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High-precision post-processing positioning method and system for ambiguity domain information integration

A technology of ambiguity domain and information integration, which is applied in satellite radio beacon positioning systems, radio wave measurement systems, instruments, etc., can solve problems such as limiting GNSS applications, improve ambiguity fixation rate and reliability, and improve reliability , Improve the effect of reliability and accuracy

Pending Publication Date: 2019-07-19
WUHAN UNIV
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Problems solved by technology

This greatly limits the application of GNSS in complex urban environments or long-baseline relative positioning scenarios

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  • High-precision post-processing positioning method and system for ambiguity domain information integration
  • High-precision post-processing positioning method and system for ambiguity domain information integration
  • High-precision post-processing positioning method and system for ambiguity domain information integration

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Embodiment Construction

[0030] The technical solutions of the present invention will be described in detail below with reference to the drawings and embodiments.

[0031] The high-precision post-processing positioning method for ambiguity domain information integration proposed in the embodiment of the present invention includes coordinate domain bidirectional Kalman filter solution, ambiguity domain construction, information integration and quality control, and parameter update of integrated ambiguity constraints. See figure 2 The core of the present invention is the integration of information in the ambiguity domain: there may be three situations in which the ambiguity is fixed successfully, failed to be fixed and not fixed in the first filtering result. The present invention aims to use a small part of the fixed correct ambiguity to correct and cover fixed errors. And the unfixed epoch, so as to realize the fixed ambiguity of the whole arc in the ambiguity domain. After the ambiguity information is ...

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Abstract

The invention provides a high-precision post-processing positioning method and system for ambiguity domain information integration. The method comprises steps of constructing multiple ambiguity domains with uniform benchmark and consistent ambiguity numerical characteristic, performing ambiguity information integration analysis on each ambiguity domain by combining forward and backward Kalman filtering solution information of the first time, acquiring correct ambiguity fixed value and then realizing full-time fixing in the ambiguity domain, and finally, updating coordinate parameters, so as torealize high-precision positioning in a post-processing mode. The method can improve ambiguity fixing rate and reliability in GNSS high-precision positioning obviously so as to reach centimeter-levelpositioning precision, thereby having high practical application value in fields like mobile mapping and airborne gravity.

Description

Technical field [0001] The invention belongs to the field of GNSS high-precision positioning, and specifically relates to a high-precision post-processing positioning method and system for ambiguity domain information integration. Background technique [0002] GNSS (Global Navigation Satellite Systems) precision positioning technology refers to the use of global navigation satellite systems, including the Chinese Beidou system, the United States GPS system, the Russian GLONASS system and the EU’s Gailieo system, provided by the International GNSS Service (IGS) The precision products of the company comprehensively consider the accurate correction of various error models, and use the pseudorange and carrier phase observations to achieve single-station precise absolute positioning (PrecisePoint Positioning, PPP) and relative positioning (Post Processing Kinamic, PPK) methods. Accurate fixation of phase ambiguity is the prerequisite and key to high-precision positioning. However, in ...

Claims

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Application Information

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IPC IPC(8): G01S19/44
CPCG01S19/44
Inventor 张小红张钰玺朱锋
Owner WUHAN UNIV
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