GNSS Time & Frequency Standards with NTP

The GNSS Time & Frequency Standard series of instruments are precision time & frequency standards that use time signals from Global Navigation Satellite Systems (GNSS) as a reference, plus an alternative IRIG-B timecode input, to provide a suite of reliable output and interface options.

Key Features (All Models)

  • Choice of GNSS synchronisation source (GPS, Glonass or  Beidou)
  • Backup synchronisation source from IRIG-B Timecode
  • Oven Controlled Crystal Oscillator for high frequency stability
  • Dual Redundant Power Supply
  • 1 x NTP/SNMP network interface
  • 2U high 19” rack-mountable chassis

GNSS Synchronisation

The unit includes an integral GNSS receiver (choice of GPS, GPS/Glonass or GPS/Beidou) and automatically synchronises to the GNSS signal if at least one satellite is in view. When synchronised to GNSS, the GNSS functions as a STRATUM 1 time reference, and has an accuracy of better than 100 nanoseconds to GNSS Time. The unit is also capable of providing precise position in the event that at least four satellites are in view. The GNSS signal disciplines the internal oscillator to ensure continued operation during periods where the GNSS signal is unavailable.

IRIG-B Synchronisation

The instrument may alternatively be synchronised to an IRIG-B timecode input, with a choice of either modulated or DC Level Shift. Accuracy is to better than 100 nanoseconds (DCLS) or 5 microseconds (modulated). The IRIG-B signal disciplines the internal oscillator ensuring continued operation in case of interruption to the signal input.

Front Panel & Internal Power

The unit is programmable via its front panel alphanumeric keypad. Status and position information is displayed on the front panel LCD. Dual internal power supplies operate redundantly, and in the event of a total power failure the programmed information is maintained.

GNSS-FO Time & Frequency Standard

This model benefits from IRIG-B fibre optic outputs in addition to the standard hardwired outputs:

  • 6 x IRIG-B outputs (hardwire)
  • 7 x IRIG-B outputs (fibre optic)
  • 1 x 1PPS output
  • 1 x pulse output (customer defined)

GNSS-HQ Time & Frequency Standard

This model benefits from HaveQuick outputs for secure communication applications (e.g. military) with the additional flexibility to include 4 frequency outputs instead of some of the IRIG-B outputs:

  • • 2 x HaveQuick outputs
  • • 6 x IRIG-B outputs (hardwire) or
  • 2 x IRIG-B outputs (hardwire) plus 4 x frequency outputs
  • • 1 x 1PPS output

GNSS-F Time & Frequency Standard

This model offers the option to include 4 frequency outputs as in the GNSS-HQ model, but without the additional cost of including HaveQuick outputs.

  • 6 x IRIG-B outputs (hardwire) or
  • 2 x IRIG-B outputs (hardwire) plus 4 x frequency outputs (1MHz, 5MHz or 10MHz)
  • 1 x 1PPS output
  • 1 x pulse output (customer defined)

GNSS-E Time & Frequency Standard

This model has the simplest suite of outputs and consequently is a great economic option

  • 6 x IRIG-B outputs (hardwire)
  • 1 x 1PPS output
  • 1 x pulse output (customer defined)