GPS/GNSS Modules

Timing Multi-GNSS Receiver Module Model GT-88 NEW

Extremely high stability of 4.5ns (1sigma) using a single band receiver

The GT-88 is the high-stability, high-accuracy timing Multi-GNSS receiver.
It incorporates Dynamic Satellite Selection™, which is a new satellite signal selection algorithm developed by NTT. Thanks to that GT-88 permits GNSS antennas to be mounted more freely than ever before including wall mounting and window mounting installations.



  • Enable to output accurate and robust UTC time and 1PPS synchronized with UTC time

    FURUNO technology made it possible to achieve 5G-required performance. 4.5ns (1 sigma) by a single band receiver is obtained. This is achieved by an improved and advanced position estimation algorithm. It optimizes position calculations using several different GNSS satellite constellations. It allows users to achieve 5G-required performance without changing existing single band GNSS antennas.

    >> White Paper: High Stability of 4.5ns (1 sigma) using a single band GNSS timing receiver
  • GNSS antennas can be mounted on walls and windows of tall buildings

    The Dynamic Satellite Selection™* minimizes deterioration of time synchronization performance by choosing only the high quality satellite signals
    * a new satellite signal selection algorithm developed by NTT

    >> White Paper: Industry-leading multipath mitigation in urban canyon environments

  • Suitable for various RF・Broadcasting applications. Designed functions aiming to solve usual troubles on site.

    The number of radio stations applied with GNSS time synchronization, ex. PMR, local 5G, and V2X, has been increasing year by year. Especially in urban area, users have to face problems such as urban canyon (signals blocked) and multi-path (signals reflected) etc.

    1. Multipath in Urban area
    2. Jamming (interference wave)
    3. Spoofing

    Countermeasure for GNSS receiver failure. (White Paper)

  • In comformity with G.8272 PRTC-A

    *In conformity with TDEV/MTIE
  • Concurrent reception of GPS/GLONASS/Galileo/QZSS/SBAS

  • Suitable for various communication and broadcasting applications

    TRAIM, Single Satellite Tracking, Multipath Mitigation, Anti-Jamming and Anti-Spoofing
  • Configurable frequency output (10 Hz to 40 MHz)

  • Enhance performance in combination with recommended antenna

    Multi-GNSS antenna AU-217 has highly noise resistant as well as highly environmental resistant equivalent to IP67. AU-217 is suitable for use with Furuno timing Multi-GNSS modules and disciplined oscillators.
    Here's more on  Multi-GNSS antenna AU-217



GNSS Reception Capability
GNSS Reception
32 channels
Tracking: > -162 dBm
Acquisition: > -148 dBm

Tracking: > -158 dBm
Acquisition: > -144 dBm

Tracking: > -146 dBm
Acquisition: > -136 dBm

Tracking: > -147 dBm
Acquisition: > -131 dBm

*Measurement platform with recommended active antenna
ITU-T Recommendation
in comformity with G.8272 PRTC-A

*in conformity with TDEV/MTIE
1PPS Stability
< 4.5 ns (1σ)

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

*Open sky
1PPS Resolution
± 1.75 ns
Clock Configurable Range
10 Hz to 40 MHz
TTFF (Typical)
Hot Start: <5 sec
Cold Start: <35 sec

*Measurement platform with recommended active antenna
Supply Voltage
3.3 VDC
Power Consumption
< 68 mA

*85℃ when tracking
Operating Temperature
-40°C to +85°C
24Pin LCC(Leadless Chip Carrier)
12.2mm × 16.0mm × 2.8mm
eSIP (NMEA 0183 Standard Ver 4.10)
UART, Time Pulse (1PPS), Clock
Anti-Jamming (8CW), Multipath Mitigation (Dynamic Satellite Selection™), Anti-Spoofing, T-RAIM

Countermeasure for GNSS receiver failure

We provide technical white papers for each of the typical failures caused by GNSS receiver. For each failures, our experts in time synchronization explain details about countermeasures on receiver side, using diagrams to show the effectiveness, and how to select products. If you are considering a GNSS receiver for the first time, please take a look.

  1. Multipath in Urban area
    White Paper: Industry-leading multipath mitigation in urban canyon environments
  2. Jamming (interference wave)
    White Paper: Measures against GNSS jamming (jamming wave)
  3. Spoofing
    White Paper: Measures against GNSS spoofing signals
  4. Interruption of GNSS signal (holdover)
    White Paper: "Holdover function" as measures against GNSS reception interruptions

The GT-88 doesn't have holdover function. If necessary, please use GF-8802/GF-8803/GF-8804/GF-8805 instead.

Download page

Evaluation Kit

 Evaluation Kit is available to evaluate the performance of GT-88.
The Evaluation Kit can supply power and communicate with USB interface.
  • 5VDC Power supply through USB bus power
  • Serial communication through USB
  • 1PPS output from the SMA connectors
  • SMA antenna connection
  • Outer size is (w) 110mm x (D) 112mm x (H) 30mm
  • Weight is about 260g
  • Accessories are USB cable, Multi-GNSS Antenna and CD ROM containing the Communication Software, the USB driver and the documentations

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-88

  • Hardware Specifications
  • Protocol Specifications
  • White Paper (Countermeasure for GNSS receiver failure)
  • Monitoring Software

Download page


* Specifications subject to change without notice.