A Calculation Method of Drift Velocity of Ionospheric Irregularities Based on Phase Screen Theory

Abstract

The invention relates to a method for calculating the drift speed of ionospheric irregularities based on the phase screen theory to obtain the relationship between the phase change and the propagation path; at the receiver end, the spatial change of the phase can be converted into the relationship between the phase change and time, It is related to the time change of ionospheric electron content TEC; the time change of ionospheric electron content TEC is related to the time change rate of ROTI index; according to the ionospheric amplitude scintillation index and signal-to-noise ratio, the ionospheric irregularities are obtained in The drift velocity in the IGRF coordinate system and its components in the x and y directions are related to the time rate of change of ROTI, the scintillation index of the ionospheric amplitude, the signal-to-noise ratio and the satellite elevation angle. The present invention obtains the relationship between the drift speed of ionospheric irregularities and the time rate of change of ROTI index, ionospheric amplitude scintillation index S4, signal-to-noise ratio and satellite elevation angle, and the method can realize ionospheric irregularities and the resulting In-depth study of the coupling mechanism between ionospheric scintillations.

Description

technical field [0001] The invention relates to a method for calculating the drift velocity of an ionospheric irregular body based on a phase screen theory, belonging to the field of the ionosphere. Background technique [0002] At present, satellite navigation technology has become an important part of weapons in modern warfare for all countries in the world. The Beidou satellite navigation system is a satellite positioning and navigation system independently developed and controlled by China. It has realized positioning, navigation, timing, short message and other services in the Asia-Pacific region; BDS will play an important role in the development of my country's economic, military and social development. [0003] The space part of the satellite navigation system is mostly located above 20,000 kilometers, and the transmission of navigation signals passes through the ionosphere, which is inevitably affected by the scintillation effect of the ionosphere. The effect of io...

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Problems solved by technology

[0005] Carrano, C.S., Groves, K.M., Rino, C.M., Doherty, P.H.(2016).A technique for inferring zonal irregularity drift from singlestation gnss measurements of intensity(s4)and phase(σφ)scintillations.Radio Science,51(8):1263- 1277.) Obtain the zonal drift velocity of ionospheric irregularities mainly through the ground-based GNSS observation network, ground observation radar and ionospheric altimeter; the scholars of Boston College in the United States recently proposed to use the ionospheric scintillation monitor to obtain the ionospheric scintillation Index and navigation observation data to infer the shape of ionospheric irregularities, the method has some enlightenment, but its calculation requires high-frequency (50Hz) original navigation observations, thus reducing the universality of the method

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