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Ambiguity fast recovery method used for GNSS positioning and ambiguity fast recovery system thereof

A fast recovery and ambiguity technology, applied in satellite radio beacon positioning systems, radio wave measurement systems, instruments, etc., can solve the problem that the ambiguity cannot be fixed

Inactive Publication Date: 2016-11-09
WUHAN UNIV +1
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Problems solved by technology

[0006] The present invention mainly solves the problem in the prior art that the ambiguity cannot be fixed due to an abnormal event in the satellite when the signal of the observed value is not good; the ambiguity information that has been fixed in the previous epoch before the abnormal event occurs and the ambiguity information in the static situation The obtained precise coordinates of the station provide a technical solution for quickly and reliably reinitializing the ambiguity in satellite positioning

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  • Ambiguity fast recovery method used for GNSS positioning and ambiguity fast recovery system thereof
  • Ambiguity fast recovery method used for GNSS positioning and ambiguity fast recovery system thereof
  • Ambiguity fast recovery method used for GNSS positioning and ambiguity fast recovery system thereof

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Embodiment Construction

[0066] Considering the current research on the method of determining the ambiguity after an abnormal event in a satellite, the main method is to treat the satellite observation value as the cycle slip problem, and re-initialize the ambiguity through the cycle slip detection and repair technology. However, this method relies on the reliability of cycle slip repair, especially for small cycle slips, it is difficult to repair reliably with the existing technology. Once the cycle slip is repaired incorrectly, it will lead to centimeter to decimeter-level positioning errors. The present invention makes full use of the ambiguity obtained in the early stage of solving and the coordinate information of the measuring station, and proposes a new fast re-restoration method of the ambiguity, that is, a fast re-initialization method of the ambiguity based on the previous solution information. This method fixes ambiguity quickly and reliably.

[0067] The technical solution of the present ...

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Abstract

The invention provides an ambiguity fast recovery method used for GNSS positioning and an ambiguity fast recovery system thereof. The ambiguity fast recovery method used for GNSS positioning comprises the phase of acquiring the fixed solution of an epoch before occurrence of an abnormal event and the phase of reinitialization of ambiguity of the moment of the abnormal event. The reinitialization of the ambiguity of the moment of the abnormal event comprises the steps that a virtual observation equation of correct fixed ambiguity and observation station coordinates and a weight matrix thereof are generated, and the ambiguity is determined again through combination of an original observation equation. According to the technical scheme, the ambiguity can be fast and reliably fixed again when the abnormal event occurs in the satellite so that the reliability of determination of the ambiguity can be increased, implementation is easy and convenient, system resources can be saved and the actual application effect is great.

Description

technical field [0001] The invention relates to the technical field of GNSS high-precision relative positioning, in particular to a recovery technical solution after ambiguity is lost or a cycle slip occurs during the GNSS positioning process. Background technique [0002] The full name of GNSS is Global Navigation Satellite System (Global Navigation Satellite System). At present, GNSS high-precision relative positioning is widely used, and fast ambiguity resolution is the key to high-precision positioning. If the ambiguity can be fixed correctly, centimeter-level positioning accuracy can be achieved for dynamic observations, and millimeter-level accuracy can be achieved for static observations for a certain period of time. Scholars at home and abroad have carried out related research on improving the success rate of ambiguity fixation very early, and proposed many effective algorithms. In terms of ambiguity search, it mainly includes the M-W method based on the observation...

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Application Information

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IPC IPC(8): G01S19/44G01S19/51
CPCG01S19/44G01S19/51
Inventor 唐卫明章红平邓辰龙李东俊张爽娜
Owner WUHAN UNIV
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