UM981

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

Technical Specifications

Channel	1408 channels, based on NebulasIV
Frequency	GPS L1C/A, L1C, L2C, L2P(Y), L5
	BDS B1I, 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
Attitude Accuracy	Heading	Roll	Pitch
	0.3°	0.2°	0.2°
Positioning Error of INS only	< 5 % of the distance traveled without GNSS signals
Observation Accuracy (RMS)	BDS	GPS	GLONASS	Galileo
B1I/B1C/L1C/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/G3/E5a/E5b Code	10 cm	10 cm	10 cm	10 cm
B2I/B2a/B2b/L5/G3/E5a/E5b Carrier Phase	1 mm	1 mm	1 mm	1 mm
B3I/L2P(Y)/L2C/G2/E6 Code	10 cm	10 cm	10 cm	10 cm
B3I/L2P(Y)/L2C/G2/E6 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

3 x UART (LVTTL)

1 x I²C*

1 x SPI*

1 × CAN*

Note: Items marked with * are only supported by specific firmware.

UM981_Product_Brief_En

20/04/2026

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