Gps network time


GPS Network Time Synchronization — Masterclock, Inc.

Whether you're trying to get people to show up for a meeting or managing a scalable cloud-based business application, synchronicity is vital. Countless stakeholders and machines play essential roles in your processes. Keeping them all on the same timetable lets your organization move forward as a cohesive unit. 

As far as networked hardware is concerned, you can't afford timing disparities. Here's how network time synchronization works and how to make your practices more effective.

Network Time Synchronization Explained: A Brief Intro to Timing Protocols

There are many ways to ensure that your servers, security systems, media recorders and other devices are operating in sync. Fortunately, you don't have to resort to manually setting clocks or cobbling together your own timing tools and shell scripts. 

The existence of widely accepted protocols makes it possible to deploy a compliant system and rest assured of its ability to track time as expected. To get started, let's take a quick look at two of the most common timekeeping systems: Network Time Protocol and Precision Time Protocol.

Network Time Protocol

The NTP standard employs servers that supply clients, such as the computers in your network, with current Coordinated Universal Time, or UTC, information in response to individual requests. Although your hardware can ask for the present time from many different servers in the network, some devices provide more accurate data than others due to factors like system lag and latency. 

The timekeeping servers in these networks are arranged in distinct strata, also known as layers. The most accurate devices exist in Stratum 0, and they include atomic, radio and other high-precision clocks, such as those found in NIST laboratories and GPS satellites. Stratum 1 servers, also known as primary time servers, are connected directly to Stratum 0 devices as well as their same-level peers. 

This protocol also: 

  • Lets clients connect to multiple NTP servers for data backups, heightened accuracy and testing purposes
  • Corrects for communication latency and individual clock drift
  • Uses a standardized, 64-bit UDP packet that can theoretically achieve picosecond (trillionth of a second) timing and determine dates within a 136-year range
  • Permits peer-to-peer communication, broadcasting, multicasting, calibration and secure MD5 hash algorithms

Another variant of this protocol, known as SNTP or Simple Network Time Protocol, employs the same packet and message format. The major difference is that SNTP is significantly less accurate. Since clients cannot obtain timing data from multiple sources or use MD5 checksums, they're vulnerable to general network inaccuracies and malicious agents that intentionally provide incorrect time stamps. 

Precision Time Protocol

PTP, defined in IEEE 1588, facilitates applications where the NTP lacks sufficient accuracy. By utilizing hardware-based timestamping, it provides more accurate synchronization.

Instead of clients requesting timing information, master clocks initiate contact by sending them data that they can use to stay in sync. As a PTP grandmaster communicates with the clocks it's synchronizing, the information passing from one machine to the other gains a timestamp at each stop. MORE

Why is timestamping important? These sequential records serve as references that can help quantify how much network latency exists between a grandmaster and a given slave clock. Such features give IEEE 1588-compliant devices the ability to:

  • Make up for latency introduced by local network conditions and correct timestamps to account for such delays
  • Use an algorithm called best master clock, or BMC, to choose the fittest clock source from a range of candidates
  • Reliably track time down to the nanosecond, or billionth of a second, and picosecond levels
  • Enable varied network topographies, such as all of the slave clocks connecting to a single grand master timing reference or the grandmaster sending timing data to boundary clocks that then synchronize other slaves

Why the Global Positioning System and Time Synchronization Go Hand in Hand

By using dedicated hardware devices, PTP networks gain the power to minimize latency that could arise as a result of unforeseen factors. For instance, timekeeping software routinely has to contend with challenges like a lack of local operating system resources and unquantifiable delays in network communications. 

There are numerous ways to overcome such hurdles. One widely accepted technique uses synchronization references that include highly-accurate GPS satellites .

The Global Positioning System

The Global Positioning System, commonly known as GPS, does more than just let consumers find their way around during vacation road trips. This system consists of fixed constellations of special orbiting satellites that each carry:

  • Stabilized Stratum 0 atomic clock hardware
  • Advanced location tracking circuitry
  • Transmitters that constantly broadcast their position and clock time

These satellites are all synchronized to the same time and have known locations due to their geosynchronous orbits. As a result, receivers can listen to multiple broadcast sources and use trilateration, which is somewhat similar to triangulation, to determine their own position and time deviation.

