Single-difference filtering-based deformation monitoring GNSS (global navigation satellite system) signal multi-path correction method

A deformation monitoring and multi-path technology, which is applied in radio wave measurement systems, measurement devices, satellite radio beacon positioning systems, etc., can solve the problems of multi-path effects, transmission azimuth angles, and inability to accurately evaluate

Active Publication Date: 2017-05-10
SOUTHEAST UNIV
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Problems solved by technology

On the other hand, the GNSS double-difference positioning method (inter-station inter-satellite) needs to select a reference star in each epoch, and transfer the double-difference ambiguity in the Kalman filter. The conversion of double-difference ambiguity ensures the accuracy of transmission and the continuity of filtering. At the same time, its multipath effect is affected by the azimuth and angle of signal transmission of two satellites, so it cannot be accurately evaluated

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  • Single-difference filtering-based deformation monitoring GNSS (global navigation satellite system) signal multi-path correction method
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  • Single-difference filtering-based deformation monitoring GNSS (global navigation satellite system) signal multi-path correction method

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[0065] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention All modifications of the valence form fall within the scope defined by the appended claims of the present application.

[0066] A deformation monitoring GNSS signal multipath correction method based on single-difference filtering, comprising the following steps:

[0067] Step 1. Using the inter-station single-difference non-combined observation model, by adding the initial epoch reference star ambiguity benchmark, estimate the difference value of the single-difference receiver clock between stations in each frequency band of the pseudo-range and the single-difference receiver clock betw...

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Abstract

The invention discloses a single-difference filtering-based deformation monitoring GNSS (global navigation satellite system) signal multi-path correction method. On the basis of the spatial correlation characteristics of inter-receiver single-difference observation residuals, a single-difference filtering method is adopted to fix ambiguity and extract a carrier pseudo-range observation residual; fast Fourier transform analysis and wavelet de-noising are performed on the data residual, so that a discrete multi-path correction map and a reflection multi-path spatial correction map are established; and therefore, influence on GNSS carriers and pseudo-range observation values caused by a multipath effect in a bridge deformation monitoring environment can be decreased. According to the method of the invention, the spatiotemporal repetition characteristics of multiple paths are utilized. With the single-difference filtering-based deformation monitoring GNSS signal multi-path correction method adopted, the reliability and success rate of ambiguity fixation can be effectively improved, and single-epoch calculation accuracy of dynamic monitoring can be improved.

Description

technical field [0001] The present invention relates to the field of positioning and monitoring, in particular to a deformation monitoring GNSS (Global Navigation Satellite System, Global Navigation Satellite System) signal multipath delay correction method based on inter-station single-difference filtering (between-receiver single-difference), which is a GNSS It is an important part of real-time high-precision fast RTK (Real Time Kinematic, real-time dynamic positioning technology) positioning technology research. Background technique [0002] With the improvement and development of satellite positioning system, the accuracy and reliability of GNSS deformation monitoring targets are getting higher and higher. As an extremely effective means of various high-precision measurements, GNSS carrier measurement can output high-frequency, centimeter-level three-dimensional positioning results in real time. When differential positioning is applied, two GNSS receivers implement doub...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/23G01S19/44
CPCG01S19/235G01S19/44
Inventor 潘树国汪登辉高成发尚睿
Owner SOUTHEAST UNIV
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