BP-polynomial model fusion-based regional ionized layer vertical total electron content modeling method

Abstract

The invention discloses a BP-polynomial model fusion-based regional ionized layer vertical total electron content modeling method. The method comprises the following steps of S1, obtaining puncture point geographic longitude and latitude information and ionized layer vertical total electron content information of a regional observation point, and converting obtained data to obtain a solar hour angle difference, geomagnetic latitude and local time information; S2, building a polynomial model and performing modeling on the ionized layer vertical total electron content information, thereby obtaining a polynomial model value and a corresponding model residual error value; S3, building a BP neural network error compensation model; and S4, forecasting ionized layer vertical total electron content residual errors fitted by the polynomial model by utilizing the BP neural network error compensation model, thereby compensating the polynomial model. According to the method, the problem of model errors in a conventional polynomial model can be solved; the precision of regional ionized layer vertical total electron content modeling can be improved; and the stability is high.

Description

technical field [0001] The invention relates to the field of global navigation systems, in particular to a modeling method for regional ionospheric vertical total electron content based on BP-polynomial model fusion. Background technique [0002] In the research and application of GNSS ionospheric modeling, there are mainly two types of ionospheric models: one is the empirical model, including the Klobuchar model, IRI model, and Bent model used in GPS. The empirical model is more complicated and the correction effect is poor. It is generally not suitable for high-precision ionospheric delay modeling and GNSS positioning; the other is a fitted ionospheric model based on high-precision GNSS dual-frequency observation data. According to different modeling areas, the commonly used ionospheric model Including the following three: polynomial model (POLY), spherical harmonic function model (SHF), trigonometric series (TSF) model. When studying and analyzing the change law of the r...

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Problems solved by technology

[0003] Purpose of the invention: the purpose of this invention is to provide a method that can solve the model error problem existing in the traditional polynomial model, to improve the accuracy of regional ionospheric vertical total electron content modeling

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