Making Up for Lost Time

Although the Global Positioning System is very accurate, it's not without problems. The satellite network employs its own time standard, and this doesn't quite match up with what we use here on Earth. 

The speed at which our planet rotates varies. This phenomenon is due to factors like:

  • Massive sea currents causing tidal acceleration that slows down our world's rotation and gradually lengthens its days
  • The movement of the fluid metallic core inside the Earth
  • Changing atmospheric currents

To deal with these factors, Coordinated Universal Time introduces a leap second that gets tacked on to the time to keep it precisely locked with atomic time. However, unlike the highly predictable leap year these extra seconds are added as needed to ensure that UTC and mean solar time, or UT1, never differ by more than 0.9 seconds. 

GPS doesn't accommodate these extra seconds, so it's still tied to the way UTC was in 1980. As a result, satellites must broadcast additional offset information to let receivers know how much they need to adjust their estimates. 

Real-world Implementations: What Should Users Look for in GPS NTP Server Hardware?

Different network timekeeping options all have their pros and cons. While accuracy is definitely a positive, it may be prohibitively expensive to equip every one of your networked machines with a direct link to a Stratum 1 source. Or you might find that your system control application places a greater value on local synchronization than it does on matching external UTC sources. 

How can you identify a timing solution that serves your purposes? Dedicated GPS NTP servers offer numerous advantages.

Legally Traceable Time

Traceability describes how the results of your time estimation relate to a specific reference. In the world of network timekeeping, for instance, you can build a chain of traceability that links your timing measurements to their sources. You can then use the chain to satisfy legal requirements.

For instance, you might provide stakeholders and users with accurate estimates of your measurements' total ambiguity by adding the uncertainties of the individual sources you utilized to calculate them. Such precision is vital when timing is required for critical applications, such as 

Network time servers that provide traceable time place you on firmer legal footing. By allowing you to offer an extra degree of precision in the form of uncertainty measurements, traceable time estimates help you avoid being deemed liable for losses caused by unavoidable inaccuracies.

Widespread Standards Compliance

The most effective servers don't only use NTP. They're also conversant with PTP and other standards. This means that you can integrate them seamlessly into a range of network configurations. 

Such flexibility also extends to the clock source side of the timekeeping architecture. Servers can use other geosynchronous satellite constellations, such as the Russian GLONASS system, in addition to the U.S. Global Positioning System for legally traceable. This practice is advantageous because systems that employ a greater number of data points can produce quicker, more precise time and positioning estimates. They can also accept various synchronizing signals over Ethernet, so it's possible to create a customized implementation that serves your purposes and satisfies your budget constraints. 

Which kinds of features should you look for? Keep an eye out for perks like:

  • NTP and IEEE 1588 PTP client and server functionality
  • GPS or GNSS reference
  • MD5 hash authentication
  • SSH for secure communication
  • IPv6 compatibility

Functional Features and Form Factor

As more enterprise, nonprofit and consumer computing operations shift to the cloud and other unique network architectures, the hardware they use has to evolve as well. Even if you're deploying your timing equipment indoors, the value of ruggedness can't be overstated. 

For instance, are you confident that your servers will be able to withstand the humidity in a hot automated warehouse if an air handler breaks in the middle of summer? What if your data center's infrastructure management systems fail? Your devices should be rated for a reasonably wide range of environmental and power supply conditions to ensure that unexpected fluctuations don't cause gaps in your operational continuity.

Also, remember that robustness isn't only physical. Reliable time servers can function properly even in the absence of satellite connections. In the event of signal loss, they use high-accuracy internal oscillators to keep counting the passage of fractional seconds. Since manufacturers calibrate these devices with great precision if a server loses source lock, the oscillator can compensate for any drift until  signals from GPS satellites or other sources is regained.

Other features make it easier to build unique networks that do more than just keep track of time. For instance, some servers feature programmable relays that you can use to toggle circuit switches according to a custom daily schedule. 

