Method and system for quickly fixing ambiguity between rtk reference stations in gnss network
A fixed method and technology of reference stations, applied in satellite radio beacon positioning systems, radio wave measurement systems, instruments, etc. Insufficient closure conditions and other problems, to achieve the effect of speeding up the fixing efficiency, reducing the search range, and rigorous theory
Active Publication Date: 2019-12-24
WUHAN UNIV
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[0005] However, the current algorithm for the utilization of ambiguity closure conditions between reference stations is not perfect, and there is a lack of systematic constraint algorithms that transform the ambiguity closure constraints into observation domain or ambiguity search domain constraint equations
In most cases, the ambiguity closure constraint is only used for the reliability test of ambiguity fixation, but there is no improvement in the efficiency of ambiguity fixation between reference stations. Accessibility with ambiguity fixation
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[0047] The present invention makes full use of the ambiguity closing condition between network RTK reference stations, and converts it into a strong constraint equation before ambiguity search, reduces the ambiguity search space, and improves the fixation efficiency of ambiguity search. The present invention can quickly and reliably fix network RTK Double-differenced ambiguities between reference stations.
[0048]The technical solutions of the present invention will be further specifically described below in conjunction with the accompanying drawings.
[0049] See figure 1 , the concrete steps of the inventive method are as follows:
[0050] S1 is based on the original GNSS observation data, and solves the double-difference ambiguity floating-point solution between RTK reference stations in the GNSS network.
[0051] This step can be solved using conventional techniques. For ease of understanding, a specific solution method for floating-point ambiguity between RTK reference...
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The invention discloses a rapid fixing method and system of fuzziness between GNSS network RTK reference stations. The method comprises steps of S1 resolving a double-difference fuzziness floating point solution between the GNSS network RTK reference stations; S2 constructing a virtual indirect adjustment observation model and a constraint according to the double-difference fuzziness floating point solution; S3 using the virtual indirect adjustment observation model and the constraint as an observation equation and a limiting condition in an accompanied limiting condition indirect adjustment model, establishing an indirect adjustment resolving model of an accompanied limiting condition, and resolving an optimal floating point solution of the double-difference fuzziness; and S4 using a least square reduction related adjustment method to carry out searching calculation on the optimal floating point solution of the double-difference fuzziness, and determining the double-difference fuzziness. According to the invention, enclosed constraints of the fuzziness between the reference stations are fully used; the searching range of the fuzziness floating point solution is reduced; and the fuzziness fixing efficiency is improved.
Description
technical field [0001] The invention relates to a method for determining ambiguity, in particular to a method and system for quickly fixing ambiguity between GNSS network RTK reference stations. Background technique [0002] In network RTK technology, whether it is to establish an error model or calculate a high-precision comprehensive error, the correct determination of the double-difference ambiguity between reference stations is the first condition. Due to the long distance between network RTK reference stations, quickly determining the ambiguity between long baseline reference stations is the key to improving the efficiency of network RTK initialization. [0003] In the fixation of ambiguity between network RTK reference stations, due to the long baseline, the delay of double-difference ionosphere and troposphere has a great influence on the fixation of double-difference ambiguity, and the estimation of double-difference ionosphere and troposphere generally takes a perio...
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IPC IPC(8): G01S19/44
Inventor 章红平胡楠楠李团
Owner WUHAN UNIV