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Satellite communication system time synchronization method based on TDMA

A satellite communication system and time synchronization technology, which is applied in the field of wireless communication and satellite communication, can solve the problems of high price and complicated usage, and achieve the effect of simple method, real-time calibration and guaranteed time synchronization

Active Publication Date: 2019-11-01
广州天链通信科技有限公司
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AI Technical Summary

Problems solved by technology

However, most demodulation chips on the market usually only support FDMA point-to-point communication functions, can resolve NCR (network clock reference) and support TDMA function. The price of demodulation chips is generally high, and the hardware circuit generally needs to be used with a dedicated clock circuit. Complicated to use

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  • Satellite communication system time synchronization method based on TDMA
  • Satellite communication system time synchronization method based on TDMA
  • Satellite communication system time synchronization method based on TDMA

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Embodiment Construction

[0030] The present invention is mainly aimed at the TDMA network time calibration of the satellite communication system, and firstly describes the basic concept of the TDMA timing service of the satellite communication system. Such as figure 2 Shown is a schematic diagram of TDMA time calibration. Wherein, the user station A and the user station B transmit the signal back to the main station X through TDMA. The system pre-allocates a specific time slot structure, and the time calibration results of user stations A and B are calculated and calibrated through the NCR (Network Clock Reference) value issued by the master station X, so as to ensure that the two user stations are at the satellite transponder Align on the TDMA alignment point O on the time axis.

[0031] For TDMA systems, first introduce the concept of time slots. For the user station, the transmission of the satellite radio signal is converted from a digital sample to an analog signal, and then transmitted. The...

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Abstract

A satellite communication system time synchronization method based on a TDMA comprises: arranging a clock with the frequency of fx at a sending station end to serve as a network reference clock NCR, each clock period counter of the network reference clock NCR being + 1, and performing zero clearing every 24 hours; taking a clock count value NCR_Value of a sending station end as a timestamp and inserting the timestamp into the forward link signal sequence at regular time; the user station calculating to obtain a link total time count value NCR _ X according to the received NCR_Value and a preset NCR_offset of the geographical location information of the terminal; calculating offsets of the frame F, the time slot Slot and the symbol Symbol according to the NCR_X, and performing continuous accumulation by taking f_symbol as a reference clock to serve as a time slot adjustment parameter to perform time slot adjustment on the user station. The method does not depend on whether the demodulation chip supports a standard NCR analysis function or not, belongs to open-loop calibration, and is real-time in calibration and high in precision.

Description

technical field [0001] The invention relates to the field of wireless communication, especially the field of satellite communication, and specifically discloses a time synchronization method for a satellite communication system based on TDMA. Background technique [0002] Since satellite mobile communication is less affected by ground equipment and geographical environment, it is widely used in aerospace, ocean transportation, disaster prevention and mitigation, and special communications. The satellite communication system under the MF-TDMA system mainly includes a central station and a user station; the topology is a star, which is realized by forward DVB broadcasting and one or more incoming carriers using time division multiple access (TDMA); the central station The data downlink is realized through the forward broadcast channel; the user station realizes the data return through the time division multiple access channel. [0003] A typical MF-TDMA satellite communicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04B7/185H04B7/212
CPCH04B7/18582H04B7/2125H04J3/0661
Inventor 陈朝飞
Owner 广州天链通信科技有限公司
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