Implement Superior Network Timekeeping Today

You have many options for instituting effective network time synchronization, but the one thing that you can't afford is to forego it altogether. Although it's only natural to think about considerations like hardware cost, investing in timekeeping servers saves you money in the long run by:

  • Minimizing your organizational liability
  • Making it easier to maintain synchronicity
  • Operating more precisely
  • Providing your clients with heightened service accuracy

Choosing a network timekeeping server may not be your only concern when building a network, but it's definitely one of the most important. Whether you rely on IEEE 1588 or decide to stick with legally traceable time NTP implementations, your server needs to offer proven reliability, robustness and flexibility that can drive your operations forward.

Ready to learn more about GPS NTP and PTP server options and deployment strategies? Talk to a Masterclock specialist today. With devices like the NTP100-GPS, GMR1000  and GMR5000 in your network, it's never been simpler to ensure that your mission-critical operations are always on time. 

www.masterclock.com

gps network time - definition

Example sentences with "gps network time", translation memory

patents-wipoThe difference between true GPS network time and the measurement time is treated as a variable 'error' in measurement, the length of which is unknown.patents-wipoA method for modifying the system time of the network side includes: the MSC creates a GPS clock request message containing a time flag, and transmits the message in the form of A interface self-defining message to the BTS; the BTS receives the GPS clock request message, and returns a GPS clock respond message in the form of A interface self-defining message to the MSC; when the MSC receives the GPS clock respond message, the MSC obtains the single route delay based on the local system time and the time flag, and uses the GPS clock in the GPS clock respond message plus the single route delay as the new system time of the network side.UN-2As a result, a wide area of the Indonesian permanent GNSS stations network of continuous GPS networks operating in real-time mode throughout the archipelago was being developed.EurLex-2EGNOS Network time to GPS system time accuracypatents-wipoThe method includes: the master system device (1) synchronizes the local time according to the normally received Universal Time Coordinated (UTC) time from a Global Positioning System (GPS) satellite and the network clock aligned to the UTC time, and periodically broadcasts the local time to each network node which is performed as the slave system device (31, 32, 33) and required to perform time synchronization; and the slave system devices (31, 32, 33) synchronously update the local time according to the received local time of the master system device (1) and the local network clock aligned to the network clock of the master system device (1).patents-wipoA distributed orbit and propagation method for use in a predicted GPS or GNSS system, which includes a predicted GPS server (PGPS Server), a source of high accuracy orbit predictions (Orbit Server), a global reference network (GRN Server) providing real-time GPS or GNSS assistance data to the PGPS Server, a predicted GPS client (PGPS Client) running on a device equipped with a GPS or AGPS chipset.Common crawlThe TS-2540 provides an internal web interface for easy setup through the network and via the browser, reliable and secure network synchronization technology by combining multi-port, high-speed/high capacity network interfaces and versatile GPS timing receiver technology.patents-wipoBase stations in a wireless telecommunications network are calibrated to GPS system time by using position measurement data obtained from one or more hybrid mobile stations during regular position location sessions.patents-wipoAn apparatus and method for locating a remote station operating in analog mode, and that may not have a sense of network time, using an inverted GPS approach.patents-wipoIn one embodiment, the wall time is acquired from at least one of an internal UE clock, a GPS time, information broadcasted from the