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Novel method for correcting error of wide-area ionized layer

A technology of ionospheric errors and new methods, applied in the field of satellite navigation systems, can solve problems such as difficulty in establishing grid models

Inactive Publication Date: 2013-02-13
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a new method for wide-area ionospheric error correction, which can solve the problem of accurate correction of the regional ionosphere in my country according to the characteristics of China's terrain distribution that is difficult to establish a grid model

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  • Novel method for correcting error of wide-area ionized layer
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  • Novel method for correcting error of wide-area ionized layer

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[0024] Select 13 reference stations of Changchun, Shanghai, Xi'an, Lhasa, Taxkorgan, Wushi, Delingha, Yanchi, Xining, Jixian, Tai'an, Zhengzhou, Hailaer and other 13 reference stations of the China Earthquake Ionosphere Monitoring Test Network on September 5, 6, 7, The vertical observation data of 6 days on 8, 9, and 11, the data sampling interval is 1h, and a large number of trial calculations were carried out according to the ionospheric correction triangular partition method. The base station and the last 8 stations are regarded as monitoring stations to test the model correction effect.

[0025] According to the existing station distribution, the five reference stations in the mid-latitude region are divided into three triangular sub-regions with Xi'an as the center, as shown in figure 2 shown. Namely 1 Changchun, Xi'an and Shanghai; 2 Changchun, Xi'an and Taxkorgan; 3 Lhasa, Xi'an and Taxkorgan. Trial calculation of ionospheric correction triangular partition method wa...

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Abstract

The invention discloses a novel method for correcting an error of a wide-area ionized layer, wherein one of monitoring stations placed in the middle is taken as a central station according to the distribution of the monitoring stations for the ionized layer, and the central station and two edge stations radiating outwards form a triangle which is taken as a triangle sub-area. The covering area of the monitoring station is divided into areas consisting of a plurality of triangle sub-areas so as to establish a triangle sub-area ionized layer model covering the whole network service area. The vertical ionized layer delay at three vertexes (the monitoring stations) can be obtained through resolving according to the triangle sub-areas in which puncture points of the user ionized layer are located, the data (VTEC) of the ionized layer at the puncture points can be calculated through a distance power exponent weighting method, and then the data can be converted to the content (TEC) of a station-star oblique ionized layer through obliquity factors. The method solves the problem of accurate correction for the ionized layer in regions of China according to the characteristic that a grid model is difficult to establish for the topography distribution in China.

Description

technical field [0001] The invention relates to a satellite navigation system, in particular to a new method for correcting wide-area ionospheric errors. Background technique [0002] The ionospheric delay error is the biggest error source affecting the positioning accuracy of satellite navigation, and it is also one of the important problems that need to be solved urgently to improve the positioning accuracy of my country's Beidou satellite navigation system. Many scholars at home and abroad have done a lot of fruitful work in this area. Dual-frequency receiver users can take advantage of the inverse square relationship between ionospheric delay and signal frequency, and use dual-frequency combination to weaken the effect; for single-frequency receiver users, there are usually two methods for ionospheric delay correction: one is based on navigation messages. The ionospheric delay prediction model, such as the Klobuchar model in the GPS navigation message, can eliminate abo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/07
Inventor 蔡成林席超李思敏韦照川李天松王利杰李志斌
Owner GUILIN UNIV OF ELECTRONIC TECH
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