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Unicore UM981 GNSS RTK/INS Module


GPS/GLONASS/Galileo/BeiDou All-constellation Multi-frequency RTK/INS Integrated Positioning Module



The UM981 is Unicore’s new-generation proprietary high-precision positioning, based on the Nebulas IVTM SoC. The UM981 simultaneously tracks multiple frequencies of all GNSS systems, enabling the module to output high-precision RTK positioning.

Driven by a full-constellation, full frequency RTK engine, an RTK algorithm taking advantage of triple and quad-frequency observables, the UM981 effectively mitigates ionosphere residuals, delivering a fast time to first fix.

With built-in advanced anti-interference technology, the UM981 ensures delivery of reliable and accurate positioning data, even in complex electromagnetic environments.

Featuring extraordinary positioning performance and stability, UM981 is a perfect choice for high precision surveying and positioning applications.


  • Latest generation GNSS SoC – Nebulas IVTM, with integrated RF, baseband, and high precision processing algorithm’s
  • Small 17 x 22 x 2.6 mm surface-mount package
  • All-system multi-frequency RTK engine with advanced “Instantaneous RTK Initialization Technology”
  • Low power-consumption of ~480mW
  • Supports GPS L1/L2/L5, GLONASS L1/L2/L3, Galileo E1/E5a/E5b, BeiDou B1I/B2I/B3I/B1C/B2a/B2b, QZSS L1/L2/L5, SBAS
  • On-board MEMS sensor for accurate tilt measurement of up to 30° for use in the surveying industry
  • “RTK KEEP” technology for extended precision positioning after loss of base-station corrections


  • Intelligent Driving
  • Surveying and Mapping
  • Precision Agriculture
  • Robotics

Technical Specifications

Channels: 1408 channels, based on NebulasIVTM
GPS: L1C/A, L2P (Y), L2C, L5
Galileo: E1, E5a, E5b
BeiDou: B1I, B2I, B3I,B1C,B2a,B2b
QZSS: L1, L2, L5
Single Point Positioning (RMS): Horizontal: 1.5m
Vertical: 2.5m
Velocity Accuracy (RMS): 0.03 m/s
Time Accuracy (RMS): 20 ns
DGPS (RMS): Horizontal: 0.4m
Vertical: 0.8m
Cold Start: <30 s
RTK (RMS): Horizontal: 0.8cm + 1ppm
Vertical: 1.5cm + 1ppm
Initialization Time: <5 s (typical)
Initialization Reliability: >99.9%
Dimensions: 17.0 mm x 22.0 mm x 2.6 mm
Weight: 1.88 g
I/O Connectors: 54 pin LGA
Operating Temperature: -40°C – +85°C
Storage Temperature: -55°C – +95°C
Humidity: 95% non-condensing
Vibration: GJB150.16A-2009, MIL-STD-810F
Shock: GJB150.18A-2009, MIL-STD-810F
Voltage: 3.0~3.6VDC
Power Consumption: 480mW (typical)


The UM981 high-precision GNSS RTK/INS module 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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