network, or information from a higher layer signaling.patents-wipoThe present invention relates to a wireless clock system for sea and includes: a signal converter for converting a signal transmitted from a GPS terminal for a ship; and a network time protocol (NTP) server that receives a network protocol converted signal from the signal converter, generates standard time information in a ship based on the received signal, and transmits the generated standard time information through a wireless communication network for time information synchronization.patents-wipoSynchronizing a Radio Network with End User Radio Terminals A Mobile Station that is able to receive GPS signals and compare the frequency of the GPS received time signal with a time signal from a network in order to determine the difference between the signals and communicate that difference back to the network.patents-wipoA time stamp distribution system and corresponding method for a cellular telecommunication network (10), wherein a time distributing master node (20) receives a unique time stamp value from a reliable time source (24), such as a GPS terminal device, and forwards this time stamp value to a plurality of time slave nodes (22a-22c) of the cellular telecommunication system, through the signalling network (14) of the cellular telecommunication network.patents-wipoThis technique may allow a packet network to provide clock synchronization services to the same level as time division multiplexing (TDM) networks and Global Positioning System (GPS).tmClassTransmission of information including infotainment, car performance and health information, GPS, accelerometer, GSM connectivity, vehicle diagnostics, network (social) connectivity, real-time navigation and traffic reports, and voice-interactive personal information management on network based systems or on-board consumer electronic devicespatents-wipoA method of calculating timing offsets in a mobile communications network using mobile terminals with A-GPS positioning functionality and a method of determining the position of mobile terminals without A-GPS functionality on the basis of said timing offsets.Giga-frenCBC Daily Time Broadcasts, Telephone Talking Clock, Computer Time and Date, Short Wave Broadcasts: Radio Station CHU, Network Time Protocol (NTP), and Global Positioning Data (GPS).cordisShe said that the events of 11 September reinforced the need for the EU to have a separate, additional satellite navigation network to provide an alternative to GPS and Glonass in times of heightened need.patents-wipoSystem for setting coarse gps time in a mobile station within an asynchronous wireless networkpatents-wipoBy setting a conflict detection mechanism, the present invention solves the problem of processing time synchronization when the GPS protocol messages and the PTP protocol messages synchronously exist on the device, and enables the time synchronization of the entire network.patents-wipoSystems and methods for providing gps time and assistance data in a packet switched mobile communications networkGiga-frenOfficial Time dissemination in electronic format, web pages, GPS data, QSL cards; research data, calibration and technical reports, international committee and comparison documentation Topics: computer time and date, time zones, network time protocol, global positioning, radio station CHU, atomic clocks, cesium fountain, frequency calibration, laser wavelength, optical frequency Program Record Number:Giga-frenOfficial Time dissemination in electronic format, web pages, GPS data, QSL cards; research data, calibration and technical reports, international committee and comparison documentation. Topics: computer time and date, time zones, network time protocol, global positioning, radio station CHU, atomic clocks, cesium fountain, frequency calibration, laser wavelength, optical frequency. Program Record Number:MultiUnParticipants were also given an overview of the modernization phases of the Brazilian Network for Continuous Monitoring of GPS, the aim of which is to provide real-time data from # stations and to compute wide-area differential GPS (WADGPS)-type corrections, to be transmitted to users in Brazil and the surrounding areas

