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UM981

Name: UM981
Brand: Unicore Communications，Inc.

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.

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
Frequency	GPS 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
	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	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)	BDS	GPS	GLONASS	Galileo
B1I/B1C/L1 C/A/G1/E1 Code	10 cm	10 cm	10 cm	10 cm
B1I/B1C/L1C/A/G1/E1 Carrier Phase	1 mm	1 mm	1 mm	1 mm
B2I/B2a/B2b/L5/E5a/E5b Code	10 cm	10 cm	10 cm	10 cm
B2I/L2P(Y)/L2C/G2/E5b Carrier Phase	1 mm	1 mm	1 mm	1 mm
B3I/B2a/E5a/L5 Code	10 cm	10 cm	10 cm	10 cm
B3I/B2a/E5a/L5 Carrier Phase	1 mm	1 mm	1 mm	1 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 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

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.

Download

UM981_Product_Brief_En

25/12/2023

VIEW

UM981_User Manual_EN_R1.1

18/09/2024

VIEW

Product Data Sheet Request

Comprehensive product feature specifications.

Please provide your contact information via this contact form and we will email you an electronic copy of the comprehensive product data sheet immediately. Select the subscription option to be sent future versions of the data sheet as new data is added, or amendments are applied.

CONTACT

Tel:+86-10-69939800
Sales tel:+86-10-69939828
Fax:+86-10-69939888
E-mail:info@unicorecomm.com

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