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Time synchronization method, communication ground station and user terminal

A time synchronization and user terminal technology, applied in the field of satellite communication, can solve the problems of reducing communication efficiency, lack of large-scale application of geostationary orbit satellite communication system, and affecting the accuracy of TDMA time slots, so as to achieve low cost, improve capture speed and communication efficiency Effect

Active Publication Date: 2016-08-17
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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Problems solved by technology

However, satellites in low-inclination geosynchronous orbits must consider the impact of satellite motion on signals when performing satellite communication application services. First, satellite motion will introduce Doppler frequency shifts in communication signals, prolonging the capture time; secondly, satellite motion The distance between the satellite and the user changes periodically, which affects the accuracy of the TDMA time slot. When a large number of users communicate, it is easy to collide with communication data and reduce the efficiency of communication.
In view of this, there is currently no large-scale application of satellite communication systems in geosynchronous orbits with small inclination angles

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  • Time synchronization method, communication ground station and user terminal
  • Time synchronization method, communication ground station and user terminal
  • Time synchronization method, communication ground station and user terminal

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Embodiment Construction

[0069] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0070] The basic principle of the system time synchronization method is that the user terminal calculates and corrects the path delay and Doppler frequency deviation between the user receiver and the satellite; the time synchronization equipment of the communication ground station measures and corrects the time delay between the communication ground station and the satellite. The path delay, Doppler frequency offset and satellite transponder clock drift between them ensure that the time when the signal arrives at the commun...

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Abstract

The invention discloses a time synchronization method and a time synchronization device based on small inclination synchronous orbit satellite communication system. The time synchronization device provided by the invention comprises a communication ground station and a user terminal, used for performing Doppler frequency compensation on received and transmitted signals, time synchronization on the whole network and pre-deviation on frequency of the transmitted signal. According to the method and device, the variation of a path and the Doppler frequency deviation of signals between the user terminal and the SIGSO satellite can be compensated based on the terminal; the communication ground station measures and compensates the path delay, Doppler frequency deviation and satellite transponder clock drifting between the communication ground station and the satellite; via time synchronization and pre-deviation on transmitting frequency, the communication ground station and the transmitter of the user terminal ensure that the time when the signal arrives the communication ground station or the terminal is just the begin of a communication time slot distributed by the system, which can greatly improve the capture speed of the communication signal, and thus the system capacity of the communication system is improved, and the unit communication cost is reduced.

Description

technical field [0001] The invention relates to satellite communication technology, in particular to a time synchronization method based on a small-inclination synchronous orbit satellite communication system, a communication ground station and a user terminal. Background technique [0002] With the development of satellite communication technology, geostationary orbit satellite resources and orbital resources are becoming more and more scarce. At the same time, the cost of launching a geosynchronous orbit satellite is very high. Therefore, the utilization rate of space satellites is maximized and the satellite's in-orbit Lifespan has become a research hotspot in satellite communication applications. [0003] In 2002, Academician Ai Guoxiang of the Chinese Academy of Sciences led the invention of a navigation system based on communication satellites (patent application number: CN200410046064.1, name of invention: transponder satellite communication navigation and positioning...

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Application Information

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IPC IPC(8): H04J3/06
CPCH04J3/0635
Inventor 李圣明马利华王晓岚胡超侯金爽
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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