Showing page 1. Found 53 sentences matching phrase "gps network time".Found in 4 ms. Translation memories are created by human, but computer aligned, which might cause mistakes. They come from many sources and are not checked. Be warned.

en.glosbe.com

gps network time - definition

Example sentences with "gps network time", translation memory

patents-wipoThe difference between true GPS network time and the measurement time is treated as a variable 'error' in measurement, the length of which is unknown.patents-wipoA method for modifying the system time of the network side includes: the MSC creates a GPS clock request message containing a time flag, and transmits the message in the form of A interface self-defining message to the BTS; the BTS receives the GPS clock request message, and returns a GPS clock respond message in the form of A interface self-defining message to the MSC; when the MSC receives the GPS clock respond message, the MSC obtains the single route delay based on the local system time and the time flag, and uses the GPS clock in the GPS clock respond message plus the single route delay as the new system time of the network side.UN-2As a result, a wide area of the Indonesian permanent GNSS stations network of continuous GPS networks operating in real-time mode throughout the archipelago was being developed.EurLex-2EGNOS Network time to GPS system time accuracypatents-wipoThe method includes: the master system device (1) synchronizes the local time according to the normally received Universal Time Coordinated (UTC) time from a Global Positioning System (GPS) satellite and the network clock aligned to the UTC time, and periodically broadcasts the local time to each network node which is performed as the slave system device (31, 32, 33) and required to perform time synchronization; and the slave system devices (31, 32, 33) synchronously update the local time according to the received local time of the master system device (1) and the local network clock aligned to the network clock of the master system device (1).patents-wipoA distributed orbit and propagation method for use in a predicted GPS or GNSS system, which includes a predicted GPS server (PGPS Server), a source of high accuracy orbit predictions (Orbit Server), a global reference network (GRN Server) providing real-time GPS or GNSS assistance data to the PGPS Server, a predicted GPS client (PGPS Client) running on a device equipped with a GPS or AGPS chipset.Common crawlThe TS-2540 provides an internal web interface for easy setup through the network and via the browser, reliable and secure network synchronization technology by combining multi-port, high-speed/high capacity network interfaces and versatile GPS timing receiver technology.patents-wipoBase stations in a wireless telecommunications network are calibrated to GPS system time by using position measurement data obtained from one or more hybrid mobile stations during regular position location sessions.patents-wipoAn apparatus and method for locating a remote station operating in analog mode, and that may not have a sense of network time, using an inverted GPS approach.patents-wipoIn one embodiment, the wall time is acquired from at least one of an internal UE clock, a GPS time, information broadcasted from the network, or information from a higher layer signaling.patents-wipoThe present invention relates to a wireless clock system for sea and includes: a signal converter for converting a signal transmitted from a GPS terminal for a ship; and a network time protocol (NTP) server that receives a network protocol converted signal from the signal converter, generates standard time information in a ship based on the received signal, and transmits the generated standard time information through a wireless communication network for time information synchronization.patents-wipoSynchronizing a Radio Network with End User Radio Terminals A Mobile Station that is able to receive GPS signals and compare the frequency of the GPS received time signal with a time signal from a network in order to determine the difference between the signals and communicate that difference back to the network.patents-wipoA time stamp distribution system and corresponding method for a cellular telecommunication network (10), wherein a time distributing master node (20) receives a unique time stamp value from a reliable time source (24), such as a GPS terminal device, and forwards this time stamp value to a plurality of time slave nodes (22a-22c) of the cellular telecommunication system, through the signalling network (14) of the cellular telecommunication network.patents-wipoThis technique may allow a packet network to provide clock synchronization services to the same level as time division multiplexing (TDM) networks and Global Positioning System (GPS).tmClassTransmission of information including infotainment, car performance and health information, GPS, accelerometer, GSM connectivity, vehicle diagnostics, network (social) connectivity, real-time navigation and traffic reports, and voice-interactive personal information management on network based systems or on-board consumer electronic devicespatents-wipoA method of calculating timing offsets in a mobile communications network using mobile terminals with A-GPS positioning functionality and a method of determining the position of mobile terminals without A-GPS functionality on the basis of said timing offsets.Giga-frenCBC Daily Time Broadcasts, Telephone Talking Clock, Computer Time and Date, Short Wave Broadcasts: Radio Station CHU, Network Time Protocol (NTP), and Global Positioning Data (GPS).cordisShe said that the events of 11 September reinforced the need for the EU to have a separate, additional satellite navigation network to provide an alternative to GPS and Glonass in times of heightened need.patents-wipoSystem for setting coarse gps time in a mobile station within an asynchronous wireless networkpatents-wipoBy setting a conflict detection mechanism, the present invention solves the problem of processing time synchronization when the GPS protocol messages and the PTP protocol messages synchronously exist on the device, and enables the time synchronization of the entire network.patents-wipoSystems and methods for providing gps time and assistance data in a packet switched mobile communications networkGiga-frenOfficial Time dissemination in electronic format, web pages, GPS data, QSL cards; research data, calibration and technical reports, international committee and comparison documentation Topics: computer time and date, time zones, network time protocol, global positioning, radio station CHU, atomic clocks, cesium fountain, frequency calibration, laser wavelength, optical frequency Program Record Number:Giga-frenOfficial Time dissemination in electronic format, web pages, GPS data, QSL cards; research data, calibration and technical reports, international committee and comparison documentation. Topics: computer time and date, time zones, network time protocol, global positioning, radio station CHU, atomic clocks, cesium fountain, frequency calibration, laser wavelength, optical frequency. Program Record Number:MultiUnParticipants were also given an overview of the modernization phases of the Brazilian Network for Continuous Monitoring of GPS, the aim of which is to provide real-time data from # stations and to compute wide-area differential GPS (WADGPS)-type corrections, to be transmitted to users in Brazil and the surrounding areas

Showing page 1. Found 53 sentences matching phrase "gps network time".Found in 5 ms. Translation memories are created by human, but computer aligned, which might cause mistakes. They come from many sources and are not checked. Be warned.

glosbe.com

GPS NTP Server For Accurate Network Time Synchronization

A GPS NTP server is a hardware appliance that provides an accurate time reference to a network of computers. By utilizing the Network Time Protocol (NTP), the device ensures that each computer on a network is synchronized to the correct time. Very precise timing information is obtained from the Global Positioning System (GPS) using a GPS antenna and receiver. The timing information is used to synchronize and maintain an internal clock. The clock then acts as a reference for network time clients.

