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Trimble BD920-W3G


Dual frequency receiver with integrated communication

Trimble BD920-W3G

The Trimble BD920-W3G module has been designed for applications requiring centimeter accuracy in a compact package. By integrating wireless communications on the same module the task of receiving and transmitting data such as RTK corrections is greatly simplified. The BD920-W3G supports both L1 and L2 frequencies from the GPS and GLONASS constellations plus the E1 frequency from Galileo.

Trimble BD920-W3G

Key Features:

  • 220 Channels for multi-constellation GNSS support
  • Fully EMI shielded module
  • Compact design for mobile applications
  • Integrated Bluetooth™/Wi-Fi
  • Flexible RS232, USB and ethernet interfacing
  • Integrated 3.5G Cellular Modem
  • Centimeter level position accuracy

Trimble BD920-W3G

GNSS and communication tight integration

The Trimble® BD920-W3G module has been designed for applications requiring centimeter accuracy in a compact package. By integrating wireless communications on the same module the task of receiving and transmitting data such as RTK corrections is greatly simplifi ed. A single intuitive web interface allows a variety of use cases to be supported. In addition to GNSS base and rover setups with Wi-Fi or UMTS modem the module also allows simultaneous customer access to the internet. Both GNSS and communication components are fully shielded. This design ensures the high quality signals are protected from the sources of EMI on the host platform. It also signifi cantly reduces radiated emissions which speeds compliance certifi cation and time to market.

Multi constellation GNSS

The Trimble BD920-W3G supports both L1 and L2 frequencies from the GPS and GLONASS constellations plus the E1 frequency from Galileo. This delivers the quickest and most reliable RTK initializations for 1–2 centimeter positioning. For applications that do not require centimeter accuracy the BD920-W3G contains an advanced kalman fi lter PVT engine that delivers high accuracy GNSS, DGNSS or SBAS positions in the most challenging environments such as urban canyons. Diff erent confi gurations of the module are available including single frequency RTK and GPS only. All features are password- upgradeable, allowing functionality to be upgraded as your requirements change. The receiver also supports Fault Detection and Exclusion (FDE) and Receiver. Autonomous Integrity Monitoring (RAIM) for safety-critical applications.

Demonstrated performance

Industry professionals trust Trimble embedded positioning technologies as the core of their precision applications. With the latest Trimble-precise Maxwell™ 6 technology, the BD920-W3G provides assurance of long-term future-proofi ng and trouble-free operation. Moving the industry forward, the Trimble BD920-W3G redefi nes high-performance positioning:

  • On-board multipath mitigation
  • Proven low-elevation tracking technology
  • Dramatically improved RTK Initialization

Flexible Interfacing

The Trimble BD920-W3G was designed for easy integration and rugged dependability. Customers benefi t from the Ethernet connectivity available on the board, allowing high speed data transfer and confi guration via standard web browsers. USB and RS-232 are also supported. Just like other Trimble embedded technologies, easy to use software commands simplify integration and reduce development times.


  • 220 Channels:
    • GPS: L1 C/A, L2E, L2C
    • GLONASS: L1 and L2 C/A
    • Galileo: E12
    • QZSS: L1 C/A, L1 SAIF, L2C
    • SBAS: L1 C/A
  • High precision multiple correlator for GNSS pseudorange measurements
  • Unfiltered, unsmoothed pseudorange measurements data for low noise, low multipath error, low time domain correlation and high dynamic response
  • Very low noise GNSS carrier phase measurements with <1 mm precision in a 1 Hz bandwidth
  • Proven Trimble low elevation tracking technology
  • Up to 20 Hz raw measurement & position outputs
  • Reference outputs/inputs
    • CMR, CMR+, sCMRx, RTCM 2.1, 2.2, 2.3, 3.0, 3.113
  • Navigation outputs
  • 1 Pulse Per Second Output
  • Event Marker Input Support
  • Supports Fault Detection & Exclusion (FDE), Receiver Autonomous Integrity Monitoring (RAIM)


  • 1 USB 2.0 Device port
  • 1 LAN Ethernet port:
    • Supports links to 10BaseT/100BaseT auto-negotiate networks
    • All functions are performed through a single IP address simultaneously—including web GUI access and raw data streaming
    • Network Protocols supported
      • HTTP (web GUI)
      • NTP Server
      • NMEA, GSOF, CMR over TCP/IP or UDP
      • NTripCaster, NTripServer, NTripClient
      • mDNS/uPnP Service discovery
      • Dynamic DNS
      • eMail alerts
      • Network link to Google Earth
      • Support for external modems via PPP
  • 3 x RS232 ports
    • Baud rates up to 115,200
  • Control Software: HTML web browser, Internet Explorer, Firefox, Safari, Opera, Google Chrome
  • Integrated 802.11 a/g/b Wi-Fi wireless technology. Client or access point
  • Integrated 2.4 GHz Bluetooth V3.0 wireless technology12
  • Optional Integrated 3.5G UMTS data module supporting WCDMA and HSDPA


  • Module Part Number : 90775-XX
  • Module : Trimble BD920-W3GGNSS available in a variety
    of configurations from L1 SBAS upwards
  • Evaluation Kit : Includes interface board and power supply


  • Time to First Fix (TTFF)7
    • Cold Start8 : <45 seconds
    • Warm Start9 : <30 seconds
    • Signal Re-acquisition : <2 seconds
  • Velocity Accuracy3 , 4
    • Horizontal : 0.007 m/sec
    • Vertical : 0.020 m/sec
  • Acceleration : 11g
  • Maximum Operating Limits10
    • Velocity : 515 m/sec
    • Altitude 18,000 m


Trimble BD920-W3G
  • RTK initialization time3 : typically <1 minute
  • RTK initialization reliability3 : >99.9%


  • Size : 60 mm x 55 mm x 19 mm
  • Power : 5 V DC 28 V DC
    Typical 1.3 W (L1/L2 GPS + L1/L2 GLONASS)
  • Weight : 54 grams
  • Connectors
    • I/O : 44 -pin header
    • GNSS Antenna : MMCX receptacle
    • Wi-Fi/Bluetooth antenna : MMCX receptacle
    • UMTS antenna : MMCX receptacle
  • Antenna LNA Power Input
    • Input voltage : 3.3 V DC to 5 V DC
    • Maximum current : 400 mA
  • Minimum required LNA Gain : 28.5 dB


  • Temperature
    • Operating : –40 °C to +85 °C
    • Storage : –55 °C to +85 °C
  • Vibration : MIL810F, tailored
    Random 6.2 gRMS operating
    Random 8 gRMS survival
  • Mechanical shock : MIL810D
    ±40 g operating
    ±75 g survival
  • Operating Humidity : 5% to 95% R.H. non-condensing, at +60 °C

1Trimble BD920-W3G is available in a variety of software configurations. Specifications shown reflect full capibility.
2Developed under a License of the European Union and the European Space Agency
3May be affected by atmospheric conditions, signal multipath, and satellite geometry. Initialization reliability is continuously monitored to ensure highest quality
41 sigma level, when using Trimble Zephyr 2 antennas.
5At maximum output rate
6GPS only and depends on SBAS System performance. FAA WAAS accuracy specifications are <5 m 3DRMS
7Typical observed values.
8No previous satellite (ephemerides / almanac) or position (approximate position or time) information
9Ephemerides and last used position known
10As required by the U.S. Department of Commerce to comply with export licensing restrictions
11Dependent on appropriate mounting/enclosure design.
12Bluetooth type approvals are country specific
13Input only network correction

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