Method for correcting positioning errors by means of wide area weighting of pseudorange differentials

A pseudo-range error and positioning error technology, which is applied in the field of correction of positioning error of wide-area weighted pseudo-range differential pair, can solve problems such as large positioning error and inaccurate positioning, and achieve the effect of improving the scope of application, accurate positioning and high positioning.

Inactive Publication Date: 2012-11-21
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the pseudo-range difference also has its own limitations. Its range of action can only be within about 40km. If it exceeds the area of ​​40km, there will be problems of large positioning errors and inaccurate positioning.

Method used

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  • Method for correcting positioning errors by means of wide area weighting of pseudorange differentials
  • Method for correcting positioning errors by means of wide area weighting of pseudorange differentials
  • Method for correcting positioning errors by means of wide area weighting of pseudorange differentials

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Embodiment 1

[0017] The implementation of the wide-area weighted pseudorange differential method in this embodiment involves three parts: six differential reference stations in China, one user, and pseudorange differential accuracy simulation.

[0018] The pseudo-range differential accuracy simulation is mainly to compare the pseudo-range error caused by the simulated ephemeris error and ionospheric error at the user's location with the wide-area weighted pseudo-range correction of the virtual reference station at the user's location to obtain the pseudo-range differential positioning accuracy.

[0019] Set up 6 pseudo-range differential reference stations in China, that is, N is 6, located in Xi'an, Changchun, Kashi, Sanya, Shanghai, and Lhasa. The time of each station is synchronized with the coordinated universal time of the National Time Service Center, and a common-view receiver is placed in each station. Chengdu users are selected for simulation. The satellite is selected as the Asi...

Embodiment 2

[0031] In the above-mentioned embodiment 1, 9 pseudo-range differential reference stations are set up in China, that is, N is 9, which are respectively located in Xi'an, Changchun, Kashi, Sanya, Shanghai, Lhasa, Hohhot, Beijing, and Xiamen, and Chengdu users are selected for simulation. The satellite is selected as the Asia-Pacific 1A satellite, and the position of the satellite within one day on August 2, 2009 is used as the actual position of the satellite, and the actual position plus a certain error is used as the broadcast ephemeris. In one day, the ephemeris x-direction error is set to: The ephemeris y-direction error is set to The ephemeris z-direction error is set to When t is a place, taking the ephemeris error A=10 meters as an example, the correction method of the wide-area weighted pseudorange difference to the positioning error comprises the following steps:

[0032] (1) Nine pseudorange differential reference stations, namely Xi'an, Changchun, Kashi, Sanya, ...

Embodiment 3

[0042] In the above-mentioned embodiment 1, 8 pseudo-range differential reference stations are set up in China, that is, N is 8, respectively located in Changchun, Kashi, Sanya, Shanghai, Lhasa, Hohhot, Beijing, and Xiamen, and Chengdu users are selected for simulation. The satellite is selected as the Asia-Pacific 1A satellite, and the position of the satellite within one day on August 2, 2009 is used as the actual position of the satellite, and the actual position plus a certain error is used as the broadcast ephemeris. In one day, the ephemeris x-direction error is set to: The ephemeris y-direction error is set to The ephemeris z-direction error is set to When t is a place, taking the ephemeris error A=10 meters as an example, the correction method of the wide-area weighted pseudorange difference to the positioning error comprises the following steps:

[0043] (1) Eight pseudo-range differential reference stations, namely Changchun, Kashgar, Sanya, Shanghai, Lhasa, Hoh...

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Abstract

The invention relates to a method for correcting positioning errors by means of wide area weighting of pseudorange differentials. Pseudorange correction is subjected to simulation verification by means of weighted average of pseudorange differentials of M reference stations closest to users by the users, the pseudorange differentials and the virtual reference station technique are combined to control influences of ephemeris errors and ionized layer errors on positioning within a certain range by means of the technique of wide area weighting of the pseudorange differentials at the virtual reference stations, and pseudorange differentials with precision superior to 0.5m can be finally realized. Further, high-precision positioning can be realized, accuracy in positioning is guaranteed, and the application range of conventional pseudorange differentials is widened.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation difference, in particular to a method for improving the scope of application of pseudo-range difference and improving the positioning accuracy of pseudo-range difference, in particular to a method for correcting positioning errors by wide-area weighted pseudo-range difference. Background technique [0002] Differential technology is an important technology to improve the positioning accuracy of satellite navigation and positioning system. In the process of satellite navigation and positioning, the errors affected by observations, such as satellite ephemeris, ionosphere and troposphere, etc. are spatially correlated, and satellite clock errors are strongly spatially correlated. Therefore, two stations separated by a certain distance, If the same satellite is observed synchronously, the observations at the two stations can be considered to contain the same error. If a station is set as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/41
Inventor 薛艳荣李孝辉许龙霞任烨
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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