When not watching the clock synchronization server Xi'an, do not worry buy clock server
gps satellite school system Introduction
When the satellite correction system by providing in the LAN GPS clock server, receiving the standard time of the GPS satellite, and to TCP / IP protocol will be sent by the access time to the respective LAN standard workstation join the network, time synchronization proofreading workstations to provide a precise time reference standard, each workstation to solve the time is not accurate, the problem is not synchronized. Avoid errors due to time and unnecessary loss, and the system time and GMT is fully synchronized; at the same time the system can drive clocks display and LCD monitors in foreign time display for easy viewing of staff time.
Satellite school when the system works
The overall design of the system correction of hardware and software are a network popular client / server model, awarded by the runtime server when the software time server via a LAN, a standard TCP / IP and other network protocols, the broadcast standard time to the respective display terminal ; software running on the client terminal the respective correction network terminal, the machine will synchronize with the clock time synchronization server in the LAN, thereby achieving a full synchronization of the time the entire LAN.
Using the time as the GPS satellite signal acquisition time source, read raw data output from the GPS receiver, the time for processing to extract the relevant information and upload time server. Meanwhile, the system also remains a network outlet, can drive a number of large number of liquid crystal or LED digital terminal via a local area network, in some public places such as the transfer machine room, display the time, to facilitate reading the staff to see the time.
Due to strong GPS anti-jamming ability, work around the clock, protected from the weather, so the system that is to select it as a time reference source. GPS control box to the front end of the core, external GPS satellite antenna, is responsible for receiving satellite transmitting the satellite signal to the ground, after demodulation processing raw satellite data output time, the RS-232 interface sent by the time server.
LAN time server consists of a linked into the local area network as the PC. On which a network time synchronization system server software. In addition to the completion of the original time server serial port to receive the satellite data were extracted time information, and the proof of the date and time, providing a benchmark for other time proofreading computer terminal on the LAN, but also automatically search for TCP / IP local area network within the entire display terminal, and the synchronization period set in advance, for each TCP / IP terminal display timing of the time, date refresh proofing.
Synchronous clock system components
Clock server
SYN2136 type clock server is based on a time server support NTP Linux system / SNTP protocol. The clock server receives GPS satellite timing signals by providing accurate network device (user) NTP / SNTP protocol, standard, safe, reliable and versatile service time, the front panel displays the year, month, day, hour, and the number of stars received star working status and other information.
Product Features
1) providing a channel physical isolation interfaces timing NTP network;
2) The front panel display date, day, hour, number of teeth and satellite working condition;
3) Support windows, LINUX, UNIX, SUN SOLARIS , IBM AIX operating systems such as time synchronization;
4) When the satellite correction system supports DHCP function, when all the access to the satellite network device's correction, the system can automatically obtain an IP address when the satellite correction, so as to achieve clock synchronization;
5) Support for multiple time servers or multiple network ports can be set to the same IP, mutually redundant backup;
6) Support WEB, SSH encrypted communication parameter management and monitoring software provided;
7) data set file can export and import;
8) the network configuration page English switch provided username and password and host name;
9) load, running time, memory status and other real-time traffic and real-time monitoring;
10) built-in clock source can be selected TCXO, OCXO, and rubidium atomic clock module tame;
11) serial port timing, sent once every second, minute, second, year, month, day, time information;
12) the output timing of a synchronization signal ( 1PPS), the TTL interface output;
GPS clock server role and the way of time
GPS is widely used in network synchronization, the need for data synchronization, the chronograph time keeping the art, high stability, non-accumulation of errors, without geographical climate and other environmental conditions, easy to use, provides accurate clock time information. GPS receiving module receives accurate time information from the satellite, after the encoding process, provide time information and a second clock pulse signal to the network server through the RJ45 interface.
When mode GPS clock server are generally two kinds: point to point on the grading of time
(1) peer-to-GPS clock when the external mode is set to a first server NTP Server, the server system as a second NTPServer. All devices (controllers, engineers, station, operator stations, etc.) are the first and the GPS clock server ie system. When the GPS is not working or the network is, and then when the Ovation own system server pair. As many clients, so in this way is very high demand for GPS clock server. Because all devices directly to priority, when compared to grade the way, disperse the danger.
(2) classification system of the embodiment 2 when the computer is provided to the GPS client, to direct the GPS and other devices within as NTPServer Ovation system. In this way greatly reduce the burden on GPS clock server, but as NTP Server operator station or engineer station demanding.
Point of time when the mode of the mode classification and different characteristics , performance and quality of the GPS clock server device chosen depending on the chosen program, the station operator or engineer station. Select any one way rely on GPS clock server security and reliable operation.
Satellite time synchronization system illustrated
SYN2136 type clock servers. The dual-mode server built Beidou time service module to GPS / BeiDou time reference signal to NTP / SNTP protocol synchronization for all network computers, servers, DVR, NVR, controllers and other equipment, network time unity.
SYN2136 type clock server use high-precision GPS receiver / receiver signal input Compass II, high reliability reference time signal, and the method of operation of high-tech , precise time synchronization to the signal output from the time keeping circuit synchronized GPS / Beidou input time reference, very good short-term and long-term stability of the output of high-precision synchronization signal.
