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

Unicore's new-generation proprietary RTK/INS integrated navigation module. The module integrates a high-speed floating-point processor and an RTK-dedicated coprocessor, enabling it to output IMU raw data at 100Hz and RTK data at 50Hz, respectively. The on-board MEMS chip and algorithm ensure continuous, high-quality positioning results in GNSS denied environments such as buildings, tunnels, overpasses, and shaded areas. With its high precision and performance, the UM981 is well-suited for surveying and precision agriculture, among other applications.

anti jamming


  • Based on the new generation GNSS SoC -NebulasIV, which integrates RF, baseband and high precision algorithm

  • All-constellation multi-frequency RTK engine and advanced RTK technology

  • Instant RTK initialization technology

  • 60 dB narrowband anti-jamming and jamming detection

  • Heading2 technology to provide orientation information

  • STANDALONE single-station high-precision positioning technology

  • Supports B2b-PPP and E6-HAS

  • On-board MEMS integrated navigation and U-Fusion technology to ensure continuous positioning when loss of lock on GNSS signals occurs

Technical Specifications

Performance Specifications

Channel1408 channels, based on NebulasIV
FrequencyGPS L1C/A, L1C, L2C, L2P(Y), L5
BDS B1I, B2I, B3I, B1C, B2a, B2b
Galileo E1, E5a, E5b, E6
QZSS L1C/A, L1C, L2C, L5
NavIC L5
Single Point Positioning(RMS)Horizontal: 1.5m
Vertical: 2.5m
DGPS (RMS)Horizontal: 0.4m
Vertical: 0.8m
RTK (RMS)Horizontal: 0.8cm+1ppm
Vertical: 1.5cm+1ppm
PPP(RMS) Horizontal: 5cm
Vertical: 10 cm
Tilt Measurement10 mm + 0.7 mm/°tilt (accuracy < 2.5 cm within 30°)
Positioning Error of INS only
< 5 % of the distance traveled without GNSS signals
Observation Accuracy (RMS)BDSGPSGLONASSGalileo
B1I/B1C/L1 C/A/G1/E1 Code10 cm10 cm10 cm10 cm
B1I/B1C/L1C/A/G1/E1 Carrier Phase1 mm1 mm1 mm1 mm
B2I/B2a/B2b/L5/E5a/E5b Code10 cm10 cm10 cm10 cm
B2I/L2P(Y)/L2C/G2/E5b Carrier Phase1 mm1 mm1 mm1 mm
B3I/B2a/E5a/L5 Code10 cm10 cm10 cm10 cm
B3I/B2a/E5a/L5 Carrier Phase1 mm1 mm1 mm1 mm
Time Accuracy (RMS)20 ns
Velocity Accuracy (RMS)0.03 m/s
Cold start< 12 s
Initialization Time< 5 s (typical)
Initialization Reliability> 99.9%
Data Update Rate100 Hz (IMU RAW Data)
50 Hz* (RTK)
Differential DataRTCM V3.X
Data FormatNMEA-0183, Unicore

Physical Characteristics

Packaging54 pin LGA
Dimension17.0 × 22.0 × 2.6 mm
Weight1.91 g ± 0.03 g

Environmental Specifications

Working temperature-40 °C ~ +85 °C
Storage Temperature-55 °C ~ +95 °C
Humidity95% No condensation
GJB150.16A-2009, MIL-STD-810F
GJB150.18A-2009, MIL-STD-810F

Communication Interface

1 x I2C*
1 x SPI*
1 × CAN* (shared with UART3)

Note: Items marked with * are only supported by specific firmware.


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Comprehensive product feature specifications.

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