Wide lane ambiguity resolution method through BDS and GPS observation information fusion

Abstract

The invention discloses a wide lane ambiguity resolution method through BDS and GPS observation information fusion. The method comprises the steps of firstly, using the triple-frequency advantage of a BDS and performing preferred and reliable single-epoch fixing of the combination ambiguity of a ultra wide lane and a wide lane of the BDS; and secondly, using short-term stable variation characteristics of ionized layer delay, parameterizing inclining ionized layer delay values of different satellites of the BDS and the GPS, and using the ionized layer frequency relationship for simultaneously solving different combination observation values (including a pseudo-range), wherein, the BDS comprises pseudo-range observation values at three frequency points and ultra wide lane or wide lane observation values with two fixed ambiguities and the GPS comprises pseudo-range observation values at two frequency points and wide lane observation values with the wide lane ambiguity to be evaluated. Common position increment parameters are used for fusion of the above observation information, and a geometric correlation model is made for kalman filtering. The method provided by the invention can be used for significantly increasing the resolution precision and speed of the wide lane ambiguity of a dual-frequency system, especially of a low altitude angle satellite.

Description

Technical field [0001] The invention relates to a global navigation satellite system (GNSS) satellite positioning method, in particular to the fast and accurate solution of ambiguity in a carrier-based multi-frequency multi-system RTK (Real-Time Kinematic). Background technique [0002] Carrier-based RTK (Real-TimeKinematic) technology is currently one of the most widely used GNSS precision positioning technologies. It allows users to obtain centimeter-level positioning results conveniently and in real time. It has been used in precision engineering surveys, land and resources surveys and other fields. Wait until it is widely used. In recent years, with the operation of my country's Beidou System (BDS), the construction of Galileo, IRNSS, etc. and the improvement of GPS and GLONASS, satellite navigation has entered a new era of coexistence of multiple systems. Multi-mode and multi-frequency observation information is the accuracy and reliability of satellite positioning. Such per...

AI Technical Summary

Problems solved by technology

However, for the dual-frequency case, the resolution of the wide-lane ambiguity is still an urgent problem to be solved: Although the MW combination method eliminates the influence of ionospheric and tropospheric delays, it is based on a single satellite pair and does not make full use of each satellite. The redundant information provided by satellite pairs requires a long time to achieve a high success rate, and it is based on a geometrically independent model, which makes it difficult to effectively fuse with the tri-frequency observation information; and the conventional WL method cannot be effective Solve the problem of ionospheric delay, the main factor affecting the fixation of medium and long baseline ambiguity

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