The Need For Accurate Time

PC’s generally utilize low-quality, low-cost real-time clock components. They keep notoriously poor time. A collection of computers set to the same time can have wildly differing times after only a few hours. This can cause real problems for many applications and economic activities.

The Network Time Protocol

The Network Time Protocol (NTP) is a standard protocol for the transfer of time on a computer network. Originally designed by David L. Mills of the University of Delaware back in 1985, it is one of the oldest protocols still in regular use today. The protocol is a hierarchical protocol designed to provide a means of synchronizing client computers to a time server. The highest stratum time server references a very accurate hardware clock such as GPS, GLONASS or Galileo to maintain network time.

Using The Global Positioning System (GPS) For Accurate Time

The Global Positioning System is a satellite based navigation and positioning system operated and maintained by the US government. Three segments make up the system: space, control and user.

The space segment is a satellite system consisting of a constellation of 24 orbiting satellites. They are positioned so that every point on Earth can see at least 4 satellites at any one time. The satellites transmit time and position information to user segments.

The control segment is made up of a number of command stations that ensure correct operation of the system and periodically adjust satellite atomic clocks.

The user segment is the receivers and equipment used to provide time and positioning information based on the satellite transmissions.

GPS provides free-to-air positioning and navigation services. The system is widely used by marine and vehicle navigation systems.

In addition to providing positioning information, the GPS system also provides very accurate time. Each GPS satellite has multiple atomic clocks on board, which supplements GPS signals with very precise time data. Each atomic clocks is periodically adjusted to a master clock based on Earth to maintain synchronization of all the satellites.

GPS receivers decode the satellite signals to provide timing information synchronized to the atomic clocks. This enables equipment to obtain time accurate to billionths of a second without the expense of an atomic clock.

GPS NTP Time Server Applications

Precise time is critical to many applications and activities. Transaction processing, financial trading, data logging, machine monitoring and many other applications all rely on time synchronization. The availability of free-to-air atomic time has led to huge cost savings for companies and applications that rely on precise time. Lower cost hardware has also led to new and innovative applications.

Power companies are placing GPS NTP time servers in power plants and substations. This allows them to locate a power line break by analyzing the exact time of a fault as it propagates through the electrical grid.

Instrumentation often relies on accurate time. Equipment that may be located very far apart may require synchronization in order to act on or monitor linked events. For example, weather stations located in different parts of a country require synchronized instrumentation in order to accurate track weather systems.

Large institutions providing financial services and trading use GPS to very precisely time-stamp transactions. This provides a traceable record of the order of events as they occurred.

GPS Time Server Hardware

Equipment can receive GPS time and positioning information by using an antenna and receiver. The receiver is generally integrated into the equipment. The antenna is usually separate and connected to the receiver using a coax cable.

Ideally, a GPS antenna should be located where it has clear unobstructed view of the sky, such as a rooftop. TimeTools GPS time server receivers operate down to a single satellite in view. This allows an antenna to be positioned in a window or on the side of a building, saving on installation costs. Our receivers also have a high sensitivity mode which, in some circumstances, allows an antenna to be located inside a building with no line of sight to the sky.

Alternative GNSS Systems

There are other Global Navigation Satellite Systems in addition to GPS. The GLONASS system is the Russian equivalent to the GPS system. Beidou is the Chinese system. While the eagerly anticipated European Galileo system comes online in 2019. These systems can be used in combination with each other to provide high-reliability redundant timing.

Network Time Server Appliances

TimeTools T300 GPS NTP Time Server

The T300 is a cost-effective GPS network time server in a 1U high 19 inch rack-mountable enclosure.

The T300 provides an accurate source of time for computer networks of any size and can synchronize any NTP or SNTP compatible system.

The device features a high-sensitivity GPS receiver that can synchronize down to a single satellite in view. This provides cost savings by allowing antenna location on the side of a building or in a window rather than on a rooftop. Also, the high-sensitivity mode, in some circumstances, allows antenna location inside a building.

