Method for establishing wide-area and local-area fused high-precision ionospheric scintillation model

Abstract

The invention provides a method for establishing a wide-area and local-area fused high-precision ionospheric scintillation model, which comprises the following steps of: a) acquiring original signal data of an air-based COSMIC satellite and a high-latitude area foundation CHAIN observation station, and preprocessing the acquired original signal data; b) performing spatial-temporal characteristic preliminary analysis on the acquired ionospheric scintillation signal data; (c) establishing a wide-area ionospheric scintillation ANN model; (d) testing the wide-area ionospheric scintillation ANN model; (e) establishing a high-latitude polar region local ionospheric scintillation ANN model; and (f) testing the high-latitude polar region local ionospheric scintillation ANN model. According to the method, two kinds of observation data of COSMIC and CHAIN are utilized, the ionospheric scintillation occurrence condition model is represented in the form of the time change rate index ROTI of the total electron content, and the ionospheric scintillation model in the high-latitude region is established by independently using CHAIN station data, so that wide-area and local-area fusion is achieved, the receiver performance is improved, and the satellite navigation positioning precision is improved.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a method for establishing a high-precision ionospheric scintillation model with wide-area and local-area fusion. Background technique [0002] many [0003] The ionosphere is a part of the Earth's atmosphere, the area above 60 km above the Earth's surface. Molecules and atoms in the atmosphere of this region are partially ionized by solar radiation (mainly ultraviolet radiation and X-rays), and there are a large number of positive ions and free electrons. The American Institute of Electrical and Electronics Engineers standard (1969) defines the ionosphere according to the angle at which radio waves are affected: "The part of the Earth's atmosphere in which the number of ions and electrons present is sufficient to affect the propagation of radio waves". [0004] With the rapid development of the global satellite navigation system, the ionosphere has become a necessa...

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Problems solved by technology

[0008] Therefore, in order to solve the problem of large ionospheric scintillation prediction errors in the prior art, a high-precision ionospheric scintillation model establishment method with wide-area and local fusion is needed

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