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AR51-07 Low Profile, MIL-Spec, GPS Disciplined, Time and Frequency Unit

AR51-07 Image

AccuBeat’s AR51-07 unit is a low profile GPS Disciplined Rubidium Clock which offers excellent stability and accuracy. The unit includes a Rubidium Atomic Standard which is phase-locked to the GPS or to other external inputs. All outputs are then derived from the Rubidium Atomic Standard and maintain highly accurate time and frequency even when GPS reception is interrupted. When disciplined to GPS the unit provides time accuracy of < 20ns RMS and frequency accuracy better than 2E-12.

The AR51-07 includes Have Quick (ICD-GPS-060) input and output which is essential for secure radio communication applications. The unit can be controlled remotely via MIL-STD-1553RT channel making it suitable for airborne applications as well.  AR51-07 includes an internal C/A code GPS receiver and has the option to install a P(Y) code SAASM GPS receiver instead (needs to be supplied by the customer).

AccuBeat’s AR51-07 comes in several different off the shelf versions and can be further customized to meet customer specifications. Please refer to the attached datasheet for the different options available. AR51-07 is available with AccuBeat’s proprietary Anti-Jamming and Anti-Spoofing technology providing additional protection in cases of GPS denial. For further details, please contact us directly.

AR51-07 Data Sheet pdf

AR51-07 Data Sheet

Key Features

▶ GPS disciplined Rubidium clock
▶ Outputs: 10MHz, 1PPS (TTL & RS-422), TOD (Have Quick), 2PPS (opt.)
▶ Input: GPS antenna, 1PPS, TOD (Have Quick)
▶ Frequency Accuracy : 2E-12
▶ 1PPS Accuracy: Typ. 20ns (RMS)
▶ NTP Server. Time Accuracy <300μs (opt)
▶ Holdover (no GPS): Typ. 1µs/24 hours, 5E-11/month
▶ Operating Temperature: -25°C to +65°C (71°C Emergency). -40°C (opt.)
▶ Control and monitoring : RS-232 (input & output), RS-422 (output), MIL-STD-1553 (opt.)
▶ Ephemeris, Almanac & Ionosphere Data
▶ Supply Voltage: 22-32 VDC per MIL-STD-704D
▶ External battery input for power back-up
▶ P(Y) code GPS (SAASM) receiver (Option)
▶ Full MIL-STD qualification for military Airborne Applications
▶ Graphic User Interface (GUI) Software for PC


Telemetry test fields
Field calibration

Contact us to discuss with one of our experts the best off the shelf or fully customized timing solution for your next project.

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