An Incremental Ionospheric Refraction Error Correction Method

Abstract

The invention discloses an increment ionosphere refraction error correction method which is applied to a GNSS single-frequency user. The method comprises a monitoring station utilizes ionosphere model parameters broadcasted by a GNSS system itself to calculate ionosphere vertical TEC1, and meanwhile, utilizes double-frequency observation data to calculate ionosphere vertical TEC2, and difference value [delta] TEC between the TEC1 and the TEC2 is obtained; a plurality of monitoring stations transmit the [delta] TECs of themselves to a master control station through a communication link; the master control station receives each [delta] TEC, establishes an ionosphere increment variation model, obtains ionosphere increment variation model broadcast parameters a, b and c in a region, and transmits and broadcasts the a, b and c to the user through a broadcast link; a user receiver receives a navigation signal and the a, b and c, utilizes the ionosphere model parameters broadcasted by the GNSS system itself to calculate TEC <GNSS>, utilizes the a, b and c to estimate optimum estimation value (shown in the specification ) of the ionosphere increment through a common Kriging algorithm, and adds the TEC <GNSS> with the optimum estimation value (shown in the specification ) to obtain TEC ; and the TEC is utilized to calculate ionosphere addition time delay, so that high-precision ionosphere refraction error correction for the GNSS single-frequency user is realized.

Description

technical field [0001] The invention relates to the field of ionospheric refraction error correction of satellite navigation systems, in particular to an incremental ionospheric refraction error correction method applied to GNSS single-frequency users. Background technique [0002] As early as the mid-1990s, in order to break the monopoly position of the United States in the satellite positioning, navigation, and timing markets, the European Union has been committed to an ambitious civilian GNSS program, called the Global Navigation Satellite System (Global Navigation Satellite System, GNSS). The plan is implemented in two steps: the first step is to establish a first-generation global navigation satellite system (called GNSS-1 at the time, which was later built as EGNOS) that comprehensively utilizes the GPS system of the United States and the GLONASS system of Russia; It is to establish a second-generation global navigation satellite system completely independent of the G...

AI Technical Summary

Problems solved by technology

[0016] The existing ionospheric refraction error correction methods and derived improved methods all have one thing in common. They are all modeled for ionospheric TEC parameters or ionospheric additional time delays, and the correction accuracy is not high, or the model parameters Problems or deficiencies in the realization of various projects such as complexity, or high cost of site deployment and broadcasting

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