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Tel: +44 (0) 1902 897400
Fax: +44 (0) 870 123 1844 Email: Info@TimeTools.co.uk |
Using NMEA as a GPS Timing Reference
Many GPS devices use the NMEA protocol, which has been adopted as a standard protocol for GPS devices. The NMEA protocol is ideal for providing continuous positioning information along with a timestamp indicating when information was generated. However, often NMEA timing sentences are not generated at times consistent with the supplied timestamp. This basically means that it is difficult to obtain an accurate consistent time from an NMEA GPS device. Many NMEA GPS devices therefore only provide an accuracy of about +/- 1 second, which is just not accurate enough for network timing purposes. Many GPS devices also provide a pulse per second (PPS) output to provide an accurate timing reference. However, the NMEA GPS timing sentence is not synchronised to the pulse output providing poor accuracy. The pulse output is provided at a TTL (5V) signal level rather than a RS232 level that can be recognized by PC equipment. This makes it hard to integrate the GPS device with a computer system. TimeTools T1000 and T2000 GPS Clock devices utilise an accurate GPS timing receiver with a binary protocol synchronised with a highly accurate timing pulse. This allows for a much more stable and highly accurate timing solution to be implemented. |
Support - GPS Timing
- What is the coverage of the GPS signal ?
- Where is the best place to locate the GPS antenna ?
- That are the advantages of the GPS timing solutions ?
- What is the maximum cable length of the GPS antenna ?
- GPS signal issues.
- What is Galileo ?
- NTP Time Server GPS Amplifier
- Windows 2000 GPS Clock
- Windows XP GPS Clock
- Windows 2003 GPS Clock
- Linux GPS Clock
- NMEA GPS Clock
- Sharing a single GPS antenna with multiple GPS NTP Server
Support - MSF \ DCF-77 Radio Time Code Timing
- MSF Timing Advantages.
- DCF-77 Timing Advantages.
- What is the coverage of the MSF signal ?
- What is the coverage of the DCF-77 signal ?
- Where is the best place to locate a MSF radio antenna ?
- Where is the best place to locate a DCF-77 radio antenna ?
- What is the maximum cable length of the MSF radio antenna ?
- What is the maximum cable length of the DCF-77 radio antenna ?
- MSF Radio Signal Issues.
- MSF Signal Outages
- NTP Time Server MSF Accuracy
- NTP Time Server DCF77 Accuracy
- NTP Time Server GPS Accuracy
- NTP Time Server - Is the MSF Signal Affected By Weather
Support - NTP - Network Time Protocol
- NTP Authentication Example
- Linux NTP Client Configuration
- Windows 2000 NTP Time Server
- Windows 2003 NTP Time Server
- Windows XP NTP Time Server
- NTP Time Server Accuracy
- NTP and SNTP
- Using NTP \ SNTP Software with Windows XP / 2003 Firewall
Support - NTP s5000 Series NTP Time Servers
- What is the maximum NTP s5000 NTP requests per second ?
- What are SysLog messages ?
- Dual NTP Time Server
- NTP Time Server BTU
Support - MSF Radio FAQ
Support - Atomic Clock FAQ
- MSF Atomic Clock information
- DCF Atomic Clock information
- GPS Atomic Clock information
- Atomic Clock UTC Time
- TimeTools Atomic Clock Synchronisation Devices
Support - Digital Wall Clock
- How do the Ethernet Digital Wall Clocks display accurate time ?
- How are the Digital Wall Clocks configured ?
- How is PoE used on the Digital Wall Clocks ?
- Digital Wall Clock Mounting options.
- Digital wall clock display formats.
- Digital Wall clock time zones
- Daylight saving
Support - Windows XP / Server 2003
Support - Revision
- Index
- NTP s5000 Firmware Revisions
- NTP s5100 Firmware Revisions
- NTP s5500 Firmware Revisions
- TrustTime NT/2000/XP
- TrustTime NTP
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Ethernet Networked NTP Time Displays |
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