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Unicore UB4B0M Compact GNSS RTK Board

GPS/GLONASS/Galileo/BeiDou Multi-system Multi-frequency Compact High Precision GNSS RTK Board



The Unicore UB4B0M GNSS RTK board is a compact high precision board supporting RTK positioning. Using the multi-system, multi-frequency and high-performance GNSS SoC Nebulas-IITM, the board features low-power consumption design and offers millimeter-level carrier phase observation value as well as centimeter-level RTK positioning, supporting chip-level multi-path mitigation. The RTK technology is especially suitable for high-precision navigation and positioning applications.

The new generation of Nebulas-II is a multi-system multi-core high-precision GNSS SoC, supporting 432 super channels, with built-in broadband ADC and anti-interference. It also integrates two 600 MHz ARM processors and dedicated high-speed floating-point operation processor to provide more powerful satellite navigation signal processing capabilities.

The UB4B0M tracks signals from GPS, GLONASS, Galileo, BeiDou and QZSS simultaneously, supporting tri-band signals from GPS, Galileo and BeiDou. With more satellite navigation system signals and reliable tri-band RTK technology, the UB4B0M enables near “instantaneous” RTK initialization and achieves 1-2 cm positioning accuracy. Even under shade or from a long distance, the UB4B0M can still obtain RTK positioning results quickly and reliably.

The UB4B0M has excellent adaptive anti-interference performance. Thanks to the powerful Nebulas-II chip and high linearity, wide dynamic RF front-end design, the potential narrowband and single tone radio interference signals in the GPS, GLONASS, Galileo and BeiDou signal bands can be effectively suppressed by the UB4B0M, with an up to 60dB JSR. It obtain accurate positioning results even in complex electromagnetic environments such as vehicles and drones.

The UB4B0M integrates an on-board MEMS chip and an improved U-Fusion integrated navigation algorithm. In complex environments such as buildings, tunnels and viaducts, this technology can effectively solve the problem of interruption and sudden change in positioning results caused by satellite signal shielding, and provide continuous and high-quality positioning results. In addition, the UB4B0M also supports odometer information input to provide better integrated navigation and positioning performance.


  • Based on the multi-system, multi-frequency and high-performance SoC chip Nebulas-IITM
  • Advanced multi-path mitigation
  • Supports 3xUART, 1x1PPS


  • Supports GPS L1/L2 + GLONASS L1/L2 + Galileo E1/E5a/E5b + BeiDou B1/B3 + QZSS L1/L2/L5
  • Better than 1mm carrier phase observation value
  • Centimeter-level high precision RTK positioning
  • Hardware dimensions compatible with mainstream GNSS OEM boards in the market

Technical Specifications

Channels: 432
GPS: L1, L2, L5
Galileo: E1, E5a, E5b
BeiDou: B1, B2, B3
QZSS: L1, L2, L5
SinglePoint Position (RMS): Horizontal – 1.5 m
Vertical – 2.5 m
DGPS (RMS): Horizontal – 0.4 m
Vertical – 0.8 m
RTK (RMS): Horizontal – 1 cm + 1 ppm
Vertical – 1.5 cm + 1 ppm
TimetoFirstFix(TTFF): 25 s
WarmStart: < 10 s
Reacquisition: 1 s
InitializationTime: 5 s(Typical)
DataUpdateRate: 20 Hz
LocationUpdateRate: 20 Hz
TimeAccuracy (RMS): 20ns
VelocityAccuracy (RMS): 0.03m/s
Dimensions: 46 mm x 71 mm x 13 mm
Weight: 26 g
OperatingTemperature: -40 °C – +85 °C
StorageTemperature: -55 °C – +95 °C
Humidity: 95% non-condensing
Vibration: MIL-STD-810
Shock: MIL-STD-810

Evaluation Kit



The UB4B0M high precision GNSS RTK board from Unicore is available through TerrisGPS. Please use the Request Pricing form to contact us for further information.

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Client Testimonials

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"Thank you for your prompt service. All seems to be working well again. Your techs were very helpful with the troubleshooting."
J.O. - Ground Navigation
"Thanks for all the troubleshooting help, also to John for his assistance and the prompt answers from you guys!"
F.A. - Survey Industry

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