GNSS occultation ionospheric residual correction method and system, device and storage medium

Abstract

The invention provides a GNSS occultation ionospheric residual correction method and system, a device and a storage medium. The method comprises the steps of: preprocessing GNSS occultation original observation data, vTEC maps data and geomagnetic field observation data to obtain GNSS occultation geometric data, ionospheric data and geomagnetic field data; based on the GNSS occultation geometric data, a three-dimensional NeUoG ionospheric mode and the ionospheric data, calculating an electron density profile at the location of an ionospheric puncture point on an incident ray side and an emergent ray side; based on the GNSS occultation geometric data, an IGRF geomagnetic field mode and the geomagnetic field data, calculating a geomagnetic field intensity profile along a signal path at the location of the ionospheric puncture point on the incident ray side and the emergent ray side; based on the electron density and the geomagnetic field intensity along the signal path, calculating a bending angle ionospheric residual profile. The method of the invention can be used in the atmospheric parameter inversion of a single GNSS occultation event, weakens the influence of the ionospheric residual, obtains a high-precision GNSS occultation curved angular profile, and is efficient and reliable.

Description

Technical field [0001] The application of the present invention relates to the field of GNSS radio occultation atmospheric detection technology and meteorology, in particular to a method, system equipment and storage medium for GNSS occultation ionospheric residual correction. Background technique [0002] GNSS occultation detection technology can obtain the vertical profile of physical parameters such as high vertical resolution, high precision, no calibration, long-term stability, all-weather atmospheric refractive index, density, temperature, humidity and pressure. GNSS occultation data has been used in climate analysis and medium-term numerical weather forecasting on a twenty-year scale. However, as the altitude increases, the influence of the ionosphere becomes greater, and the accuracy of inverting atmospheric parameters gradually decreases. The accuracy of occultation data at the top of the stratosphere and the bottom of the middle layer (25-60km altitude range) can no lon...

AI Technical Summary

Problems solved by technology

At present, the more advanced Kappa correction method is based on the assumption of neutral atmosphere and spherical symmetry of the ionosphere, without considering the specific distribution of electron density along the signal path of a single occultation event and the influence of the geomagnetic field on the ionosphere residual of the bending angle, and its reliability and less accurate

[0004] To sum up, the bending angle ionospheric residual is the main factor that restricts the high-precision inversion of GNSS occultation data in the 25–60 km altitude range; the existing bending angle ionospheric residual correction method is based on the neutral atmosphere and ionospheric symmetry Assumption, ignores the influence of uneven distribution of electron density along the occultation signal path and the influence of the geomagnetic field, and is a simple statistical empirical model, its reliability and accuracy are poor

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