GPS/GNSS Modules

Timing Multi-GNSS Receiver Module Model GT-100/GT-9001/GT-90 NEW


The world's highest stability, less than 4.5 ns (1sigma) and lowest degradation of stability in harsh urban environments.

- Unrivalled performance for 5G RAN, Radio Systems, Time servers
- Dual band, supporting all constellations (GT-100)
- Highly precise time & ultra-low jitter 1pps synchronized with UTC
- High Robustness - guaranteed performance even if only L1 or only L5 are used
- Programmable frequency clock outputs synchronized with UTC (GT-9001 & GT-100)
- Excellent performance even in harsh environments

Documents, Software



  • The GT-100, GT-9001 and GT-90 are a new generation of GNSS receiver modules for time synchronization that enable GNSS reception worldwide.
    GT-100 is full-featured highly robust model, supporting dual-frequency band reception (L1 and L5).
    GT-9001 supports L1 and delivers high stability 1PPS and programmable clocks on three channels.
    GT-90 supports L1 and provides a 1 PPS high stability output.
    All models feature the world's best-in-class time stability of less than 4.5 ns (1 sigma) and are equipped with Dynamic Satellite Selection™ (DSS). DSS is the leading multipath-resistant algorithm developed by NTT that minimizes degradation of time performance even when the antenna is installed in urban areas or near a window.
  • A lineup of three models offering a variety of input and output options for all timing requirements

    Model Frequency band Output Short term
    External clock input
    1PPS Clock
    GT-100 L1 / L5
    GT-9001 L1
    GT-90 L1
  • Delivers clock outputs and 1PPS synchronized with UTC time

    The GT-100/GT-9001/GT-90 delivers accurate 1PPS synchronized with UTC with high resolution.
    The GT-100/GT-9001 also includes three output clock signals.The three outputs can be arbitrarily assigned to 1PPS and clock.
    The GT-100/GT-9001 clock outputs can be set as required to 10MHz, 2.048 MHz, 19.2 MHz, and 30.72 MHz, which are commonly used in wireless communications.
    This shortens the time-to-market and contributes to strengthening the customer's competitiveness.
  • The world's highest level of stability of less than 4.5ns (1sigma) under open sky.

  • Compliant with G.8272 PRTC-A and PRTC-B

    Compliant with TDEV (Time Deviation) /MTIE (Max Time Interval Error).
    Exceeds the most stringent requirements in 5G networks.

  • Choice of single or dual band for worldwide GNSS support

    Multi constellation capability supporting GPS, GLONASS, Galileo, Beidou, QZSS and SBAS from various countries.
    The dual-frequency band GT-100 can also receive India's NavIC (L5) signals.
    The GT-100/GT-9001/GT-90 can be used with a selection of positioning satellites or all of them concurrently, making it ideal for globally deployed 5G mobile base stations and network equipment.
  • High robustness with dual-frequency band reception of L1 and L5 (GT-100)

    Dual-frequency band positioning mitigates the effects of ionospheric delays caused by solar flares, etc.
    Time stability of less than 4.5ns (1σ) is achieved even when receiving only L1 or L5.

    (White Paper)Dual Band GNSS Receivers: Safeguarding Critical Infrastructure
  • World's lowest accuracy degradation in harsh urban multipath environments

    The use of GNSS receivers for time synchronization is growing vastly into urban areas where multipath signals are mixed and cause severe degradation of timing accuracy. Our proprietary "Dynamic Satellite Selection™*" technology, which appropriately chooses only the high quality satellite signals, minimizes degradation of time synchronization performance in poor reception environments.
    This technology can be used safely even at base stations installed in urban areas.

    * Multipath resistance technology based on an algorithm developed by NTT

  • Protecting GNSS Reception (Anti-Jamming, Anti-Spoofing)

    The GT-100/GT-9001/GT-90 mitigate the effects of jamming signals automatically and to provide real-time notification to the user of the jamming signal frequency and signal strength.
    The modules enhance receiver security and identify the source of jamming during the operational phase of a customer's system.
    The GT-100/GT-9001/GT-90 also implement a detailed algorithm to verify the correctness of GNSS signals and can detect and eliminate spurious signals that are not broadcast from the satellites.

    The GT-100, which supports dual-frequency band reception, also has the ability to operate only on L5 if L1 is jammed, or only on L1 if L5 is jammed.
  • Short term holdover (GT-100/GT-9001)

    Interruption of GNSS satellite signals is a major concern during operation of critical infrastructure systems.
    GT-100 & GT-9001 support short term holdover, which maintains constant performance even if GNSS satellite signals are interrupted for a short period of time.
  • External clock input (GT-100/GT-9001)

    GT-100 & GT-9001 accept an external time reference input (1PPS, clock) that is different from that of the GNSS satellites. The input can be derived from an external clock, enabling the modules to continue to provide service even in the unlikely event of loss of signal from the GNSS satellites.
  • Carrier Grade Quality. Suitable for critical infrastructure applications

    Compared to conventional GNSS receivers for time synchronization, Furuno's new GNSS receivers are substantially more robust (i.e., they are not affected by most disruptions and thus ensure continuous service).
    Such enhanced features give users a high level of confidence in fields that require high reliability, such as 5G mobile base stations, financial transactions, and power grids.