Server using modern high-tech tame timing algorithm, the frequency of the oscillator in the satellite signal and kept highly accurate frequency / time synchronization. Since the BNC output from the output port server second timing pulse time signal is the second signal output of the oscillator, synchronized with the satellite signal, but not affected by the second pulse signal hopping satellite brought.
The server clock using modern high-tech surface mount technology production, no hard drive design, not subject to regional climate and other environmental conditions, cost-effective, simple operation and maintenance and so on, for unattended. The product may be a computer network, computer applications, process control management systems, e-commerce systems, online B2B system, database maintenance, and save hard disk recorders and other smart devices provide precise standard time signal and time stamp services.
Implementation of content
SYN2136 ntp type time synchronization server receives a GPS satellite signal, the satellite signal Compass II generated second synchronizing pulse, the time serial information signals, timing the network interface, the system configuration information of various kinds is automatically saved, the time scale is established to achieve synchronization time unified practical electronic equipment
Antenna installation
This device uses GPS / Beidou satellite signal receiving antenna as one receiving antenna, i.e., antenna receiver using a (head), a length of 30 meters antenna feed, the antenna receiver is a passive antenna.
The upper level of the antenna for an outdoor / terrace / Balcony, white mushroom patches of the field of view should not be an obstacle, in order to avoid interference on the satellite functions, the antenna requires no separate power feed from the power supply on the host.
Preparation Before Installation
1, check the antenna is complete, check whether the antenna connection is loose, the situation is falling, (if any consultation please contact the manufacturer to replace)
2, various interface devices to check whether solid, such as: network interface, serial port, and the like grounding post
3, when the front panel display device can not receive the satellite, the plurality of white mushroom head position for a few star result try to eliminate the problem of the antenna or equipment problems.
4, attachment is complete as checked with the manufacturer of the power line, an antenna, an antenna holder, expansion screw, an optical disk, serial cable and the like.
Power and boot display step
Preparation for electricity
a) the instrument out of the box, flat on the console or cabinet.
b) Check the power supply shall meet rating requirements, specifications and the description related to the provisions of 3.3.
c) The antenna set up on the roof and other open areas.
D) After checking the machine should panel power switch in the off position, the power supply after confirming the access;
e) In case of power failure (off), the antenna access connector and the output signal lines;
LCD display information boot
The front panel liquid crystal display to provide the user the date and time information display. Date and time information includes year, month, day, hour, minute and second. Front panel LCD display time is GMT.
When the machine is powered on (cold start), it is shown below:
Then, "1PPS" light flashes once per second.
About 3 seconds, begins 08 hours 00 minutes 01 seconds start time (go bell). And are given as shown below:
After receiving the satellite signal, and time effective, as the LCD display (FIG example):
The top row shows a liquid crystal display date GPS satellites receive satellite number 10, the number of pieces of receive satellite Compass 10, time status is valid.
If the display is:
At this time, it indicates that the satellite signal is not received, or an antenna has been disconnected.
As the machine after first receiving the correct reference time, the unit will automatically maintain the original time continues to go, so the LCD screen or "A", said the current time output from this unit is still valid, or can use.
Installation of equipment
1, the device is a standard 1U chassis can be installed in a standard cabinet by mounting screws
2, the timing when the antenna is mounted on a white segment antenna holder using a screw or through an expansion in a manner fixed to the housing mounted to the top or on the terrace or platform, to ensure that the surrounding obstacles can not be white mushroom head (e.g., trees, towers , tall billboards, etc.) block.
3 , the power cord into the power supply at the first device, after seated, then three-phase power supply is inserted into the other end of AC220V mains.
4, after determining the correct screen switching device is pressed, the device lit up, evidencing device starts normally.
5, a cable connected, at one end connected to the back of the network interface device, connected to the other end of the core switches. Marked "reserved" interface identifier are unavailable.
Pilot scheme
After the commissioning phase in project development and implementation phase, following the adoption of the overall system at the beginning of the test, which can enter the commissioning phase, the system test run for a period of one week.
Commissioning the principles to be followed:
1, during the test run, synchronous technology negative system and all equipment will be full responsibility: to ensure that any defect or failure of systems or equipment in 24 hours (Day holiday is no exception) repair; if the defect or malfunction of systems and equipment very serious, will re-start trial operation after repair;
2, comprises a phase of commissioning: Open use, operation and function evaluation apparatus, stability and reliability of the user; necessary artificial test;
3, during the trial operation, synchronous technology to repair, correct or replace any equipment does not meet the technical specification requirements;
4, after the completion of commissioning the system, which can project into the acceptance phase.
Commissioning range includes all subsystems, we have two main aspects of the work of the pilot phase of the pilot program will be discussed and management measures.
Quality Assurance System
Synchronous technology accumulated over the years when the frequency of the industry, precipitation and organized a very advanced industry standards, project management and quality management system, quality assurance is very mature management concepts and tools, such as a 9000 audit by .
For this project, synchronous technology will dispatch a senior interior Management Group and Project Manager to participate in project quality management, internal supervision team leader as Quality Manager of the project, responsible for ensuring that projects adhere to the standards of quality assurance system to ensure ntp delivery time synchronization server quality synchronization accuracy and synchronization effect, design and management, and many other aspects.