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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!

Location : F3, BDStar Navigation Building, No.7, Fengxian East Road, Haidian, Beijing, P.R.China,100094, 100094 Beijing,
Contact : comm unicore, +86 10 69939800

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