UM981

UM981

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.

 

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

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.

 

For more information about unicore communications and anti-jamming, please feel free to contact us!