Rapid ambiguity determination method among network RTK reference stations of big-dipper three-frequency signal

Abstract

The invention discloses a rapid ambiguity determination method among network RTK reference stations of a big-dipper three-frequency signal. The method is characterized by firstly, rapidly determining a big-dipper super-wide lane ambiguity; then, using two carrier-wave-phase non-ionosphere combination observation values and the super-wide lane ambiguity to determine a wide lane ambiguity; and then, using Kalman filtering to calculate zenith troposphere delay correction between the phase non-ionosphere combination observation values and the reference stations; and finally, fixing an original ambiguity. The method comprises the following steps of (1) fixing the super-wide lane ambiguity and the wide lane ambiguity; (2) according to the Kalman filtering, estimating two-reference-station zenith troposphere delay and ambiguity floating point solutions of two groups of phase non-ionosphere observation values; and (3) according to a non-ionosphere combination ambiguity and the wide lane ambiguity, fixing the original ambiguity. In the invention, an advantage of the big-dipper three-frequency signal is fully used and the Kalman filtering is combined so as to realize rapid and accurate fixation of the ambiguity among big dipper network RTK three-frequency reference stations.

Description

technical field [0001] The invention relates to the technical field of satellite navigation and positioning data processing, in particular to a method for quickly determining the ambiguity between network RTK reference stations of Beidou tri-frequency signals. Background technique [0002] Network RTK is a high-precision real-time dynamic positioning technology established on the basis of differential GPS theory using satellite navigation systems in the 21st century. It is widely used in modern geodesy and high-precision positioning. The network RTK system estimates multiple corrections such as atmospheric delay and orbit error in real time through the observation data of multiple reference stations, and broadcasts them to the rover. The rover calculates the corresponding error corrections based on its approximate coordinates, providing users with real-time centimeter-level dynamic positioning service. At present, the development of GPS-based network RTK technology is very ...

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Problems solved by technology

[0005] According to the above discussion, it can be seen that many scholars have conducted a lot of research on the ambiguity resolution between RTK reference stations of the Beidou network. The ambiguity resolution of the triple-frequency signal can greatly improve the resolution speed, but the accuracy is lower than that of the dual-frequency signal. There is no obvious improvement, and at the same time, in the network RTK solution of medium and long baselines, the tropospheric delay becomes the main factor restricting the success rate of ambiguity solution between reference stations

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