A Wide Lane Ambiguity Fixing Method Between Network Reference Stations

Abstract

The invention relates to the field of satellite navigation and provides a method of fixing ambiguity of a wide lane between network reference stations. The method comprises steps: a double-difference wide lane observation value function model is built; a to-be-estimated parameter in the double-difference wide lane observation value function model is set, and a closed loop condition equation is built; according to the double-difference wide lane observation value function model, the to-be-estimated parameter and the closed loop condition equation, a Kalman filtering algorithm is adopted to solve a wide lane ambiguity parameter float solution; an ambiguity search technique is used for acquiring a wide lane ambiguity fixed solution corresponding to the parameter float solution; and the wide lane ambiguity fixed solution is checked. The method of the invention can accurately obtain the wide lane ambiguity fixed solution, defects in the prior art are overcome, and certain popularity is facilitated. In addition, through increasing redundant observation values of the equation, the equation can be converged more quickly, and a stable parameter estimation value is obtained.

Description

technical field [0001] The invention relates to the field of satellite navigation, in particular to a method for fixing wide-lane ambiguities between network reference stations. Background technique [0002] Network RTK (Real Time Kinematic) technology refers to the uniform establishment of multiple (generally three or more) GPS reference stations in a certain area, forming a mesh coverage for the area, and using the Internet as a communication link, and Based on one or more of these reference stations, the correction item information is calculated and sent in real time, and the correction item information is continuously released to the user in real time through the communication link, so that the user end can obtain high-precision real-time positioning accuracy. [0003] At present, the ambiguity resolution of network reference stations is usually divided into three steps: 1. Fix the wide-lane ambiguity; 2. Obtain the floating-point solution of ionospheric The fixed solut...

AI Technical Summary

Problems solved by technology

This method requires smoothing of multiple epochs to obtain a relatively stable floating-point value, and then determines the double-differenced wide-lane ambiguity by rounding or statistical testing methods, and the quality of the original data collected by some receivers is poor, the specific performance is The quality of the pseudo-range is poor, and jitter of more than 30 meters often occurs, resulting in the MW combination value being smoothed through multiple epochs, and a stable floating-point value cannot be obtained, and the double-difference wide-lane ambiguity cannot be accurately determined.

Images