CN104980244A

CN104980244A - Input line time-delay compensation apparatus and method of time synchronization equipment

Info

Publication number: CN104980244A
Application number: CN201510377153.2A
Authority: CN
Inventors: 黄成�; 张良玺
Original assignee: Datang Telecom Chengdu Information Technology Co Ltd
Current assignee: Datang Telecommunication Science & Technology Co., Ltd.
Priority date: 2015-07-01
Filing date: 2015-07-01
Publication date: 2015-10-14
Anticipated expiration: 2035-07-01
Also published as: CN104980244B

Abstract

The invention discloses an input line time-delay compensation apparatus and method of time synchronization equipment. The apparatus comprises a fixed time-delay compensation module capable of receiving a satellite reference signal and an adjustable time-delay compensation module capable of receiving a ground reference signal; the fixed time-delay compensation module can output a 1PPS time signal to a time-delay compensation control module; the adjustable time-delay compensation module can output a ground reference 1PPS signal to the time-delay compensation control module; and the time-delay compensation control module can control the adjustable time-delay compensation module. According to the invention, when a protection switching phenomenon occurs at a transmission network, the time-delay compensation control module adds the abrupt change value to a previous time-delay compensation value and writes the new value to the adjustable time-delay compensation module, so that the 1PPS time signal outputted by the adjustable time-delay compensation module is aligned at the 1PPS time signal before the abrupt change and thus alignment with the UTC time is realized. Therefore, the output signal precision of the time synchronization equipment is not influenced.

Description

Time synchronism equipment incoming line compensation of delay device and method

[technical field]

The invention belongs to the communications field, be specifically related to a kind of time synchronism equipment incoming line compensation of delay device and method.

[background technology]

Time synchronism equipment external reference source generally has satellite reference time signal and ground reference time signal.Satellite navigation system transmitting time signal is to the satellite antenna head on ground, and time signal is outputted to time synchronism equipment by feeder line by satellite antenna head, and feeder line can cause the delay of time signal, and the method generally by arranging fixing feeder line compensation of delay solves.And ground reference time signal kind is many, some time signal is come by transmission network, some time signal is then that higher level's time synchronism equipment is directly sended over by cable, on cable, time signal also can be caused to postpone by the signal of higher level's time synchronism equipment, can solve by arranging fixed line compensation of delay, the time signal of transmission network then has the delay of network, and may to there is pretection switch in network cause transmission path to change, thus network delay saltus step, if arrange constant time lag to compensate, will saltus step be there is in the reference signal of time synchronism equipment.If time synchronism equipment does not add control, then the time signal precision exported will decline.

[summary of the invention]

The object of the invention is to overcome above-mentioned deficiency, a kind of time synchronism equipment incoming line compensation of delay device and method is provided, the time synchronizing signal network delay uncertain problem because signal transmission network pretection switch causes can be solved.

In order to achieve the above object, a kind of time synchronism equipment incoming line compensation of delay device, comprise the constant time lag compensating module that can receive satellite reference signal and the adjustable delay compensating module that can receive ground reference signal, constant time lag compensating module can export 1PPS time signal to compensation of delay control module, adjustable delay compensating module can export ground reference 1PPS signal to adjustable delay compensating module, and adjustable delay compensating module can control adjustable delay compensating module.

A kind of time synchronism equipment incoming line delay compensation method, comprises the following steps:

Step one: after constant time lag compensating module receives satellite reference signal, by 1PPS time signal phase place fixed lead in satellite reference 1PPS signal, according to the length of satellite feeder line, calculate fixing compensation of delay value, after overcompensation, strict and the UTC time unifying of the 1PPS time signal that constant time lag compensating module exports, exports compensation of delay control module to;

Step 2: ground reference 1PPS signal is exported to compensation of delay control module after receiving ground reference signal by adjustable delay compensating module;

Step 3: first compensation of delay control module is locked in the 1PPS time signal that constant time lag compensating module exports, after locking, the 1PPS time signal of compensation of delay control module also with UTC time unifying, at this moment compensation of delay control module calculates the 1PPS time signal after alignment and the phase deviation of ground reference 1PPS signal, the 1PPS time signal controlling adjustable delay compensating module is exported to adjustable delay compensating module according to phase deviation also with UTC time unifying;

Step 4: when transmitting the network generation pretection switch of ground reference signal, corresponding network delay can be undergone mutation, at this moment compensation of delay control module carries out Real-Time Monitoring to network delay, when the ground reference signal inputted exceedes the sudden change of threshold value, and keep stable after sudden change, then think that transmission network there occurs pretection switch; At this moment after this sudden change is just added with compensation of delay value before by compensation of delay control module, re-write adjustable delay compensating module, the 1PPS time signal that such adjustable delay compensating module exports just is alignd with the 1PPS time signal before sudden change, namely with UTC time unifying, achieve the Based Intelligent Control of compensation of delay, namely complete time synchronism equipment incoming line delay compensation method.

