CORS region ionosphere modeling method

Abstract

The invention provides a CORS (Continuously Operating Reference Station) region ionosphere modeling method comprising the following steps: building a network baseline according to a network baseline length threshold and the known coordinates of a CORS reference station; constituting a calculation unit with a main reference station and baselines connected therewith as elements according to the relationship between the network baseline and the reference station; choosing a reference satellite; building a network baseline double-difference observation equation; performing ionosphere modeling according to the position of the ionosphere puncture point of each reference station; building a Kalman filter to solve parameters to be estimated; fixing the ambiguity according to the result of Kalman filtering; and working out the fixed solutions of ionosphere model parameters according to the fixed ambiguity. According to the invention, ionosphere modeling is performed with a reference station as a calculation unit, the number of calculation units is reduced, the number of available baselines of each calculation unit is increased obviously, and the estimated ionosphere model is of higher accuracy. The method is applicable to ionosphere interpolation under the condition that the user is outside a reference station network.

Description

technical field [0001] The invention relates to the field of RTK measurement, in particular to a CORS regional ionosphere modeling method. Background technique [0002] The Continuously Operating Reference Station System (CORS) is a new technology emerging in this century. It relies on the real-time data flow of the continuously operating reference stations permanently built in the region to build a triangulation network for regional atmospheric error estimation and build an atmospheric error model. Provide real-time dynamic positioning services. Because the network RTK technology has the advantages of uniform accuracy and no need to set up base stations, it has gradually replaced the traditional 1+1 RTK technology in recent years and has become the most mainstream RTK measurement mode. [0003] Network RTK technology, its core technology is to build a regional ionospheric model. The traditional solution method is to independently calculate each triangular network construct...

AI Technical Summary

Problems solved by technology

[0004] 1. The ionosphere is not linearly distributed in the triangulation network, especially when the ionosphere intensity is high, there will be serious systematic errors in modeling by linear methods, which will affect the user's fixed effect

[0005] 2. When the user is not in any t...

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