A method for fast resolution of ambiguities between Beidou-compatible GPS/Glonass network rtk reference stations
A ambiguity and network technology, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problem of weakening correlation of system errors, increasing residual errors of system errors, and difficulty in accurately solving the ambiguity value of the whole circle, etc. problem, achieve the effect of shortening positioning time, reducing fixed time, improving positioning accuracy and reliability
Active Publication Date: 2017-06-23
SOUTHEAST UNIV
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With the increase of the baseline distance between reference stations, the correlation of systematic errors gradually weakens, and the systematic error residuals in double-difference observations increase rapidly, which makes it difficult to accurately solve the ambiguity value of the entire circle in a short period of time, which affects the network RTK positioning accuracy and timeliness
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[0038] The present invention will be further explained below in conjunction with the accompanying drawings.
[0039] In the multi-system fusion network RTK, according to the network RTK ambiguity resolution model with atmospheric delay prior information constraints, the high-altitude satellite is first fixed, and then the satellite observations with fixed ambiguities are constrained by the atmospheric delay, and Simultaneously solve the corresponding observation equations of low-altitude satellites or newly-rising satellites or satellites that have been lost and recaptured to achieve rapid fixation of the ambiguity of unfixed ambiguity satellites. The general flow chart is as follows figure 1 shown.
[0040] Specifically include the following steps:
[0041] 1), the control center performs the first initialization judgment based on the real-time observation data: when the control center initializes for the first time, the ambiguity of the low-altitude satellite is calculated ...
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The invention discloses a method for quickly calculating the fuzzy degree between RTK reference stations in a Beidou-compatible GPS / GLONASS network. In a network RTK model, the calculation accuracy of the fuzzy degree between RTK reference stations has a direct bearing on the precision of space error modeling of the troposphere, the ionosphere, and the like. In the multi-constellation fusion network RTK, the number of satellites increases significantly, which provides favorable conditions for quickly calculating the fuzzy degree. According to the invention, first, a high-altitude angle satellite is fixed according to a network RTK fuzzy degree calculation model with atmospheric delay priori information, and then, calculation is performed based on the observed value constraint atmospheric delay of a satellite of which the fuzzy degree is fixed and an observation equation corresponding to a low-altitude angle satellite or a newly rising satellite or an unlocked recaptured satellite so as to quickly fix the fuzzy degree of a satellite of which the fuzzy degree is not fixed. By adopting the method, the time for calculating the fuzzy degree between network RTK reference stations is obviously shortened, and the precision and reliability of network RTK positioning are improved.
Description
technical field [0001] The invention belongs to the field of network RTK positioning, and in particular relates to ambiguity resolution between Beidou-compatible GPS / GLONASS multi-system network RTK reference stations. Background technique [0002] With the development of global satellite navigation and positioning systems, compatible positioning based on multi-constellation satellite navigation systems has become a research hotspot in the field of navigation and positioning. The Beidou satellite navigation system is a global satellite positioning and communication system (BDS) developed by my country itself, and it is the third mature satellite navigation system after GPS and GLONASS. Compatible positioning between Beidou and GPS / GLONASS is of great significance. Users can use different constellation system combinations for compatible positioning according to actual needs, so as to avoid the problem of too few satellites and over-reliance on this specific constellation when...
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IPC IPC(8): G01S19/44G01S19/33
Inventor 潘树国王胜利高成发吴波
Owner SOUTHEAST UNIV