UM981
UM981
GPS/BDS/GLONASS/Galileo/QZSS All-constellation Multi-frequency RTK/INS Integrated Positioning Module
Unicore's new-generation proprietary RTK/INSintegrated 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.
Features
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 interference suppression and interference 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
Technical Specifications
Performance Specifications
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Channel |
1408 channels, based on NebulasIV |
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Frequency |
GPS L1C/A, L1C, L2C, L2P(Y), L5 |
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BDS B1I, B2I, B3I, B1C, B2a, B2b |
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GLONASS G1, G2, G3 |
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Galileo E1, E5a, E5b, E6 |
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QZSS L1C/A, L1C, L2C, L5 |
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NavIC L5 |
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SBAS L1C/A |
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Single Point Positioning(RMS) |
Horizontal: 1.5m |
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Vertical: 2.5m |
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DGPS (RMS) |
Horizontal: 0.4m |
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Vertical: 0.8m |
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RTK (RMS) |
Horizontal: 0.8cm+1ppm |
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Vertical: 1.5cm+1ppm |
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PPP（RMS） |
Horizontal: 5cm |
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Vertical: 10 cm |
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Tilt Measurement |
10 mm + 0.7 mm/°tilt (accuracy < 2.5 cm within 30°) |
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Positioning Error of INS only |
< 5 % of the distance traveled without GNSS signals |
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Observation Accuracy (RMS) |
BDS |
GPS |
GLONASS |
Galileo |
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B1I/B1C/L1 C/A/G1/E1 Code |
10 cm |
10 cm |
10 cm |
10 cm |
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B1I/B1C/L1C/A/G1/E1 Carrier Phase |
1 mm |
1 mm |
1 mm |
1 mm |
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B2I/B2a/B2b/L5/E5a/E5b Code |
10 cm |
10 cm |
10 cm |
10 cm |
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B2I/L2P(Y)/L2C/G2/E5b Carrier Phase |
1 mm |
1 mm |
1 mm |
1 mm |
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B3I/B2a/E5a/L5 Code |
10 cm |
10 cm |
10 cm |
10 cm |
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B3I/B2a/E5a/L5 Carrier Phase |
1 mm |
1 mm |
1 mm |
1 mm |
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Time Accuracy (RMS) |
20 ns |
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Velocity Accuracy (RMS) |
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Cold start |
< 12 s |
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Initialization Time |
< 5 s (typical) |
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Initialization Reliability |
> 99.9% |
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Data Update Rate |
100 Hz (IMU RAW Data) |
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50 Hz* (RTK) |
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Differential Data |
RTCM V3.X |
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Data Format |
NMEA-0183, Unicore |
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Physical Characteristics
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Packaging |
54 pin LGA |
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Dimension |
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Weight |
Environmental Specifications
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Working temperature |
-40 °C ~ +85 °C |
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Storage Temperature |
-55 °C ~ +95 °C |
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Humidity |
95% No condensation |
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Vibration |
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Shock |
Communication Interface
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3 x UART (LVTTL) |
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1 x I2C* |
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1 x SPI* |
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1 × CAN* (shared with UART3) |
Note: Items marked with * are only supported by specific firmware.
For more information about unicore communicationsand anti-jamming, please feel free to contact us!
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