Correcting method for global satellite navigation system troposphere zenith delay

Abstract

The invention discloses a correcting method for global satellite navigation system troposphere zenith delay, and relates to correcting technologies for troposphere zenith delay of radio signals in satellite navigation application. The method includes the following steps that (1), a global troposphere zenith delay original data base is built; (2), a global troposphere zenith delay data base is built; (3), a reseau and global troposphere zenith delay simplifying data base is built; (4), the annual mean value and annual variation amplitude of the troposphere zenith delay are calculated; (5), a global troposphere zenith delay correcting parameter table is stored; (6), the troposphere zenith delay is corrected through a receiver end. The correcting method for the global satellite navigation system troposphere zenith delay has the advantage that elaborate space and time changes of the global troposphere zenith delay are fully considered, simple calculation formulas and a reasonably optimized space reseau and parameter table storing method are adopted, so that the correcting method has the advantages of being high in accuracy, easy and convenient in calculation and high in efficiency, and meanwhile requirements for storing space of the receiver end are lowered.

Description

technical field [0001] The invention relates to the tropospheric zenith delay correction of radio signals, in particular to the tropospheric zenith delay correction technology of the global satellite navigation system. Background technique [0002] Global Navigation Satellite System (Global Navigation Satellite System), referred to as GNSS, its working principle is: multiple satellites continuously operating in orbit at a distance of 20,000 to 40,000 kilometers from the earth's surface continuously send L-band radio signals, passing through the earth's atmosphere (including the ionosphere and Neutral atmosphere) reaches the ground and is captured by GNSS receivers, and the captured signals can be used for navigation, positioning and timing by processing and measuring them. At present, the global satellite navigation system mainly includes: GPS of the United States, GLONASS of Russia, GALILEO of the European Union and Beidou system of China which are under construction. [0...

AI Technical Summary

Problems solved by technology

However, the IGGtrop method also has some obvious problems. For example, it takes into account the detailed seasonal variation of the tropospheric zenith delay in the equatorial region. The algorithm is more complicated, but it does not bring significant improvement in accuracy.

The three-dimensional spatial grid of the IGGtrop method is not designed according to the spatial characteristics of the tropospheric zenith delay, but simply adopts a globally uniform grid point spacing, which causes a lot of waste of parameters, and leads to a large number of parameters in the parameter table and a large storage space. Large and low computational efficiency, not conducive to the actual application of navigation and positioning

In addition, the IGGtrop correction technology currently uses a floating-point parameter storage method, and the storage efficiency is relatively low

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