GPS/GNSS Modules

Timing Multi-GNSS Receiver Module Model GT-87NEW

For Timing

High sensitivity and high accuracy timing Multi-GNSS Receiver Module

The GT-87 is the high-sensitivity, high-accuracy Timing Multi-GNSS receiver.
The GT-87 supports TRAIM and various position modes, allowing it to output accurate and robust 1PPS synchronized to UTC time.
The GT-87 supports GPS, GLONASS, QZSS, SBAS, Active Anti-Jamming and Advanced Multipath Mitigation Functions.


  • Multi-GNSS, Concurrent reception of GPS and GLONASS

    ・Improved of robustness thanks to concurrent reception of GPS and GLONASS signals
    ・Supports concurrent GPS, GLONASS, SBAS and QZSS. Galileo Ready
  • Simultaneous output of time pulse (1PPS) and low jitter clock (configurable, e.g. 10MHz) synchronized with the 1PPS

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

    ・1PPS accuracy: < 15 nsec (1σ) (@-130 dBm)
  • Suitable for system synchronization with low jitter clock in addition to high accuracy time pulse

    ・Configurable clock output(e.g. 10MHz), coherent with time pulse (1PPS)
  • One satellite tracking is enough to output precise 1PPS (Position Hold Mode)

  • Selectable Position Mode based on use case

    ・Position Hold Mode
    ・Position Survey Mode
  • TRAIM function detects low-integrity satellite and satellite not to use for positioning

    ・Suitable for infrastructure development which needs high integrity.
  • Improved Noise Tolerance

    Reduces effects of internal and external noise
    Active Anti-Jamming
    Advanced Multipath Mitigation
  • Embedded Flash ROM

    Suitable for long-term use backed by FURUNO’s continuous support and function enhancement



GNSS Reception CapabilityGPS L1 C/A, GLONASS L1OF, QZSS L1 C/A, SBAS L1 C/A
(Ready): Galileo E1B/E1C, QZSS L1S
GNSS Reception26 channels (GPS, GLONASS, QZSS, SBAS)
Update Rate1Hz
Tracking: -161 dBm
Hot Start: -161 dBm
Warm Start: -147 dBm
Cold Start: -147 dBm
Reacquisition: -161 dBm

Tracking: -157 dBm
Hot Start: -157 dBm
Warm Start: -143 dBm
Cold Start: -143 dBm
Reacquisition: -157 dBm

*Measurement platform with recommended active antenna
Position Accuracy (Horizontal)GPS:2.5m(CEP)

*Measurement platform with recommended active antenna
1PPS Timing Accuracy15ns(1σ) (@-130 dBm)
50ns(1σ) (@-150 dBm)
Clock Configurable Range4 KHz to 40 MHz
TTFF (Typical)Hot Start: <5 sec (@-130 dBm)
Warm Start: 35 sec (@-130 dBm)
Cold Start: 40 sec (@-130 dBm)

*Measurement platform with recommended active antenna
Supply Voltage3.3VDC
Power ConsumptionAcquisition Mode: 72 mA
Backup Supply1.4 to 3.6VDC / 10 μA (Typ)
Operating Temperature-40°C to +85°C
Storage Temperature-40°C to +85°C
Package24Pin LCC (Leadless Chip Carrier)
ProtocoleSIP (NMEA 0183 Standard Ver 4.10)
M12 Binary
InterfacesUART, I2C, Time Pulse (1PPS), Clock
Multipath MitigationAvailable


Evaluation Kit

GN-87F Evaluation KitGT-87 Evaluation Kit is available to evaluate the performance of GT-87.
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, GPS-GLONASS Antenna and CD ROM containing the Communication Software, the USB driver and the documentations



Locate a Distributor Contact a local distributor for further details.

* Specifications subject to change without notice.

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