GNSS for Time Sync

Multi-GNSS Disciplined Oscillator

Model GF-8703

Old Products

OCXO equipped High sensitivity Multi-GNSS Disciplined Oscillator which achieves the world's best-in-class small size and low price.

GF-8703 outputs 1PPS synchronized with UTC as well as 10MHz coherent to 1PPS.
GF-8703 can receive concurrent GPS, GLONASS, QZSS (Quasi-Zenith Satellite System) and SBAS signals.

New Product:GF-8805 (Extremely high stability of 4.5ns (1sigma) using a single band receiver)

GNSS (Timing, Automotive/Industrial)

Downloads

Features
Specifications
Evaluation Kit
Downloads
Contact

Features

Generates UTC-synchronized 1PPS (pulse per second) and continuously disciplined 10 MHz

Reduces errors in digital communication by providing highly accurate and stable frequency

Coherent behavior between time pulse (jitter less 1PPS) and frequency (10 MHz)

Built-in high-sensitivity timing Multi-GNSS receiver with improved noise tolerance for harsh environments

Receives concurrent GPS, GLONASS, QZSS (Quasi-Zenith Satellite System) and SBAS signals
Flexible antenna installation locations thanks to high sensitivity and twice the number of satellites in view as opposed to GPS-only positioning
Reduces effects of internal and external noise thanks to Active Anti-Jamming and Advanced Multipath Mitigation

Supports Holdover function with the world's smallest size

Even if GNSS falls into unlock, the FURUNO GNSSDO will predict oscillator behavior and automatically make corrections thanks to FURUNO's Advanced Oscillator Control Function
Continuously outputs highly accurate and stable 1PPS and frequency
Expands GNSSDO applications for many devices which in the past could not use GNSSDO thanks to miniaturized size and reasonable price

Support compatible design depending on customer's requirement

Supports the same output format as well as pin-compatible design (GF-8701, GF-8702, GF-8703)

GNSSDO can be customized to meet unique customer requirements

[Specification]

Product Name	Timing Specifications (1PPS)		Frequency Specifications (10MHz)	Size (mm)
Product Name	Normal Status	Holdover	Normal Status (24h avg.)	Size (mm)
GF-8701	< ±100ns	-	< ±1×10^-11	34×27×11
GF-8702	< ±100ns	< ±50μs/24H	< ±1×10^-12	34×27×15.5
GF-8703	< ±100ns	< ±10μs/24H	< ±1×10^-12	34×27×20
GF-8704	< ±50ns	< ±5μs/24H	< ±1×10^-12	100×52×20
GF-8705	< ±50ns	< ±1.5μs/24H	< ±1×10^-12	100×52×20

[Test data]
1PPS Timing Accuracy <± X μs continued from start of holdover.

Reference information only, values not guaranteed.

Product Name	1PPS timing accuracy
Product Name	< ±0.1μs	< ±0.4μs	< ±1.1μs	< ±1.5μs	< ±5μs	< ±10μs
GF-8702	-	-	1H	2H	8H	16H
GF-8703	-	1H	3H	4H	16H	-
GF-8704	-	2H	6H	8H	-	-
GF-8705	2H	6H	18H	-	-	-

Time Synchronization

Selectable sources for time synchronization from UTC time or GPS time

Single satellite tracking capable operations (except Navigation Mode)

Antenna Connection Status Check Function

Checks the antenna connection status (Open or Short)

Assesses antenna connection failure or malfunction easily

Antenna Power Supply Function

Provides power from GNSSDO directly to antenna

Enabling a simplified antenna connection

Backup Power Supply

Significantly reduces recovery time to GNSS lock after rebooting or interruption

Detect/Disable low integrity satellites (TRAIM function)

Synchronization with external pulse

Enables synchronizing to time pulse from an external source

Usable to synchronize to time information such as IEEE1588 or SyncE obtained through the network
Improves robustness of the system

Arbitrary frequency output

Enables arbitrary frequency output separately from reference frequency

Wide operation temperature range

-40°C to +85°C

ITU-T G.8272/Y.1367 compliant

Suitable for Grandmaster clock

Suitable for various communication and broadcasting applications

For infrastructure requiring product reliability

Small cell applications including LTE (TDD/ MBSFN/ CoMP/ eICIC)
Multimedia broadcast base stations or wireless base stations
Smart grids

Enhance performance in combination with recommended antenna

Multi-GNSS antenna AU-217 receives GPS signal (L1 band) and GLONASS signal (G1 band), and has highly noise resistant as well as highly environmental resistant equivalent to IP67. Multi-GNSS antenna AU-217 is suitable for use with Furuno timing Multi-GNSS modules and disciplined oscillators.

