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UM681

UM681

Automotive-grade Multi-GNSS Dual-frequency High-precision RTK & INS Integrated Positioning Module
UM681-head

Brief Introduction

UM681 is a high-precision GNSS + IMU integrated positioning and navigation module developed by Unicore for industrial applications. The module is based on the proprietary multi-system, dual-frequency, high-performance GNSS SoC - UC6580I, and is equipped with a 6-axis IMU. It can achieve centimeter-level positioning and can maintain continuous positioning in environments without satellite signals, such as tunnels and underground garages.


Ordering Information

Supply at multiples of 250 pieces



Product Characteristics

  • Supports concurrent operation of GPS, BDS, GLONASS and Galileo (L1 + L5)

  • Provides high-precision positioning service via standard interface

  • Centimeter-level positioning accuracy & raw data output

  • Production process conforms to IATF16949

  • Built-in MEMS, output of integrated navigation results with a single module, continuous positioning even in tunnels and underground parking lots. 

Technical Specifications

Performance Specifications

Channel96 channels, based on UFirebird II
FrequencyGPS L1C/A, L1C*, L5
BDS B1I, B1C*, B2a
GLONASS G1*
Galileo E1, E5a
NavIC L5*
QZSS L1, L5
SBAS L1C/A
ModesSingle-system standalone positioning
Multi-system joint positioning
Time to First Fix (TTFF)Cold Start: < 26 s
Hot Start: < 2 s
Re-acquisition : < 2 s
Single Point Positioning
(RMS)
Horizontal: 1.5 m (open sky)
Vertical: 2.5 m (open sky)
RTK (RMS)Horizontal: 1 cm + 1 ppm (open sky)
Vertical: 2 cm + 1 ppm (open sky)
Positioning error of INS only< 1% of the driving distance without GNSS signals
Velocity Accuracy(RMS)20.05 m/s(open sky)
1PPS20 ns
SensitivityGNSS
Tracking: -162 dBm
cold Start: -147 dBm
Hot Start: -157 dBm
Reacquisition:-158 dBm
Data Update Rate1 Hz / 5 Hz / 10 Hz
Differential DataRTCM V3.X
Data FormatNMEA 0183, Unicore


Physical Specifications

Dimensions22.0 x 17.0 x 2.6 mm
Package54 pin, LGA
Operating Temperature-40°C ~ +85 °C/105 °C
Storage Temperature-40°C ~ +85 °C/105 °C


Electrical Specifications

Voltage2.7 V ~ 3.6 V DC
LNA2.7 V ~ 3.3 V, < 100 mA
Power Consumption1240 mW


Functional Ports

2 × UART*(LVTTL)
1 × I2C*
1 × SPI*
1 × 1PPS(LVTTL)


Functional Characteristics


Passive Antenna, Active Antenna, AGNSS *

NOTE:  * Supported by specific firmware.
             1 Open sky, continuous tracking
             2 68% at 30 m/s for dynamic operation,open sky

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