A method to improve the data quality of gnss reference station

Abstract

The invention relates to a method for improving GNSS datum station data quality. The method includes the following steps: datum station observation data quality analysis, data quality analysis result graphical demonstration, signal filtering region division based on a graphical data analysis result, delimiting of an effective spatial range of satellite data receiving, and output of expected observation data. The azimuth angle and altitude angle of a data interference source are accurately positioned, while interference signals are shielded, more satellite observation information is kept, an effective area of data receiving is divided, and environment intervention guidance is accurately provided for field maintenance personnel.

Description

Technical field [0001] The invention relates to a method for improving data quality, in particular to a method for improving data quality of a GNSS reference station. Background technique [0002] The Global Navigation Satellite System (GNSS) is a space satellite radio ranging and positioning system. Satellites evenly distributed on different orbital planes transmit modulated wave signals to users’ receivers through the atmosphere. Demodulate navigation and positioning signals to achieve positioning functions. The receivers used in wide-area differential GNSS and regional GNSS ground-based augmentation systems are collectively referred to as reference station receivers. The base station receiver is set up in the field for a long time according to the user's design, and the satellite data is collected for a long time according to the cut-off angle, sampling frequency and all-weather set by the user, and then transmitted back to the control center in real time. [0003] Since the s...

AI Technical Summary

Problems solved by technology

But in fact, the greater the propagation delay of the low-altitude satellite to the process, the stronger the multipath effect, and the introduction of too many noise signals is not conducive to the improvement of measurement accuracy

The occlusion of the receiver of the base station generally comes from different azimuths (depending on the site environment). The method of all-round and overall improvement of the cut-off elevation angle can effectively filter the noise signal caused by the environment, but at the same time, it also shields the signal of the unoccluded azimuth angle. , the "high-quality" signal in this direction is "wrongly" eliminated, reducing the number of satellites, reducing the geometric precision factor of satellites, reducing redundant observations, and reducing measurement accuracy (the elevation RMS value has a significant impact)

At the same time, good satellite signals in other directions are also filtered out, the number of satellite tracking is not at the maximum, the satellite geometric precision factor is not at the strongest, the redundant observations are not at the maximum, and the measurement accuracy is not at the theoretical best

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