Smart phone ionized layer error correction method and device based on regional CORS

Abstract

The invention relates to a smart phone ionized layer error correction method and device based on regional CORS. The method comprises the steps of obtaining a double-frequency pseudo-range observation value, a double-frequency carrier phase observation value and a first navigation message in a regional CORS station data stream through a server, obtaining an ionized layer smooth observation value and a first puncture point geocentric longitude and latitude, fitting a regional VTEC formula by combining a low-order spherical harmonic function model, and obtaining an observation equation; resolving the observation equation by using a Kalman filter to obtain regional ionospheric model parameters; enabling a smart phone terminal to obtain regional ionospheric model parameters from the server, analyze an observed value to be corrected according to the obtained GNSS original observed value, analyze geocentric longitude and latitude of a second puncture point according to the obtained second navigation message, determine ionospheric delay correction number according to the geocentric longitude and latitude of the second puncture point and the regional ionospheric model parameters, and correct the observed value to be corrected; and performing positioning analysis by adopting a Kalman filtering method based on the modified observation value, and obtaining a positioning result, so that the real-time positioning precision is improved.

Description

technical field [0001] The present application relates to the technical field of satellite navigation, in particular to a method and device for correcting ionospheric errors of smartphones based on regional CORS. Background technique [0002] The rapid development of smart phones and low-cost chipsets has greatly improved people's quality of life. Google announced at the developer conference in May 2016 that it will provide an interface for the Android Nought operating system to obtain the original GNSS (Global Navigation Satellite System) observation data, which is of epoch-making significance for smartphone positioning. With the opening of the GNSS observation data interface of mobile phones and the improvement of mobile phone performance, the quality of raw GNSS data of smartphones is also constantly improving. However, the ionospheric delay error still affects the positioning effect. How to correct the ionospheric delay more accurately is the key to improving the real-t...

AI Technical Summary

Problems solved by technology

However, the ionospheric delay error still affects the positioning effect. How to correct the ionospheric delay more accurately is the key to improving the real-time positioning accuracy of smartphones.

[0003] At present, the ionospheric correction model is corrected by using broadcast ephemeris or grid files provided by IGS, which cannot accurately reflect changes in the ionosphere

Since 1998, the International GNSS Service (Internal GNSS Service, IGS) has released the global ionospheric TEC (ionospheric total electron concentration) grid product, which provides a large number of data resources for global ionospheric research and application, especially IGS can provide The predicted ionospheric grid product can be used for real-time positioning of smartphones, but when this product is applied to a small area, the real-time positioning accuracy is low

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