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An Optimal Algorithm for Navigation Satellite Orbit Determination and Tracking Stations

A technology of navigation satellites and tracking stations, which is applied in the field of satellite orbit calculation, can solve problems such as inapplicability, and achieve the effect of improving calculation efficiency

Active Publication Date: 2022-06-07
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional method of selecting orbit determination tracking stations is to select a certain number of evenly distributed tracking stations around the world based on experience, but there are few related methods to describe the distribution of a certain tracking station through quantitative methods, especially for the current Beidou satellites. Navigation system (BDS), its satellite constellation contains three types of satellites, and the satellite constellation is not evenly distributed globally, which leads to the traditional method of selecting orbit determination tracking stations evenly around the world based on experience, which is not applicable to BDS system satellite orbit determination

Method used

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  • An Optimal Algorithm for Navigation Satellite Orbit Determination and Tracking Stations

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Embodiment 1

[0064] The main content of the first embodiment is how to determine the DOP value of the kinetic parameter, and the specific method is as follows:

[0065] In the process of parameter estimation, the DOP value of the parameter is often used to evaluate the accuracy of the parameter solution. In the calculation of the orbit determination of the navigation satellite based on the observation data of the ground tracking station, the DOP value of the dynamic parameter can be obtained by the following method.

[0066] For the GNSS observation of ground tracking stations, in the case of ignoring various errors and only studying the station distribution structure, the observation model can be simply expressed as:

[0067]

[0068] In the formula: ρ represents the geometric distance between the satellite and the station, i represents the satellite number; (X i , Y i ,Z i ) represents the three-dimensional coordinates of the satellite, (x, y, z) represents the three-dimensional co...

Embodiment 2

[0096] The second embodiment is based on the DOP value of the dynamic parameters determined in the first embodiment to design the navigation satellite orbit determination and tracking station optimization algorithm, and the specific content is as follows:

[0097] 1. Determination of the distribution location of the tracking station

[0098] 11. Select several basic tracking sites.

[0099] 12. Verify that each satellite and each station in the basic tracking station network meet the observation requirements (for example, the observation altitude angle is greater than 5°) epoch by epoch. Based on equation (4), establish an observation equation for the observations that meet the requirements.

[0100] 13. When analyzing the optimal distribution of the ground tracking stations in the state of the inter-satellite link, according to the inter-satellite link routing algorithm (this algorithm has been applied in the project and will not be discussed in depth in this patent), based o...

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Abstract

The invention relates to the technical field of satellite orbit calculation, in particular to an optimization algorithm for navigation satellite orbit determination and tracking stations, which uses indicators to quantitatively analyze the distribution of different tracking stations and the saturation of the number of orbit determination and tracking stations, and provides satellite positioning for each navigation system. Orbit tracking station selection and core reference station site selection provide technical support; the present invention can optimize the position and quantity of navigation satellite orbit determination ground tracking stations without ground tracking station observation data, compared with existing tracking stations The distribution optimization algorithm improves the calculation efficiency, adds the optimization algorithm of the number of tracking stations, and can be compatible with the fusion analysis of multi-type observation values; moreover, the optimization algorithm designed by the present invention is generally applicable to different navigation systems, and is applicable to multiple types of navigation systems at the same time Orbit determination and tracking station optimization in fusion processing of observations.

Description

technical field [0001] The invention relates to the technical field of satellite orbit calculation, in particular to a navigation satellite orbit determination and tracking station optimization algorithm. Background technique [0002] For any spacecraft, precise orbit determination is one of the primary tasks for the stable operation of the spacecraft. For the Global Navigation Satellite System (GNSS), the satellite orbit error is one of the main error sources of observation, and the orbit accuracy directly affects the user's navigation and positioning accuracy. The hot issues that the majority of users are concerned about. Due to the high-precision orbit determination requirements of GNSS navigation satellites, in practical applications, the observation equations are mainly established by using the GNSS measurement data collected by the ground tracking station, and the satellite dynamics parameters are solved by the parameter estimation method. During the solution process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/01G06F30/20G06F111/10
CPCG01S19/01G06F30/20G06F2111/10Y02D30/70
Inventor 张睿涂锐卢晓春韩军强范丽红张鹏飞洪菊刘金海王星星
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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