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Ambiguity fixing method

A technology of ambiguity fixation and ambiguity, which is applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve problems such as low success rate of ambiguity fixation and non-universal ambiguity fixation methods, and achieve Improve the success rate of ambiguity fixation, prevent ambiguity from being fixed, and narrow the search range

Active Publication Date: 2017-06-20
SHANGHAI HAIJI INFORMATION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a ambiguity fixing method to solve the problem that the ambiguity fixing method in the prior art is not universal, resulting in a low success rate of ambiguity fixing

Method used

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Embodiment 1

[0041] The specific steps of the ambiguity fixing method described in this embodiment are as follows:

[0042] First, execute step S11 to obtain the floating-point solution of the complete set of ambiguity, count the altitude angles of all satellites and arrange them in ascending order, and sort the complete set of ambiguity according to the result of the ascending order; wherein, the floating-point solution of the complete set of ambiguity is passed through The pseudo-range and carrier double-difference observations are jointly processed and obtained after inter-station and inter-satellite differences.

[0043] Wherein, the double-difference observation value is expressed by the following formula:

[0044]

[0045] In formula (1), l P is the prior residual of the double-differenced pseudorange, l L is the prior residual of the double-difference carrier observation value, Δx is the floating-point solution of the station correction number, ΔN is the floating-point solution o...

Embodiment 2

[0074] Embodiment 2 is a further optimization of the ambiguity fixing method described in Embodiment 1. Since in step S14 in Embodiment 1, if the dimension of the updated ambiguity ensemble is less than the first threshold, the floating point of the ambiguity ensemble is used. The final ambiguity is the floating-point solution of the full set of ambiguities, which is not obtained through searching and fixed. Therefore, its accuracy is low, which is not conducive to subsequent high-precision positioning. In response to this problem, Embodiment 2 proposes a method for fixing the ambiguity to gradually delete satellites to avoid the impact of satellites with relatively unstable tracking loops on the quality of observations, thereby further improving the double-difference ambiguity floating-point solution estimation Accuracy of , obtain reliable ambiguity fixed solution.

[0075] The specific steps of the ambiguity fixing method described in this embodiment are as follows:

[007...

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Abstract

The present invention provides an ambiguity fixing method. According to the ambiguity fixing method of the invention, ambiguity sets are sequenced according to the ascending sorting result of the height angles of all satellites; if the sequenced ambiguity sets fail to pass ratio check, dimension reduction processing is performed on the sequenced ambiguity sets; the updated ambiguity sets which have been subjected to the dimension reduction processing are adopted as the new search targets of the LAMBDA method; and therefore, a search range can be narrowed. Since the dimension reduction processing is based on the height angles of the satellites, and therefore, influence on the quality of observation values caused by the complexity of an observation environment can be decreased, and the success rate of the fixing of ambiguities is improved; if the updated ambiguity sets which have been subjected to the dimension reduction processing are adopted as the new search targets of the LAMBDA method, and the fixed salutations of the ambiguities cannot be obtained still, the observation values of satellites of which the continuous tracking time length is short are eliminated according to the continuous tracking time length of the satellites, and therefore, a phenomenon that the ambiguities cannot be fixed caused by the instability of newly-emerging satellite observation values can be avoided effectively, and the success rate of the fixing of the ambiguities can be further improved.

Description

technical field [0001] The invention relates to the technical field of GNSS real-time differential positioning, in particular to a method for fixing ambiguities. Background technique [0002] Currently, the global satellite navigation and positioning system (GNSS) is composed of GPS in the United States, GLONASS in Russia, BeiDou in China, and Galileo in the European Union. With the development of global satellite positioning technology, the demand for centimeter or even millimeter level positioning accuracy is becoming more and more urgent. GNSS RTK (Real-time kinematic, real-time dynamic difference method) technology is still the most commonly used positioning technology to obtain centimeter or even millimeter level accuracy, and the key point of RTK positioning technology is to fix the ambiguity of the whole circle. [0003] The existing ambiguity fixing method adopts the method of directly fixing the full set of ambiguities. Through the search algorithm of LAMBDA, the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/44
CPCG01S19/44
Inventor 董冰全刘欢赵文峰王璇叶有龙吉青
Owner SHANGHAI HAIJI INFORMATION TECH