Method and system for acquiring ionosphere delay error

Abstract

The invention discloses a method for acquiring delay errors of ionosphere and a system. Through the method, error sequences and error limit ranges of ionospheres of all breakthrough points of a reference station can be acquired, and be directly sent to a user; and the user can acquire delay errors of the ionosphere of a breakthrough point of the user according to the breakthrough point of the user and the acquired error sequence and error limit range of the ionosphere of the breakthrough points of the reference station. Meanwhile, the invention also discloses a system for acquiring delay errors of the ionosphere. The method for acquiring the delay errors of the ionosphere can effectively reduce treatment and calculation amount of ionosphere corrected data, improve acquisition precision of the ionosphere delay errors and reliability of a navigation system, and is particularly suitable for the navigation system consisting of a plurality of constellations.

Description

technical field [0001] The invention relates to navigation and positioning technology, in particular to an ionospheric delay error acquisition method and system. Background technique [0002] At present, ionospheric delay has become the largest error source in Global Positioning System (Global Positioning System, hereinafter referred to as GPS) positioning. Since the ionospheric delay changes with time and location, how to provide real-time ionospheric correction data for users in each area is an important way to improve the accuracy of GPS positioning. [0003] The ionospheric grid correction technology in the Wide Area Augmentation System (Wide Area Augmentation System, hereinafter referred to as WAAS) provides a method of providing real-time ionospheric correction for each small area user respectively. The ionospheric grid correction technology is based on the grid of an imaginary sphere, the center of which coincides with the center of the earth, and the radius is the s...

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Problems solved by technology

[0009] In the process of realizing the present invention, the inventor finds that the prior art has at least the following technical defects: the correction data of the ionosphere at the penetration point obtained by the regional reference station are all sent to the wide-area central station, and the wide-area central station calculates all The correction data of the IGP ionosphere is then forwarded to the GPS user, which makes the data processing capacity of the whole system large, and the data needs to be weighted twice, and the number of weighting is large, which increases the accuracy loss in the weighting process and reduces the ionospheric delay. The accuracy of the error; because all the ionospheric correction data need to be sent to the GPS user by the wide-area central station, if the central station fails, the entire system will be paralyzed and cannot be used, and the adaptability and reliability of the system are poor; GPS users can only rely on The four grid points where the GPS user is located carry out the calculation of the ionospheric delay error, which makes the mobility of the GPS user poor

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