 3 to 5 orbit parameters in 6 orbit parameters, and calculating the orbit parameters by a weight selection fitting formula to obtain a parameter assessment value of the precise orbit determination of the geostationary satellite. The method has the advantages that: the ill-posed property of the precise orbit determination equation of the geostationary satellite is improved by reasonably using the prior information of parameters, discriminating the parameters with different prior information and selecting the number of a part of orbits with small variation range to apply the restraint; and shown by graphs, the orbit parameter, the clock correction and the orbit kinetic parameter assessment value calculated by using the weight selection fitting formula have higher stability and higher precision compared with the results obtained by the prior art.

Description

technical field [0001] The invention relates to precise orbit determination of satellites, in particular to a solution to ill-conditioned problems in the precise orbit determination of geostationary satellites. Background technique [0002] Geostationary satellites have a unique orbital feature of relative geostationary, which makes geostationary satellites widely used in communication, meteorology, reconnaissance, navigation and positioning, timing, tracking and data relay, and scientific research. The precise orbit of geostationary satellites must meet the strict requirements of various satellite services on the availability, continuity and consistency of "spatial reference", which also determines the development and expansion of the potential application market of geostationary satellites. Therefore, the research on precise orbit determination methods and technologies has always been one of the hot spots in the development and utilization of geostationary satellites. Geo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/16
Inventor 欧吉坤刘吉华王海涛钟世明
Owner INST OF GEODESY & GEOPHYSICS CHINESE ACADEMY OF SCI