Virtual observation data generation method and device

Abstract

The invention discloses a virtual observation data generation method and device. The method comprises the steps that a base station network element in which a terminal is positioned is determined; a main reference base station, network element global common-view satellites and a reference satellite are determined in the base station network element according to the determined base station network element; double differential atmospheric parameters of a network element baseline in which the main reference base station is positioned are calculated so that the double differential atmospheric parameters of a virtual baseline are obtained through interpolation; and finally the double differential atmospheric parameters are converted into single differential atmospheric parameters through a single differential model, and carrier phase and pseudo-range virtual observation values corresponding to all systems and all frequency points are generated. With application of the method, the problem of redundant matrix transform caused by inconsistence generated by independent selection of all the baseline common-view satellites and the reference satellite in the network element can be solved. Besides, virtual reference base station observation data are constructed by adopting the single differential model equivalent to a double differential model so that result precision is guaranteed and model complexity is reduced.

Description

technical field [0001] The present application relates to the field of communication technology, in particular to a method and device for generating virtual observation data. Background technique [0002] Continuously Operating Reference Station System (English: Continuously Operating Reference Stations, referred to as: CORS) is one of the effective ground enhancement methods for positioning using GNSS, and its application field is gradually expanding. The more popular implementation. [0003] The virtual reference base station technology is that the CORS data processing center determines the network element where it is located by receiving the approximate coordinates sent by the terminal, performs calculations such as baseline calculation, error interpolation, and virtual observation value generation inside the network element, and generates a set of The carrier phase and pseudo-range observation data are broadcast to the outside, and the terminal can obtain its own high-p...

AI Technical Summary

Problems solved by technology

However, the selection results of common-view satellites and reference satellites for each baseline in the network element may be inconsistent, which will lead to repeated selection of common-view satellites, transformation of reference satellites, and correlation matrix operations when generating virtual observations, increasing the amount of calculation; In addition, the commonly used virtual reference station observation data generation model is obtained based on the double-difference observation equation. Practice has proved that the model is feasible and effective, but its mathematical model requires many parameters, and the modeling is more complicated, which is not conducive to programming.

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