Secure uPNT Fury GPS Disciplined Oscillator (GPSDO) with OCXO/DOCXO Reference

GPS disciplined oscillator module providing 1 PPS, 10 MHz and NMEA outputs with OCXO or DOCXO holdover for GNSS-denied operation.

OEM PCB: 100 mm x 100 mm x 25 mm
Desktop Enclosure: 140 mm x 170 mm x 58 mm

Datasheet

Overview

The VIAVI Secure uPNT Fury GPSDO is a GPS disciplined oscillator that combines a GPS timing receiver with an OCXO in a single module. It serves as a low phase noise, low Allan deviation frequency and time reference, providing 1 PPS, 10 MHz and NMEA outputs.

A DOCXO (double oven) variant extends holdover capability for operation in GNSS-denied environments or for extended periods without GNSS signals. In holdover mode the unit applies automatic compensation for OCXO aging and temperature coefficient.

Receiver

In 2019 the Fury GNSS receiver was upgraded with the M12M Replacement Receiver, creating the Super Fury GPSDO. It tracks GPS, Glonass, Galileo, BeiDou, SBAS and QZSS (three concurrent constellations) with 72 channels and tracking down to -167 dBm, and adds internal USB configuration and monitoring support along with a reduced time-to-first-fix. Fury firmware revision 1.23 (2020) addresses a holdover issue specific to the Super Fury GNSS module; units with the original Motorola M12M receiver module are not affected.

Control and packaging

The unit is operated from an LCD and keypad or over RS-232 using standard SCPI commands, with settings stored in non-volatile memory. It is compatible with the GPSCon Windows graphing and SNTP server software, and is available as an OEM module or in an aluminum desktop enclosure.

Key Features

Calibration not required
Higher stability than Rubidium clock references
Allan Deviations of less than 1E-011 for measurement intervals greater than 0.1 seconds
Phase noise of <125 dBc at >10 Hz offsets standard
Power consumption of <5 W from 11.0 V to 14 V allows battery operation
Hold-over mode with aging and temperature compensation
Alarm outputs
Control via LCD and keypad or RS-232 using standard SCPI commands
Settings automatically stored in non-volatile memory
Sine-wave and CMOS outputs standard
GPSCon Windows graphing and SNTP server software compatible
Available as OEM module or in an aluminum enclosure
Super Fury receiver tracks GPS/Glonass/Galileo/BeiDou/SBAS and QZSS (3 concurrent constellations), 72 channels
External 1 PPS GPS-FailSafe input with auto-switching

Specifications

Dimensions

OEM PCB OEM Board	100 mm x 100 mm x 25 mm
Desktop Enclosure Desktop	140 mm x 170 mm x 58 mm

1 PPS Output

Connector	BNC (Desktop), Molex 100 mil type connector (OEM PCB)
Output Voltage	3.3 V TTL/CMOS compatible with <2 ns RiseTime 50 Ohm terminated or open ended

10 MHz Sine Wave Output

Connector	BNC (Desktop), Molex 100 mil type connector (OEM PCB)
Output Power	+6 dBm ±3 dBm into 50 Ohms
Stability DOCXO	Better than 5E-013/24 hours when locked to GPS (Double Oven OCXO)
Holdover DOCXO	Better than 7 microseconds/24 hours (better than 8.1E-011/24 hours average) DOCXO
Jitter	380 Femtoseconds RMS measured with Agilent E5052B
Harmonics	<-50 dBc/Hz

Phase Noise (AT-cut OCXO)

1 Hz	-90 dBc/Hz
10 Hz	-122 dBc/Hz
100 Hz	-140 dBc/Hz
1 kHz	-155 dBc/Hz
10 kHz	-155 dBc/Hz
100 kHz	-157 dBc/Hz
1 MHz	-160 dBc/Hz

10 MHz CMOS/TTL Output

Connector	BNC
Output Voltage	3.3 Vpp or 5 Vpp Square Wave Performance similar to 10 MHz Sine Wave Output

1 PPS GPS-FailSafe Input

Description	External 1 PPS input with auto-switching in case internal GPS fails or goes into holdover Allows fail-safe GPS operation, or external (noisy) Atomic backup references
Connector	Molex 100 mil type
Input Voltage	TTL, CMOS 3.3 V/5 V

Timing Accuracy

GPS Locked	Better than ±20 ns UTC offset 1-Sigma (RMS)
Holdover Mode DOCXO	Better than 7 microseconds/24 hours (better than 8.1E-011/24 hours average) DOCXO
Xtal Compensation	Automatic OCXO aging and temperature coefficient measurement and compensation
Allan Deviation	less than 1E-011 for measurement intervals greater than 0.1 seconds

GPS Specification

SAT Signal	12-Channel GPS L1, 1575.42 MHz, C/A 1.023 MHz Timing-Optimized Receiver Web page states the Super Fury receiver upgrade offers 72 channels, GPS/Glonass/Galileo/BeiDou/SBAS and QZSS tracking
Cold Start	Auto Survey mode, or 3D-Fix mode. 15 Minutes warmup to better than 1E-09 DOCXO
Tracking Sensitivity Super Fury	down to -167dBm Super Fury receiver

Status LEDs and Alarm Output

LED Indicators	1 PPS cadence indicator LED. Lock Indicator LED
Alarm Output	3.3 V TTL, can drive LED. System Error, GPS error, and PLL unlock alarm

Serial Interface

Connector	RS-232, 9600 to 115200 Baud
Protocol	SCPI-99 Command Interface. Industry Standard Commands for drop-in replacement

Environmental and Power

Temperature	0-50°C (single OCXO), 0-70°C (double OCXO)
Power	11.0 V to 14.0 V DC less than 4.5 W at 25°C ambient Web page and datasheet highlights state <5 W from 11.0 V to 14 V

Specification Conditions

Conditions	All specifications typical and quoted at 25.0°C after 3 days operation with GPS reception in still air with <1°C change with +12.0 V power supply unless otherwise specified

Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.

Applications

In-house frequency standard
Military and industrial applications
Battery operation
Holdover in GNSS-denied environments
Defense
5G communications
SATCOM
Transportation
Data center
Energy
Financial
Critical infrastructure

Options & Accessories

Option	Description
22174841	Super Fury SOCXO OEM Board - RoHS
22174842	Super Fury DOCXO OEM Board - RoHS
22174843	Super Fury SOCXO Desktop - RoHS
22174844	Super Fury DOCXO Desktop - RoHS