CN202257089U

CN202257089U - Time synchronization device

Info

Publication number: CN202257089U
Application number: CN2011203767159U
Authority: CN
Inventors: 王少雷; 韩草铭; 钱飞
Original assignee: HANGZHOU CREATE INFORMATION TECHNOLOGY Co Ltd
Current assignee: HANGZHOU CREATE INFORMATION TECHNOLOGY Co Ltd
Priority date: 2011-09-28
Filing date: 2011-09-28
Publication date: 2012-05-30
Anticipated expiration: 2021-09-28

Abstract

The utility model discloses a time synchronization device, which comprises a wireless beacon signal antenna, a wireless beacon signal receiving module, a signal processing module and a button and signal display module. The wireless beacon signal antenna is connected with the wireless beacon signal receiving module, and the signal processing module is respectively connected with the wireless beacon signal receiving module and the button and signal display module. The time synchronization device can achieve accurate time synchronization by using wireless time scale signals.

Description

A kind of time synchronism apparatus

Technical field

The utility model relates to the time synchronized field, relates in particular to a kind of time synchronism apparatus.

Background technology

Time synchronized all has practical demand in many industries such as Chinese national economy development, national defense construction, national security and department, and many civil equipment also be unable to do without time synchronized.For instance, the video camera of supervisory systems such as security protection, traffic all need produce vernier time signal now and be superimposed upon on the output video, through the time that video superposeed, can when playing back videos, know the live event time of origin.The industrial control process that has requires the lock in time precision to be second a level or a high precision more; Synchronously will be in the ms level like computer supervisory control systems numerous in the electric system, protective device, fault oscillograph equal time, means of transportation for example solar energy spike etc. also need adopt synchronous flicker pattern to strengthen indicating effect.

In order to carry out exact time synchronization, must calibrate the oscillator signal of generations such as crystal oscillator, this just needs a reliable and stable timing signal, relatively is typically at present through network to make networked devices carry out time service and GPS time service.The network time service is divided into wide area network time service and LAN time service.The wide area network time service precision can reach the 50ms level usually, but surpasses 500ms sometimes, and this is because the router path of each process maybe be inequality.Now also there is not better way that the time error in this different path delays is eliminated fully.There is not router problem in path delay in the LAN time service, thereby time service precision can mention inferior Millisecond in theory, but its range of application is very limited, and under this mode, also needs a precise time signal source simultaneously.The built-in NTP service of Windows, its highest time service precision also can only reach the 10ms level in LAN.In addition, for a large amount of non-networked devices, can't obtain the standard time through network.The present application cost of GPS Service of Timing is also than higher, and can't be in indoor use.Therefore research and develop a kind of high-precision time synchronizing apparatus cheaply, have urgent demand and wide application prospect.

Wireless timing signal is a kind of wireless, mature technology that distributed areas are wider, not limited by weather, region and movable carrier.Mainly contain modes such as long wave time service, shortwave time service, the time service of AM/FM radio station at present, time service precision can be distinguished corresponding different application requirements successively from high to low.

The long wave time service is through carrier frequency phase encoding and pulsed modulation mode; With the specified high-power broadcast carrier frequency time signal that is 30-300KHz; Good stability, antijamming capability are strong, timing accuracy can reach the microsecond magnitude because of its signal is propagated for the long wave time dissemination system; Being topmost in the world at present continental rise time service means, is the important component part of contemporary highly reliable time service system.Present Chinese long wave time service coding is also still unexposed, but Japanese JJY60 long wave time signal can reliable reception in the east China province.

The shortwave time service is a kind of audio frequency time service mode, and time service precision is the millisecond magnitude.Four kinds of carrier frequency of 15MHz replace the broadcast frequency time standard signal with 2.5,5,10 24 hours every days of BPM in China, cover the whole nation.It is a kind of cheapness and method easily that the radiothermy time signal carries out time-frequency transmission and calibration, for the user's advantageous particularly that requires synchronism deviation in the 1ms magnitude.

The every integral point in AM/FM radio station or the least bit all can be broadcast time signal; In general; The radio station is carried out integral point and is given the correct time background sound is mourned in silence; Do not mourn in silence even if do not carry out background sound,, be easy to isolate effective time signal yet through ball bearing made using because time signal is the sound signal that is higher than ordinary people's acoustic frequency.Radio station integral point time signal time service precision is a second-time, but the relative long wave of AM/FM, shortwave signal are stable and signal intensity is big, can satisfy the less demanding device requirement of timing accuracy.

In order to remedy the deficiency of prior art, can utilize wireless timing signal to carry out time synchronized.

The utility model content

To the problems referred to above that exist in the prior art, the utility model provides a kind of time synchronism apparatus.

The utility model provides a kind of time synchronism apparatus, comprises wireless beacon signal antenna, wireless beacon signal receiving module, signal processing module and button and signal display module;

The wireless beacon signal antenna is connected with the wireless beacon signal receiving module, and signal processing module is connected with button and signal display module with the wireless beacon signal receiving module respectively.

