A Correction Method for Multipath Errors in GNSS Positioning and Attitude Measurement

A multi-path error and multi-path technology, applied in the field of satellite positioning and navigation, can solve problems such as poor high-frequency multi-path modeling, and achieve the effect of improving modeling capabilities

Active Publication Date: 2022-04-05
EAST CHINA NORMAL UNIV
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Problems solved by technology

Although the calculation efficiency of the MHM method is greatly improved compared with the spherical harmonic function model, it uses the average residual error in the grid as the correction value, ignoring the difference of multipath values ​​in the grid, resulting in poor high-frequency multipath modeling and requiring Fine mesh segmentation can ensure accuracy

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  • A Correction Method for Multipath Errors in GNSS Positioning and Attitude Measurement
  • A Correction Method for Multipath Errors in GNSS Positioning and Attitude Measurement
  • A Correction Method for Multipath Errors in GNSS Positioning and Attitude Measurement

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Embodiment

[0063] The invention is suitable for multi-path error correction of static and dynamic carriers with constant multi-path environment in GNSS positioning and navigation applications. Compared with the existing multipath modeling method based on spatial repeatability, the present invention improves the modeling ability of high-frequency multipath, reduces the requirement on the grid scale and improves the calculation efficiency.

[0064] In order to verify the present invention, a static short baseline multipath correction experiment has been implemented, and the specific implementation steps include:

[0065] Step 1: Short baseline solution and multipath calculation

[0066] (1) Establish a common clock single-difference model

[0067] Based on the common clock multi-antenna receiver to solve the short baseline, the single difference between stations can eliminate the atmospheric delay, satellite clock difference and receiver clock difference, and the common clock single diffe...

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Abstract

The invention discloses a method for correcting multi-path errors in GNSS positioning and attitude measurement. The method comprises: short baseline solution and multi-path calculation; multi-path hemisphere model establishment based on trend surface analysis; and multi-path real-time correction. The trend surface analysis method is used to fit the multipath spatial distribution characteristics in the sky grid, which improves the modeling ability of the multipath modeling method based on spatial repeatability for high-frequency multipath, and improves the accuracy of positioning and attitude measurement; The requirements for the sky grid scale are satisfied, and the calculation efficiency is improved. This method is applicable to both static and dynamic scenarios where the multipath environment remains unchanged.

Description

technical field [0001] The invention relates to the field of satellite positioning and navigation, in particular to a method for correcting multipath errors in GNSS positioning and attitude measurement. Background technique [0002] The modeling method based on multipath spatiotemporal repeatability can realize real-time processing of multipath effects in GNSS positioning. Among them, the multipath modeling method based on spatial repeatability, such as spherical harmonic function model and multipath hemisphere map (MHM) method, is not only suitable for static positioning mode, but also suitable for dynamic carriers such as ships and aircrafts with constant multipath environment Positioning, therefore has a significant advantage. However, these methods have obvious limitations. The accuracy of the spherical harmonic function model depends on the fitting order, and it is difficult to balance the model accuracy and computational efficiency. Although the calculation efficien...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/55
CPCG01S19/55
Inventor 董大南王梽人陈雯余超郑正奇李博刘敏
Owner EAST CHINA NORMAL UNIV
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