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UM981S

UM981S

GPS/BDS/GLONASS/Galileo/QZSS All-constellation Multi-frequency RTK/INS Integrated Positioning Module
UM981S2

Brief Introduction

UM981S is Unicore's new-generation RTK and INS integrated positioning module. Based on the NebulasIV GNSS SoC which integrates RF, baseband, and high-precision algorithm, it is capable of simultaneously tracking GPS, BDS,GLONASS, Galileo, QZSS, NavIC and SBAS signals. The module integrates a high-speed floating-point processor, a dedicated RTK co-processor, and a built-in professional IMU, enabling RTK positioning results output at up to 50Hz and IMU raw data output at 100Hz. It incorporates the JamShield anti-jamming technology to complete enhanced multi-system multi-frequency RTK engine processing, significantly improving RTK initialization speed, measurement accuracy, and reliability in complex environments such as urban canyons and under tree shade. UM981S is designed for surveying and mapping applications and features tilt compensation capability.



Features

  • Based on Unicore's proprietary GNSS SoC NebulasIV that integrates RF, baseband and high- precision algorithm

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

  • Instant RTK initialization technology

  • Excellent anti-jamming and anti-spoofing capabilities, supporting jamming detection and spoofing detection

  • Heading2 technology to provide orientation information

  • STANDALONE single-station high-precision positioning technology

  • Supports B2b-PPP, E6-HAS and QZSS L6E (MADOCA) PPP

  • On-board MEMS integrated positioning technology and tilt compensation capability



Technical Specifications

Performance Specifications

Channel1408 channels, based on NebulasIV
FrequencyGPS L1C/A, L1C, L2C, L2P(Y), L5
BDS B1I, B2I, B3I, B1C, B2a, B2b
GLONASS G1, G2, G3
Galileo E1, E5a, E5b, E6
QZSS L1C/A, L1C, L2C, L5, L6
NavIC L5
SBAS L1C/A
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 Measurement(UM981S)10 mm + 0.7 mm/°tilt (accuracy < 2.5 cm within 30°)
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/G3/E5a/E5b Code10 cm10 cm10 cm10 cm
B2I/B2a/B2b/L5/G3/E5a/E5b Carrier Phase1 mm1 mm1 mm1 mm
B3I/L2P(Y)/L2C/G2/E6 Code 10 cm10 cm10 cm10 cm
B3I/L2P(Y)/L2C/G2/E6 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
Vibration
GJB150.16A-2009, MIL-STD-810F
Shock
GJB150.18A-2009, MIL-STD-810F


Communication Interface

3 x UART (LVTTL)
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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