In one example, signal processing module comprises pulse per second (PPS) generation module, timing code generation module, time preset module, UTC Universal Time Coordinated signal resolution module, alternative module, counting module and crystal oscillator; The alternative module is connected with counting module with pulse per second (PPS) generation module, timing code generation module, UTC Universal Time Coordinated signal resolution module respectively; The time preset module is connected with the timing code generation module, and the UTC Universal Time Coordinated signal resolution module also is connected with crystal oscillator with counting module.

In one example, the wireless beacon signal is long wave time signal, shortwave time signal or amplitude modulation/FM radio station time signal.

The utility model can realize utilizing wireless timing signal to carry out exact time synchronization.

Description of drawings

Come the utility model is done further explain below in conjunction with accompanying drawing, wherein:

Fig. 1 is the system chart of the utility model;

Fig. 2 is the signal processing module circuit structure diagram.

Embodiment

BPM is following one minute signal distributions in China: 0-9 second, 15-24 second, 30-39 second, 45-54 second is the second signal of UTC Universal Time Coordinated UTC; 25-28 second, 55-58 second is the second signal of universal time UT1; The 29th second, the 59th second is to broadcast the platform station symbol, and a whole sub-signal was wherein arranged on the 59th second.The standard time signal of universal time coordinated UTC and universal time UT1 produces with 1KHz standard audio modulated carriers, and a second signal length is respectively 10ms (UTC) and 100ms (UT1), and whole sub-signal is 300ms.Consider that universal time coordinated is is benchmark with the atomic clock; Universal time be with the earth rotation time be benchmark; The former second at interval relatively accurately, evenly; Therefore when receiving universal time coordinated UTC, carry out time calibration, do not carry out time calibration when receiving universal time UT1, by inner high precision clock output time-code and pulse per second (PPS).

Table 1 is seen in the day plan of broadcasting of BPM, and for realizing 24 hours precise synchronization, according to the plan of broadcasting, receives 5MHz or 10MHz frequency that frequency point selection was broadcast in 24 hours.

1BPM day broadcast planning chart by table

Frequency (MHz)	The UTC time	Beijing time
			?2.5	07:30-01:00	15:30-09:00
?5	00:00-24:00	00:00-24:00
			?10	00:00-24:00	00:00-24:00
?15	01:00-09:00	09:00-17:00

Fig. 1 is the system chart of the utility model.For guaranteeing higher sensitivity, short-wave receiving antenna according to the frequency accurate Calculation after coiling, receiving circuit adopts the crystal Frequency Stabilization Technique.Disturb for effectively suppressing picture frequency, the 10MHz frequency is adopted the double conversion technology, the 5MHz frequency adopts single-conversion to get final product.After receiving circuit is received short-wave signal, demodulate the audio frequency time-code, the input signal processing module is handled behind the steady spoke.

After signal processing module is received the audio frequency time-code, frequency is counted and the measuring-signal duration, thereby screened useful signal, as what receive is then output time sign indicating number and pulse per second (PPS) of UTC signal, otherwise according to this machine high precision clock output time sign indicating number and pulse per second (PPS).Signal processing module must carry out time preset, if do not preset, module will only be exported a whole sub-signal and a second signal, can be used for needs only minute and an application scenario of second aliging.

Fig. 2 is the signal processing module electrical block diagram, comprises the pulse per second (PPS) generation module, timing code generation module, time preset module, UTC signal resolution module, counting module and high precision crystal oscillator.Counting module is the nucleus module of system, and all the other each modules are all coupled except that the time preset module.The high precision crystal oscillator is that total system provides base when stablizing.Counting module is counted the time base that the high precision crystal oscillator produces; Send pulse per second (PPS) generation module and timing code generation module with the result; The pulse per second (PPS) generation module is exported the high precision pulse per second (PPS) in view of the above, and the timing code generation module is by standard and code check output date and the time set.The timing code generation module can be accepted the input of time preset module, and system time is slightly calibrated.The UTC signal resolution module is responsible for receiving wireless time code signal and demodulation, decoding, and send counting module relatively the result, and counting module carries out essence to system time in view of the above and calibrates.The UTC signal resolution module can be configured to continuous working, timing working, three kinds of patterns of triggering work, to adapt to different demands.

The above is merely the preferred implementation of the utility model, but the utility model protection domain is not limited thereto.Any those skilled in the art all can carry out suitable change or variation to it in the disclosed technical scope of the utility model, and this change or variation all should be encompassed within the protection domain of the utility model.

Claims

1. a time synchronism apparatus is characterized in that, comprises wireless beacon signal antenna, wireless beacon signal receiving module, signal processing module and button and signal display module;

2. time synchronism apparatus as claimed in claim 1 is characterized in that, signal processing module comprises pulse per second (PPS) generation module, timing code generation module, time preset module, UTC Universal Time Coordinated signal resolution module, alternative module, counting module and crystal oscillator; The alternative module is connected with counting module with pulse per second (PPS) generation module, timing code generation module, UTC Universal Time Coordinated signal resolution module respectively; The time preset module is connected with the timing code generation module, and the UTC Universal Time Coordinated signal resolution module also is connected with crystal oscillator with counting module.

3. time synchronism apparatus as claimed in claim 1 is characterized in that, the wireless beacon signal is long wave time signal, shortwave time signal or amplitude modulation/FM radio station time signal.