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GPS\BDS tight combination precision single-point positioning method based on Helmet posteriori weight determination method

A precise single-point positioning and tight combination technology, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problems of long fixed time, fixed satellite orbit error PPP wide-lane ambiguity, and low fixed reliability.

Pending Publication Date: 2020-01-03
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

The focus is to solve the influence of the large satellite orbit error of the Beidou system on the PPP wide-lane ambiguity fixation
Research the PPP ambiguity fixing method of multi-system tight combination, and the robust and reliable PPP ambiguity fixing inspection method, and strive to overcome the problems of long PPP ambiguity fixing time and low fixing reliability based on the current single GPS system. Provide new ideas for chemical applications

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  • GPS\BDS tight combination precision single-point positioning method based on Helmet posteriori weight determination method
  • GPS\BDS tight combination precision single-point positioning method based on Helmet posteriori weight determination method
  • GPS\BDS tight combination precision single-point positioning method based on Helmet posteriori weight determination method

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Embodiment Construction

[0069] The following describes several preferred embodiments of the present invention with reference to the accompanying drawings, so as to make the technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned herein.

[0070] The purpose of the present invention can be achieved through the following technical solutions:

[0071] The first step: comprehensively analyze the possible deviations and sources of pseudo-range observations and carrier phase observations in positioning, and their impact on the accuracy of positioning results. Single-epoch ambiguity fixation for GPS double-difference observations.

[0072] The second step: according to the different combinations of observation values, establish a PPP data processing model based on GPS single system. Compare the positioning accuracy and reliability of differ...

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Abstract

The invention discloses a GPS\BDS tight combination precision single-point positioning method based on a Helmet posteriori weight determination method. The GPS\BDS tight combination precision single-point positioning method relates to the field of GNSS high-precision real-time precision positioning, and comprises the steps of: step 1, establishing a PPP function model by using a combination of a pseudo-range observed quantity and a carrier phase observed value; step 2, establishing a random model by using the based on Helmet posteriori weight determination method; step 3, unifying space-time references of a dual system; step 4, processing errors; step 5, and carrying out positioning solution by using an iterative least square method. The GPS\BDS tight combination precision single-point positioning method effectively eliminates the problems of large Beidou satellite orbit error and PPP ambiguity fixation caused by frequent orbit maneuver of a GEO satellite, such that the multi-system can realize deep fusion ambiguity fixed solution, the problem of overlarge parameter estimation value variance during multi-system fusion positioning is successfully solved, and the PPP ambiguity fixation rate is improved in a limited manner on the premise of ensuring the fixed correct rate.

Description

technical field [0001] The invention relates to the field of GNSS high-precision real-time precise positioning, in particular to a GPS\BDS dual-system tight combination precision single-point positioning method based on the Helmet posterior weight method. Background technique [0002] With my country's second-generation Beidou navigation system officially providing navigation services around the world, the modernization of the American GPS and Russian GLONASS systems, and the construction of the European Galileo system, the global satellite navigation system has entered the era of multi-GNSS. The multi-system fusion solution can significantly increase the number of available satellites and observation signals, improve the geometric structure of the constellation and reduce the accuracy attenuation factor, provide more redundant information and enhance the reliability of the positioning system, etc. Multi-system data fusion processing is a development trend in the internation...

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Application Information

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IPC IPC(8): G01S19/44
CPCG01S19/44G01S19/425
Inventor 杨乾炜茅旭初吴博钊苏红
Owner SHANGHAI JIAO TONG UNIV
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