Doppler compensation method for high-speed rail or aircraft VSAT broadband satellite communication

Abstract

The invention discloses a Doppler compensation method for high-speed rail or aircraft VSAT broadband satellite communication. A server or an embedded system independent of a VSAT broadband satellite communication terminal is connected with the VSAT broadband satellite communication terminal and a GPS receiver or a Beidou receiver; software is operated by the server or the embedded system; Doppler frequencies generated by the high-speed rail or aircraft VSAT broadband satellite communication are calculated in real time according to the longitude, latitude and height data of a GPS or a Beidou navigator; the Doppler frequencies are supplied to the VSAT broadband satellite communication terminal in real time; the Doppler effect is dynamically compensated; therefore the existing non-high speed VSAT broadband satellite communication terminal can be applied to the broadband satellite communication of a two-dimensional or three-dimensional high-speed motioning rail or aircraft; any modification of software and hardware is unnecessary; the economic benefits are clear; and the technical risk is relatively low.

Description

technical field [0001] The invention belongs to the field of VSAT broadband satellite communication, and in particular relates to a Doppler compensation method for VSAT broadband satellite communication in frequency division-time division multiple access (FD-TDMA) mode on high-speed rails or airplanes. Background technique [0002] Compared with the traditional single-channel single-carrier (SCPC) satellite communication, the current mainstream VSAT broadband satellite communication mostly adopts the frequency division-time division multiple access (FD-TDMA) method to achieve high reuse of satellite bandwidth. The time division multiple access (TDMA) communication method has extremely high requirements on the time synchronization of both ends of the communication. [0003] In recent years, VSAT broadband satellite communication has been widely used in the field of mobile communication, such as television broadcasting, emergency communication, disaster prevention and relief, ...

AI Technical Summary

Problems solved by technology

However, this dynamic compensation method using hardware is expensive and has poor stability.

Since the current mainstream VSAT broadband satellite communication systems in the world are not designed for high-speed motion environments, if this hardware Doppler dynamic compensation method is used in the existing VSAT broadband satellite communication system, it is necessary to modify the existing VSAT The hardware of the broadband satellite communication system undergoes large-scale transformation, and if a dedicated VSAT broadband satellite communication system is designed for a high-speed motion application environment, huge R&D costs and operating costs will be required

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