In described step 4, threshold value is 100ns.

Compared with prior art, the present invention makes satellite reference signal and ground reference signal contrast, and phase deviation is adjusted as adjusted value adjustable delay compensating module, thus reach time synchronism equipment incoming line compensation of delay, when transmission network generation pretection switch, after this sudden change is just added with compensation of delay value before by compensation of delay control module, re-write adjustable delay compensating module, the 1PPS time signal that such adjustable delay compensating module exports just is alignd with the 1PPS time signal before sudden change, namely with UTC time unifying, pass through this method, time synchronism equipment output signal accuracy can be realized unaffected.

[accompanying drawing explanation]

The module frame chart of Fig. 1 position time synchronism equipment incoming line of the present invention compensation of delay device.

[embodiment]

Below in conjunction with accompanying drawing, the present invention will be further described.

See Fig. 1, a kind of time synchronism equipment incoming line compensation of delay device, comprise the constant time lag compensating module that can receive satellite reference signal and the adjustable delay compensating module that can receive ground reference signal, constant time lag compensating module can export 1PPS time signal to compensation of delay control module, adjustable delay compensating module can export ground reference 1PPS signal to adjustable delay compensating module, and adjustable delay compensating module can control adjustable delay compensating module.

Step 3: first compensation of delay control module is locked in the 1PPS time signal that constant time lag compensating module exports, after locking, the 1PPS time signal of compensation of delay control module also with UTC time unifying, at this moment compensation of delay control module calculates the 1PPS time signal after alignment and the phase deviation of ground reference 1PPS signal, the 1PPS time signal controlling adjustable delay compensating module is exported to adjustable delay compensating module according to phase deviation also with UTC time unifying.

Step 4: when transmitting the network generation pretection switch of ground reference signal, corresponding network delay can be undergone mutation, at this moment compensation of delay control module carries out Real-Time Monitoring to network delay, when the ground reference signal inputted is more than the sudden change of 100ns, and keep stable after sudden change, then think that transmission network there occurs pretection switch; At this moment after this sudden change is just added with compensation of delay value before by compensation of delay control module, re-write adjustable delay compensating module, the 1PPS time signal that such adjustable delay compensating module exports just is alignd with the 1PPS time signal before sudden change, namely with UTC time unifying, achieve the Based Intelligent Control of compensation of delay, namely complete time synchronism equipment incoming line delay compensation method.

Claims

1. a time synchronism equipment incoming line compensation of delay device, it is characterized in that, comprise the constant time lag compensating module that can receive satellite reference signal and the adjustable delay compensating module that can receive ground reference signal, constant time lag compensating module can export 1PPS time signal to compensation of delay control module, adjustable delay compensating module can export ground reference 1PPS signal to adjustable delay compensating module, and adjustable delay compensating module can control adjustable delay compensating module.

2. a time synchronism equipment incoming line delay compensation method, is characterized in that, comprises the following steps:

Step 4: when transmitting the network generation pretection switch of ground reference signal, corresponding network delay can be undergone mutation, at this moment compensation of delay control module carries out Real-Time Monitoring to network delay, when the ground reference signal inputted exceedes the sudden change of threshold value, and keep stable after sudden change, then think that transmission network there occurs pretection switch, at this moment after this sudden change is just added with compensation of delay value before by compensation of delay control module, re-write adjustable delay compensating module, the 1PPS time signal that such adjustable delay compensating module exports just is alignd with the 1PPS time signal before sudden change, namely with UTC time unifying, achieve the Based Intelligent Control of compensation of delay, namely time synchronism equipment incoming line delay compensation method is completed.

3. a kind of time synchronism equipment incoming line delay compensation method according to claim 2, it is characterized in that, in described step 4, threshold value is 100ns.