High-frequency clock error estimation method of satellite navigation system

A technology for satellite navigation system and clock error estimation, which is applied in the field of satellite navigation and positioning, and can solve problems such as difficulty in obtaining satellite clock error

Active Publication Date: 2013-03-27
CHINA AEROSPACE KEGONG INFORMATION TECH RES INST
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is a method for estimating the high-frequency clock difference of a satellite nav

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  • High-frequency clock error estimation method of satellite navigation system
  • High-frequency clock error estimation method of satellite navigation system
  • High-frequency clock error estimation method of satellite navigation system

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Embodiment Construction

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0029] There are two ways of estimating the satellite clock error according to the different parameter processing methods: one is to put the clock parameters and other parameters, such as satellite orbit parameters, station coordinates, troposphere parameters, etc. together, and estimate them at the same time; It is to first solve the non-epoch parameters such as satellite orbit parameters and station coordinate parameters, solve them and fix them, then solve the epoch parameters, reduce the number of parameters by epoch, and finally solve the clock difference parameters. For these two methods, if there are few epoch parameters, the first parameter can be used. The second method calculates the...

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Abstract

The invention discloses a high-frequency clock error estimation method of a satellite navigation system. The method includes acquiring observed data of a tracking station; testing the reliability of the observed data; rejecting outliers from the observed data after reliability test by using linear combination of the observation quantity, determining an initial ambiguity, detecting and repairing the cycle slip, and obtaining codes and phase observed values; acquiring a satellite obit parameter, an earth polar motion parameter, a troposphere parameter and a station coordinate parameter; obtaining clock error estimated values of a satellite and a receiver according to original observed data, the satellite obit parameter, the earth polar motion parameter, the troposphere parameter and the station coordinate parameter; and interpolating the obtained clock error estimation by using the code and the phase observed value to obtain the high-frequency clock error estimation of the satellite navigation system. The method has the advantages of high reliability and accuracy and capability of improving the high-frequency clock error estimation accuracy of the satellite navigation system.

Description

technical field [0001] The invention relates to the technical field of satellite navigation and positioning, in particular to a high-frequency clock error estimation method of a satellite navigation system. Background technique [0002] The satellite clock error refers to the difference between the satellite clock time and the navigation system standard time caused by the frequency drift of the satellite clock. The observations of the navigation system are obtained based on the clock frequency signals of satellites and receivers. The user's positioning accuracy is closely related to the accuracy of the satellite clock error and orbit that can be obtained, and the estimation accuracy of the clock error is related to the accuracy of orbit estimation. closely related (also called a coupling relationship). [0003] Taking the GPS (Global Positioning System, Global Positioning System) navigation satellite as an example, the GPS satellite clock error accuracy of the broadcast eph...

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Application Information

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IPC IPC(8): G01S19/23
Inventor 陈智张小强张雪辉宋杨
Owner CHINA AEROSPACE KEGONG INFORMATION TECH RES INST
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