TimeTools T550 GPS Time Server

The T550 is a Multi-GNSS network time server. It can utilize GPS, GLONASS, Beidou and Galileo satellite systems to provide a high-reliability redundant time reference. The device can synchronize to within a few microseconds of UTC and support up to 100,000 NTP\SNTP clients.

TimeTools T100 GPS Network Time Server

TimeTools T100 is a very cost-effective GPS referenced NTP server in a compact enclosure. It requires 7.5V DC power, which is provided by a supplied AC mains adapter. The T100 provides an accurate source of time for computer networks and can synchronize any NTP or SNTP compatible system.

References

https://www.gsa.europa.eu/galileo/applications

http://www.gps.gov/applications/timing/

http://www.ntp.org/

 

timetoolsltd.com

Network Time Server | TS-900-GPS

Rack-mount GPS clock, antenna and NTP server software to convert an existing Windows (NT, 2000, 2003, XP) PC to a reliable stratum 1 time server

  • Installs as a service on a Windows Server adding Stratum 1 NTP Time Server functionality
  • Supports NTP and SNTP compatible clients
  • Front Panel display to easily assess Time and Satellite Status
  • GPS active antenna + 10m cable
  • Extension box and wiring tool included - GPS antenna cable length can be extended up to 1,000m (3,000ft) if required
  • Syslog error reporting
  • Email warning if GPS synchronisation is lost

TS-900-GPS Network Time Server

The TS-900-GPS Network Time Server solution consists of a GPS clock, GPS antenna and TimeSync software. The GPS clock is attached to a windows PC and the supplied TimeSync software once installed configures the machine as a Stratum 1 NTP time server. A two line display on the TS-900 unit shows run-time information for the GPS subsystem and UTC time.

Sitting safely behind your company firewall the TS-900 provides an elegant network timing solution allowing a Windows Server or a Domain Controller to supply accurate, secure UTC time to any other machine or digital clock on your network.

Key Benefits

  • Installs as a service on a Windows Server adding Stratum 1 NTP Time Server functionality
  • Supports NTP and SNTP compatible clients
  • Front Panel display to easily assess Time and Satellite Status
  • GPS active antenna + 10m cable
  • Extension box and wiring tool included - GPS antenna cable length can be extended up to 1,000m (3,000ft) if required
  • Syslog error reporting
  • Email warning if GPS synchronisation is lost
  • 3 years warranty
  • Lifetime Technical Support by phone or email

Request pricing »

Key Features

Type of receiver: Mounting (GPS Clock) Mounting (Antenna) Display: Network Interface: Interface to Server: Power supply: Working Temperature: Humidity: Timing Accuracy: Signal (GPS) Accuracy
Active GPS Antenna 12 channel
19" (2U) rackmount
Wall mounting bracket
LCD, 2 x 20 characters, with backlight
Via a Windows server or workstation
RS232 serial interface. (USB optional)
85 - 260V, 47 - 63Hz
0 - 50°C / 32 - 122°F
Max. 85%
Network: +/- 20 milliseconds, typicalGPS: 1 microseconds, relative to UTC
<1 µs, relative to GPS

Request pricing »

What's in the box

  • TS-900 unit + Power Lead
  • GPS Antenna (with a 10m/8 Core Cable - not shown) + power supply
  • Instruction Manual
  • NTP Software CD
  • Junction Box (to extend antenna cable - if necessary)
  • IDC Cable Tool (to insert extension cable into the junction box- if necessary)

Additional Extras

The following products are also available for use with the TS-900-GPS:

Request pricing »

www.galsys.co.uk

Using The GPS Clock For Network Time Synchronization

  • What is GPS and how does it work?
  • What is a GPS clock and what is different about GPS time?
  • How do we obtain GPS timing information?

The GPS system has gained prominence as a tool to provide highly accurate timing information, and is increasingly used as an accurate time reference for computer timing applications, such as NTP time servers. This article provides an introduction to the GPS system and how it can be utilised to provide precise timing information, along with an overview to the how GPS timing information is obtained.

