A Beidou navigation system ionospheric delay estimation method and corresponding receiving device

Abstract

The invention provides an ionized layer delaying estimation method of a Beidou navigation satellite system. The method comprises the followings steps: a step of roughly calculating longitude and latitude: enabling a Beidou navigation satellite receiver to calculate a satellite position and a pseudo-range according to a satellite ephemeris to receive rough longitude and latitude position information of the receiver; a step of calculating longitude and latitude of a breakthrough point: calculating longitude and latitude information of the breakthrough point of a participating positioning satellite according to the obtained rough longitude and latitude position information and participating positioning satellite position information; an ionized layer delaying correction step: determining a grid point containing the breakthrough point and ionized layer correction delaying information containing the breakthrough point according to grid ionized layer delaying information sent by a GEO (Geostationary Earth Orbit) satellite of the Beidou navigation satellite system and the longitude and latitude information of the breakthrough point; and a step of calculating accurate longitude and latitude: revising an observation equation of the Beidou navigation satellite receiver according to the ionized layer correction delaying information of the breakthrough point and calculating the accurate longitude and latitude. With the adoption of the technical scheme, the grid ionized layer delaying information of a GEO satellite ephemeris of the Beidou navigation satellite system can be used for reducing ionized layer errors and the navigation positioning precision is improved.

Description

Technical field [0001] The present invention involves an estimation method and corresponding receiving device of the Beidou navigation system, especially the method and corresponding receipt of the navigation positioning results according to the electrical ionization layer parameters and grid ionization information of the navigation system of the Beidou satellite navigation system.Device. Background technique [0002] The ionization layer is a atmospheric layer of 50 to 1000km from the ground above the ground. It is affected by the ultraviolet rays, X -rays, and high -energy particles. The atmospheric molecules and atoms of the area form a large number of free electronics and positive ions.The speed changes.Studies have shown that in the Beidou (or BD or Compass) Navigation Satellite System), the ionization layer delay is one of the most important sources of error affecting the positioning accuracy.The ionizing delay is generally about a few meters, but when the sun sunspots are ...

AI Technical Summary

Problems solved by technology

For input data with different spatial spans, the mean and variance of the Klobuchar estimation model error are basically unchanged, and its spatial distribution is shown as an alternating distribution of maximum or minimum value areas, lacking small and gentle areas with errors, and the Klobuchar model is A form of fitting function based on the realization of the existing model, although the change of phase, amplitude, etc. time is a constant, it will also lead to a large ionospheric error, which limits its application in many occasions with high positioning requirements

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