Network rtk double-difference ionospheric delay interpolation method and device

Abstract

The invention discloses a network RTK dual-difference ionosphere delay interpolation method and device; the method comprises the following steps: selecting a plurality of CORS stations to form a resolve unit, selecting the CORS station most adjacent to a VRS as the main base station, and other CORS stations as slave base stations; using the shortest path algorithm to obtain shortest communication paths between all slave base stations and the main base station in the resolve unit; obtaining the dual-difference ionosphere delay true value respectively corresponding to each the shortest communication path; stacking all dual-difference ionosphere delay true value scalars so as to obtain the total dual-difference ionosphere delay true value between each slave base station and the main base station; calculating to obtain the dual-difference ionosphere delay fitting value between the VRS and the main base station according to the total dual-difference ionosphere delay true value between each slave base station and the main base station and the relative position relation between the VRS and all base stations. The interpolation method has better modeling precision, so the RTK positioning result can have higher reliability and better positioning effect.

Description

technical field [0001] The invention relates to an inter-station positioning method of a Continuously Operating Reference Station (CORS) system, in particular to an RTK double-difference ionospheric delay interpolation method and device for a Virtual Reference Station (VRS) network. Background technique [0002] With the continuous development of GNSS global satellite navigation and positioning technology, real-time high-precision dynamic differential positioning technology (network RTK technology) represented by virtual reference station (VRS) technology is widely used. VRS technology is based on the observation data of each reference station for baseline calculation, using LIM model and DIM model to construct an accurate spatial correlation error correction model, and then construct a virtual reference station for calculating the RTK user coordinate position. [0003] The VRS virtual observation fitting model is as follows: [0004] [0005] where λ is the carrier phas...

AI Technical Summary

Problems solved by technology

At the same time, the number of baselines modeled by the triangular interpolation model is only two, and the number of samples involved in the modeling is small. There is no redundant observation when the double-difference ionospheric delay is fitted at the interpolation position, and the modeling results cannot be checked.

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