Using NMEA as a GPS Timing Reference

Products

TimeTools SR and SC range of stratum 1 network time servers provides a highly accurate and reliable solution to any network time sync requirement.

SR Series Rack-
Mountable NTP Servers

SC Series Compact NTP
Servers

Radio and GPS time synchronisation systems for PC's provide cost-effective solution to PC time synchronisation.

GPS Time Server

MLS Radio PC Time
Server

MPS Radio PC Time
Server

T1000 GPS Time
Server

T2000 GPS Time
Server

TimeTools Ethernet NTP digital wall clocks provide accurate synchronised time display solution.

Ethernet NTP Digital
Wall Clock

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

Support - MSF \ DCF-77 Radio Time Code Timing

Support - NTP - Network Time Protocol

Support - NTP s5000 Series NTP Time Servers

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

Support - Windows XP / Server 2003

Using NTP \ SNTP Software with Windows XP / 2003 Firewall

Support - Revision

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