 

TimeTools SR Series GPS NTP Time Servers Utilise GPS Technology To Obtain Highly Precise Time.

What is GPS and how does it work?

The Global Positioning System, more commonly known as GPS, is a satellite based navigation and positioning system. Theory behind the GPS system began in the 1970′s and was created by the US Department of Defence with the need to acquire extremely accurate positioning information for global navigation. The GPS system is made up of a constellation of 24 satellites which orbit the Earth, each of which feature on board an atomic clock which acts as a precise time reference.

How is GPS Time Different?

The GPS system offers an uninterrupted broadcast of GPS time. It can be utilised as a global application as GPS time is referenced to Universal Coordinated Time, (UTC), which is the same everywhere in the world, and will not alter with time zones. With the use of comparatively low-cost equipment, such as a GPS receiver and antenna, we are able to reference GPS time relatively easily.

The GPS signal is a very weak low-power radio transmission. Each GPS satellite transmits two carrier signals designated L1 and L2. Transmitted at 1575.42MHz the L1 frequency is utilised by civilian GPS receivers. For best results the GPS antenna is ideally situated on a rooftop which provides it with an optimal view of the sky to acknowledge passing satellites. GPS transmits in a straight line and can transcend clouds, glass and plastic. Satisfactory results can often be achieved by locating the GPS antenna in a window or on the side of a building, however consideration has to be given to metal and brickwork which blocks the signal.

What do we mean by GPS Clock?

The GPS system offers a free-to-air time synchronization service. Completely free of charge, it has no ongoing set-up, or subscription, fees. Numerous computer networks observe a GPS clock as a precise time reference. Highly accurate NTP servers systems synchronize Network Time Protocol (NTP) servers utilising the GPS system as an external reference clock. The high level of accuracy is achieved with a GPS receiver offering timing information to within nanoseconds of UTC time. This level of accuracy is quite often more than necessary for most computer network timing applications.

How do we obtain GPS Time?

GPS Antenna

The GPS antenna is typically a rounded device in design and often quite small being in the region of 900mm in diameter. GPS timing antennas are typically placed in a permanent, static location, ideally on a rooftop as discussed earlier . Acting as a signal amplifier the GPS antenna intensifies the GPS signal enabling it to transmitted down a cable, typically coax, to the GPS receiver.

Cable Requirements

A number of points have to be considered with regards to cabling GPS installations:

Cable length from antenna to GPS receiver.

The amplification of the GPS antenna, and the quality of the coax cable that is installed, has a direct effect on the cable distance that can be run between the GPS antenna and receiver. A typical GPS antenna may exhibit a gain of 35db. Low quality coax cable for example RG58 features a attenuation of 0.64db/meter at 1575MHz. As such, utilising RG58 cable a cable run of 55m can be achieved. Longer distances can be reached with higher quality coax cable, LMR400 cable, for instance, has the potential to provide an unassisted cable run of up-to 200m. Such high quality cable can however be expensive and can significantly increase installation costs. An alternative option is provided in utilising LMR200 cable which offers an unassisted cable distance of 80m. With the use of GPS amplifiers, which act to boost the GPS signal even further, it is possible to extend the cable length even further.

GPS Receiver Output

The GPS receiver in a NTP server continually issues position and timing data, typically transmitting the data both to and from the receiver via a RS232 serial interface. Standardised GPS interface protocols are in place of which the most renown is NMEA. The National Marine Electronics Association (NMEA) protocol is defined by a number of sentences, or character strings, which are transmitted at 4800 bits per second. Precise time and positioning data is a feature of each character string. NMEA sentences are generally not recognised as having the high level of accuracy required to act as a time reference, due to latencies involved in serial communication. As a result PPS, or pulse per second, output is brought into operation

Pulse Per Second Output (PPS)

The PPS output refers to a precise pulse output each second and which is aligned to the start of each second. A hardware interrupt input for precise timing is provided by the PPS output being fed into a control line on the RS232 interface. Commonly the DCD RS232 line is adopted as a PPS input from the GPS receiver. In jointly utilising NMEA time and positioning data with the PPS output the result is an extremely precise time reference for computers and computer networks.

 

 

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GPS Network Time Server (Manual)

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GPS Network Time Server (Manual)

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