GNSS ionization layer delay precise modeling method suitable for Chinese region

Abstract

The invention discloses a GNSS ionization layer delay precise modeling method suitable for a Chinese region. The geographical coordinates of the latitude and the longitude of a cross point are converted into coordinates under an established spherical crown coordinate system, so as to acquire the range of the latitude and the longitude of the cross point under the spherical crown coordinate system. The change range of the latitude and the longitude of the cross point is projected and converted into a global coordinate system. A spherical harmonic function is used to establish a regional ionization layer total electron content (TEC) model. The ionization layer delay precise modeling method suitable for the Chinese region is constructed. Compared with the existing method, the method provided by the invention has the advantages that through rotation projection and conversion, the distribution of the ionization layer cross point meets the requirement of the spherical harmonic function on physical quantity distribution in the form; ill-conditioned problems are solved when the spherical harmonic function is applied to regional modeling; the precise describing ability of the spherical harmonic function for global change physical quantity is effectively used; non-integral order in a spherical crown harmonic function is avoided; and the complexity of ionization layer TEC modeling calculation is reduced.

Description

technical field [0001] The invention belongs to the fields of satellite navigation, radio wave propagation and space ionosphere, and in particular relates to a GNSS ionosphere delay modeling method suitable for the Chinese region. Background technique [0002] GNSS (Global Navigation Satellite System) generally refers to a radio navigation system based on space satellite constellations, which originated from the Doppler satellite navigation system established by the U.S. Air Force in the late 1950s. Since the U.S. Department of Defense officially announced in December 1993 that GPS has the ability to work globally, GNSS systems that have been built or are under construction around the world include the U.S. GPS, Russia's GLONASS, China's BeiDou, and the European Union's Galileo. The construction and development of GNSS reflect the comprehensive strength of economy, military and national defense of the country that owns the system to a certain extent. At present, GNSS-owning...

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Problems solved by technology

[0005] In view of this, the present invention provides an accurate modeling method for GNSS ionospheric delay suitable for China, which reasonably solves the ill-conditioned problem existing when spherical harmonics are applied to regional ionospheric TEC modeling through rotational projection transformation, effectively Using the excellent mathematical properties of spherical harmonics, it improves the overall accuracy and reliability of regional GNSS ionospheric delay modeling

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