    White Paper: Countermeasure for GNSS receiver failure
  • Sophisticated built-in security

    Including secure boot and secure firmware update ensures maximum protection against tampering.
  • Enhance performance in combination with recommended antenna

    AU-500/300 Multi-GNSS Timing Antennas deliver both high stability and high robustness.



GNSS Reception Capability
GPS L5, Galileo E5a, BeiDou B2a, QZSS L5, NavIC L5

GNSS Reception
62 channels

32 channels
Acquisition: >= -148 dBm
Tracking: >= -163 dBm

*Measurement environment using GNSS simulator
ITU-T Recommendation
Compliant with G.8272 PRTC-A and PRTC-B

*Compliant with TDEV (Time Deviation) /MTIE (Max Time Interval Error)
1PPS Stability
< 4.5 ns (1σ)

*Open sky
1PPS Accuracy
< ± 40 ns (vs UTC)

*Open sky
1PPS Resolution
< ± 0.2 ns
Clock Output
[GT-100 and GT-9001 only]
1 MHz to 40 MHz
Stability : < 0.5 ppb (1σ)
Short Term Stability (Root Allan variance ( =1s)) : < 5 × 10-10
Long Term Stability (24h average) : < ± 1 × 10-12
TTFF (Typical)
Hot Start: 2 sec(Typ)
Cold Start: 35 sec(Typ)

*Measurement platform with recommended active antenna
Supply Voltage
3.3 VDC
Power Consumption
55 mA
*Tracking Satellite outdoor
Operating Temperature
-40°C to +85°C
47Pin LCC(Leadless Chip Carrier)
18.0mm × 17.8mm × 3.11mm
PFEC (NMEA 0183 Standard Ver 4.11)
Secure boot, Secure FW update
[GT-100, GT-9001 and GT-90]
UART, GPIO, Time pulse (1PPS)

[GT-100 and GT-9001 only]
Clock, External clock input
[GT-100, GT-9001 and GT-90]
Anti-Jamming (8CW), Multipath Mitigation (Dynamic Satellite Selection™), Anti-Spoofing, T-RAIM, Antenna Detection Circuit.

[GT-100 and GT-9001 only]

White Papers

- Dual Band GNSS Receivers: Safeguarding Critical Infrastructure

What are the advantages of a dual-band frequency receiver in time synchronization applications where service outages are not tolerated?

Our engineer specializing in time synchronization explains the following in over 20 pages.
"Why is now the right time to move to dual-band?"
"Robustness by dual-band receiver"
"Outstanding features of GT-100"

Download form


- Countermeasure for GNSS receiver failure

Our engineer specializing in time synchronization explains, with charts and diagrams, the countermeasures to be taken on the receiver side against typical GNSS-related problems such as “multipath, "jamming", "spoofing", and interruption of GNSS signal reception, the degree of effectiveness, and how to select a GNSS product.

If this is your first time considering a GNSS receiver, please have a look through these papers.

You can download all five together with the white paper “High Stability of 4.5ns (1 sigma) using a single band GNSS timing receiver”.

Download form

Documents, Software

Download documents and software related to this product and other GPS/GNSS products (Specifications document, Drivers and Monitor software).

Download contents for GT-100/9001/90

  • Hardware Specifications (draft version)
  • Protocol Specifications (draft version)
  • White Paper (Countermeasure for GNSS receiver failure)
  • Monitoring Software
  • Article (Basics of Network Time Synchronization)
  • Article (Supporting nanosecond-precise infrastructure with GNSS technology cultivated from marine business)

Download page


FURUNO defines as the following.

1PPS Accuracy and 1PPS Stability
1PPS Accuracy: Measure of how far away from the true value (UTC: Coordinated Universal Time)
1PPS Stability: Measure of the variation in accuracy over a period of time

*Please note that some literature confuses stability with accuracy.


Robustness and Resiliency
Robustness: Enables continuous service without being affected by undesirable attacks on GNSS reception.
Resiliency: Defines the capacity of the device to recover and restore quickly from interruptions that may occur.

Evaluation Kit

Evaluation kit for GT-100/9001/90.
The Evaluation Kit can supply power and communicate with USB interface.

  • 5VDC Power supply through USB bus power
  • Serial communication through USB
  • 1PPS/Clock output from the SMA connectors
  • SMA antenna connection
  • Outer size is (w) 86mm x (D) 51mm x (H) 21mm
  • Weight is about 65g
  • Accessories are USB cable, Multi-GNSS Antenna and CD ROM containing the Communication Software and the documentations


* Specifications subject to change without notice.