Automatic equalization phase-lock compensation method of time delay symmetric difference
A technology of time delay and automatic equalization, applied in the direction of digital transmission system, electrical components, transmission system, etc., can solve problems such as unsatisfactory
Active Publication Date: 2011-02-16
DATANG TELECOM TECH CO LTD
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Moreover, the change that seriously affects the stability and reliability of the time synchronization network is random, so the UTC time synchronization scheme that uses the phase-locked technology of the narrower filtering bandwidth must be selected to meet TD-SCDMA and other 3G, 4G, so the existing technology Can not meet the synchronization technology of TD-SCDMA and other 3G and 4G networks
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[0031] The present invention is described in further detail below in conjunction with accompanying drawing:
[0032] The time delay asymmetric difference automatic equalization phase-locking compensation method proposed by the present invention specifically includes the following steps:
[0033] 1) First, reduce the master-slave relative frequency deviation and aging deviation with the greatest influence and most complicated changes to ≤5×10 after UTC frequency synchronization -14 .
[0034] 2) On the slave station, measure the loopback value C, where the loopback value C=T x +T y ; the T x The amount of delay from master to slave, the T y It is the delay amount from the slave station to the master station.
[0035] 3) Use loopback value C=T x +T y , that is, the period is C and the frequency is And the loosely coupled phase-locked technology of frequency discrimination, phase detection and zero-crossing detection according to the time measurement scale to realize freq...
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The invention discloses an automatic equalization phase-lock compensation method of a time delay symmetric difference. The method comprises the following steps of: (1) firstly, reducing the master-slave relative frequency difference and the aging difference of a clock to be not more than 5*10<-14>; (2) calculating a loop back value on a slave station according to the equation C=Tx+Ty; (3) realizing frequency synchronization by using the loop back value, namely period C, the frequency 1 / C pps and the phase frequency discrimination zero-crossing detection loose coupling phase-lock technique according to time measurement scales; and (4) locking adaptive equalization within an equation shown in the specification is the delay time Tx and Ty of a transmission channel vary due to the outside world after the frequencies of the master station and the slave station are synchronized. The method realizes the phase frequency discrimination zero-crossing detection (loose coupling) phase-lock technique by fully utilizing the slave station clock from a master station to the slave station in the unified fusion networking mode, the real-time frequency phase-lock synchronization technique compared with the master station is realized, and thus, the master-slave relative frequency surplus difference, the daily fluctuation error and the aging error are strictly controlled within a small range.
Description
technical field [0001] The invention belongs to the technical field of UTC synchronization, and relates to an automatic compensation of time delay asymmetry difference, in particular to an automatic equalization phase-locking compensation method for time delay asymmetry difference. Background technique [0002] Coordinated Universal Time, also known as Universal Time, Universal Standard Time, Coordinated International Time, or UTC for short. It comes from English "Coordinated Universal Time" / French "Temps Universel Cordonné". It is a time measurement system that is based on atomic time and seconds and is as close as possible to universal time in terms of time. China adopts ISO 8601-1988 "Data Element and Exchange Format Information Exchange Date and Time Representation" (GB / T 7408-1994), which is called the International Coordinated Time. This time system is used in many Internet and World Wide Web standards, for example, the Network Time Protocol is a way to coordinate un...
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IPC IPC(8): H04L7/033H04L7/00
Inventor 李忠文孟志才
Owner DATANG TELECOM TECH CO LTD