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UM981 GNSS Module

Category： UnicoreComm
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Product Description:

UM981

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

Unicore has developed an advanced proprietary navigation module that combines Real-Time Kinematic (RTK) and Inertial Navigation System (INS) technologies. This module features a high-speed floating-point processor alongside a dedicated coprocessor for RTK, allowing it to deliver Inertial Measurement Unit (IMU) raw data at a frequency of 100Hz and RTK data at 50Hz. The integrated MEMS chip and sophisticated algorithms facilitate consistent and high-quality positioning, even in environments where Global Navigation Satellite System (GNSS) signals are obstructed, such as within buildings, tunnels, overpasses, and shaded regions. Due to its exceptional precision and performance, the UM981 is particularly advantageous for applications in surveying and precision agriculture, among others.

APPLICATIONS


• Surveying and Mapping	• Precision Agriculture
• Intelligent Driving

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 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


Channel	1408 channels, based on NebulasIV
	GPS L1C/A, L1C, L2C, L2P(Y), L5
	BDS B1I, B2I, B3I, B1C, B2a, B2b
	GLONASS G1, G2, G3
	Galileo E1, E5a, E5b, E6
Frequency	QZSS L1C/A, L1C, L2C, L5
	NavIC L5
	SBAS L1C/A
Single Point Positioning(RMS)	Horizontal: 1.5m
Single Point Positioning(RMS)	Vertical: 2.5m
DGPS (RMS)	Horizontal: 0.4m
DGPS (RMS)	Vertical: 0.8m
RTK (RMS)	Horizontal: 0.8cm+1ppm
RTK (RMS)	Vertical: 1.5cm+1ppm
PPP（RMS）	Horizontal: 5cm
PPP（RMS）	Vertical: 10 cm
Tilt Measurement	10 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)	BDS1GPS1GLONASS Galileo
B1I/B1C/L1 C/A/G1/E1 Code	10cm110cm110cm1 10cm
B1I/B1C/L1C/A/G1/E1 Carrier Phase	1mm1 1mm1 1mm121mm
B2I/B2a/B2b/L5/E5a/E5b Code	10cm110cm110cm1210cm
B2I/L2P(Y)/L2C/G2/E5b Carrier Phase	1mm1 1mm1 1mm121mm
B3I/B2a/E5a/L5 Code	10cm110cm1 10cm1 10cm
B3I/B2a/E5a/L5 Carrier Phase	1mm 11mm1 1mm121mm
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 Rate	100 Hz (IMU RAW Data)
	50 Hz* (RTK)
Differential Data	RTCM V3.X
Data Format	NMEA-0183, Unicore

Physical Characteristics


Packaging	54 pin LGA
Dimension	17.0 × 22.0 × 2.6 mm
Weight	1.91 g ± 0.03 g

Environmental Specifications


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