Here's more on Multi-GNSS antenna AU-217

Specifications

General

GNSS Reception Capability

GPS L1 C/A, GLONASS L1OF, QZSS L1 C/A, SBAS L1 C/A

GNSS Reception

26 channels (GPS, GLONASS, QZSS, SBAS)

Sensitivity

GPS
Tracking: -161 dBm
Acquisition: -147 dBm

GLONASS
Tracking: -157 dBm
Acquisition: -143 dBm

*Measurement platform with recommended active antenna

Initial Stabilization Time

< 5 minutes (untill lock state)

10 MHz Output

Square pulse

10MHz Output (Lock State)

Frequency Accuracy (24h avg.): <±1×10⁻¹²
Short Term Stability: <2×10⁻¹⁰

1PPS Output (Lock State)

1PPS Accuracy: <±100ns
1PPS Stability: 15ns (1σ)

10MHz Output (Holdover)

Frequency Accuracy (24h): <±1×10⁻⁹
Short Term Stability: <2×10⁻¹⁰

1PPS Output (Holdover)

1PPS Accuracy: <±10μs/24h

Supply Voltage

3.7VDC

Current Consumption

600 mA (Typ) (3.7 V, Stable State)

Backup Supply

1.4 to 3.6VDC / 0.4 μA (Normal Operation)

Operating Temperature

-40°C to +85°C

Antenna Detection

Short and Open Detection

Outer Size

34mm x 27mm x 20mm

Protocol

eSIP (NMEA 0183 Standard Ver 4.10)

Anti-Jamming

Available

Multipath Mitigation

Available

Functions

External Referense Synchronisation, Output Status Signal

Evaluation Kit

P/N VF-03 : Evaluation kit for GF-8703

Connect the PC with a USB port to communicate. Output time pulse (1PPS) and 10 MHz reference frequency (selectable) from a SMA terminal.

Contents: GNSS antenna, CD (GNSS Conductor GF), USB cable

Evaluation kit configuration (video)

simple use by connecting the GNSS antenna with the power supply.

Downloads

Name	Last update
Hardware Specifications	Aug 31, 2018
Protocol Specifications	Aug 1, 2018
User's Guide	Mar 8, 2017
Operation Manual for Evaluation Kit	May 24, 2019

Name	Remarks
FURUNO GNSS Conductor GF for Windows®	【System requirements】 OS Windows® 7(32bit, 64bit) / 8.1(64bit) / 10(64bit) Display resolution 1024x768 or higher User's Guide
FURUNO GNSS Conductor GF for Windows® USB Serial Driver	【What is this?】 This is a driver to perform serial communication between Windows® PC and USB device. 【System requirements】 OS Windows® 7(32bit, 64bit) / 8.1(64bit) / 10(64bit) 【How to install?】 Unzip “GnssConductorGF_Windows_UsbSerialDriver.zip” and conduct “dpinst_x64.exe” for 64-bit PC and “dpinst.exe” for 32-bit PC respectively.

Name	Remarks
[Article] Expanding PTP Applications from 5G Networks to the Manufacturing and Electric Power Industries. Supporting Industrial and Societal DX Through Time Synchronization(English)	Download Form
[Article] Strengthening Critical Global Infrastructure: Ushering in an Era of Dual Band GNSS Signal Reception for Time Synchronization(English)
[Article] A basic explanation of how NTP/PTP works! Basics of Network Time Synchronization(English)	Download Form
[Article] Supporting nanosecond-precise infrastructure with GNSS technology cultivated from marine business(English)
GPS Week Number Rollover of FURUNO GPS/GNSS receivers(English)