VSAT (Very Small Aperture Terminal) network time synchronization method

A technology of time synchronization and synchronization modules, which is applied in radio transmission systems, advanced technologies, electrical components, etc., can solve problems such as time synchronization and system memory, and achieve strong practicality, creativity, and high phase accuracy.

Inactive Publication Date: 2018-06-08
四川安迪科技实业有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

But this method only realizes the frequency synchronization, and does not realize the time synchronization and system memory function

Method used

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  • VSAT (Very Small Aperture Terminal) network time synchronization method
  • VSAT (Very Small Aperture Terminal) network time synchronization method

Examples

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Embodiment Construction

[0030] Such as Figure 1 ~ Figure 2 Shown, a kind of VSAT network time synchronization method, comprises base station NCR (Network ClockReference, network clock reference) sending module and earth station NCR receiving synchronization module, described earth station NCR receiving synchronization module comprises NCR extracting module, local clock counting module , phase detection module, second-order loop filter, frequency control word summation module, DA (Digital to Analog, digital-to-analog conversion) module, VCO (Voltage-controlled oscillator, voltage-controlled oscillator) module, flash storage module and delay time compensation module;

[0031] The NCR sending module of the reference station sends the NCR when the nth frame (order of transmitting physical frames), and latches the local time information when the SOF (Start of Frame, frame start sign) of the nth frame is valid, and simultaneously sets Frame into an NCR time frame, and perform FEC (Forward Error Correctio...

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Abstract

The invention discloses a VSAT (Very Small Aperture Terminal) network time synchronization method. The method comprises a reference station NCR (Network Clock Reference) transmission module and an earth station NCR receiving synchronization module, wherein the earth station NCR receiving synchronization module comprises an NCR extracting module, a local clock counting module, a phase discrimination module, a two-odor loop filter, a frequency control word addition module, a DA (Digital to Analog) module, a VCO (Voltage-controlled oscillator) module, a flash memory storage module and a delay compensation module. Through adoption of the VSAT network time synchronization method, frequency and time synchronization can be realized rapidly, and meanwhile a power-down memory function is realized.The method has relatively high practicability and creativity.

Description

technical field [0001] The invention relates to the field of VSAT (Very Small Aperture Terminal, Very Small Antenna Earth Station) satellite communication, in particular to a time synchronization method for a VSAT network. Background technique [0002] The VSAT (Very Small Aperture Terminal, Very Small Antenna Earth Station) station satellite link has an outbound link from the main station to the VSAT station, and an inbound link from the VSAT station to the main station. There are many satellite multiple access methods for the link of the main station: frequency division multiple access, code division multiple access and time division multiple access. And for TDMA (Time Division Multiple Access, time division multiple access) transmission system, since what is assigned to each earth station is a specific time slot, so each earth station must use the same carrier frequency in the time slot assigned to itself The signal is sent to the satellite, and after being amplified, it...

Claims

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Application Information

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IPC IPC(8): H04B7/185
CPCH04B7/18519H04B7/18582H04B7/18589Y02D30/70
Inventor 陈勇
Owner 四川安迪科技实业有限公司
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