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Ionospheric error correction method

A technology of ionospheric error and electron concentration, applied in radio wave measurement systems, satellite radio beacon positioning systems, measurement devices, etc. effect of error

Active Publication Date: 2014-08-06
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

The above-mentioned thin-layer model inevitably introduces systematic errors in the conversion of ionospheric time delay from vertical to oblique, which has become one of the main factors limiting the accuracy of ionospheric models
[0008] At present, a method for correcting ionospheric errors that can avoid systematic errors and have high accuracy has not been proposed

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[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] The International Reference Ionosphere (IRI) is a project jointly supported by the International Committee for Space Research (COSPAR) and the International Union of Radio Science Societies. The results of this project—several versions of the IRI model and all available data sources of the model have been public. The IRI model is an empirical model fitted based on a large number of ground and satellite observations of ionospheric parameters accumulated over a long period of time by the global altimeter network and radar observations. For a given location and time, the IRI model can provide monthly average electron density, electron temperature, ion temperature, etc. within the altitude range from 50 km to 2000 km.

[0020] The IRI...

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Abstract

The invention discloses an ionospheric error correction method. On the basis of an international reference ionospheric model, a correction scale model of a theoretical value of an IRI model of the total electron content at any longitude and latitude in each time period relative to a measured value is established and used for determining an estimated value of the total electron content from a preset datum point in a service region to a navigational satellite path, and a user can obtain a corresponding ionospheric error correction value according to the estimated value. By means of the ionospheric error correction method for direct correction of ionospheric errors on a slanted path between the user and a navigational satellite, system errors caused in the conversion process from a vertical TEC to a slanted TEC can be avoided, and the accuracy of correction of ionospheric delay of satellite navigation signals is effectively improved.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to an ionospheric error correction method. Background technique [0002] At present, most global satellite navigation and positioning systems (GNSS) will predict the ionospheric model parameters in the broadcast ephemeris for each single-frequency user to carry out ionospheric error correction in real time. For example, the Klobuchar model used by the GPS system, the NeQuick model used by the Galileo system, and the Klobuchar-like model used by the Beidou system. [0003] The Klobuchar model was proposed by the American scientist J.A.Klobuchar in 1987. The GPS satellite navigation message broadcasts its model parameters for users to use. This model has a close relationship between the time-space changes of the ionosphere and the direct relative movement of the earth and the sun. The simplest and most direct description. It is a more practical and effective method to ensure the re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/07
CPCG01S19/07
Inventor 袁洪张晓坤欧阳光洲曲江华李子申
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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