The accuracy of Unicore GNSS receivers ranges all the way from meter, though sub-meter and centimeter, down to the millimeter level.

Using our own unique technology Unicore has successfully developed and fielded series of multi-system, multi-frequency, high-performance System on a Chip (SoC), and a range of high-precision, board-level GNSS receivers and navigation/timing modules.

Applications include Continuously Operating Reference System (CORS) reference stations, survey & mapping, precision agriculture, positioning & heading, vehicle monitoring, autonomous vehicle navigation, and precision timing – along with a number of other

Unicore is a one-stop provider of GNSS SoC chips and GNSS receivers, with extensive experience in the design, verification, development, implementation and production of highly integrated ICs, along with multi-system high-performance GNSS baseband algorit

Unicore Communications, Inc. is a technology company focused on the design & development of highly integrated ICs, algorithms and GNSS receivers.

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UM442

GPS/BDS/GLONASS/Galileo High precision RTK and Heading Module

Product Introduction

UM442 is cost efficient high precision RTK and heading module developed by Unicore Communications, Inc. UM442 can simultaneously track GPS, BDS,
GLONASS, Galileo. It also supports SBAS and QZSS.
The UM442 adopts Uincore new-generation Nebulas II chip and UGypsophila RTK algorithm. Based on high performance data-sharing technology and simplified operation system of Nebulas II chip, the UGypsophila RTK algorithm dramatically optimizes matrix processing. Therefore the UM442 can track many more satellites and shorten the initialization time to 5 seconds, with on-board MEMS and U-Fusion integrated navigation algorithm, UM442 can achieve accurate and reliable positioning and attitude determination, even in the most challenging environments such as urban canyons, tunnels etc.

Product Characteristics

• 30 × 40mm, SMD packaging
• Centimeter positioning and high performance heading, supports low cost ceramic antenna
• 10Hz GNSS RTK and raw measurement update rate
• Less than 5s RTK initialization time, supports RTK solution at over 20km baseline
• On board MEMS integrated navigation and attitude determination

Data Manual

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Technical Index

Performance Specifications

Channel

432 channels, bases on Nebulas-II chip

Velocity Accuracy(RMS) 0.03m/s

Frequency

GPS L1
BDS B1
GLONASS L1
Galileo E1

Time accuracy (RMS) 20ns

Single Point Positioning (RMS)

Plane:1.5m

Heading accuracy(RMS) 0.2 degree/1m baseline

Elevation:3.0m

Time to First Fix (TTFF) Cold start<40s

DGPS(RMS)

Horizontal:0.4m

Initialization Time <5s (typical)

Vertical:0.8m

Initialization Reliability >99.9%

RTK(RMS)

 

Horizontal:1cm+1ppm

Reacquisition <1s

Vertical:1.5cm+1ppm

Correction
NMEA-0183,
Unicore Binary

Recapture

<1s

Data output RTCM 2.x /3.x

Initiation Time

<10s (Typical)

Update Rate 10Hz

Initiation Reliability

Larger than 99.9%

Power Consumption 1.4W

Differential Data

RTCM 2.X/3.X CMR

   

Data Format

NMEA-0183,Unicore

   

Data Updating Rate

20Hz

   

Positioning Updating Rate

20ns

   

Time Accuracy(RMS)

0.03m/s

   

Network Protocol

0.03m/s

   

Network Protocol

NTRIP、HTTP、FTP

   

Operating Conditions

Parameter Symbol Min. Typical Max Unit
Power Supply (VCC) Vcc 3.0 3.3 3.6 V
Peak Current Iccp     8.8 A
Voltage Input Low
Vin_low_1 -0.3   VCC x 0.3 V
Voltage Input High Vin_high_1 VCC x 0.7
  VCC + 0.3
V
Voltage Output Low Vout_low
0   0.45 V
Voltage Output High Vout_high VCC - 0.45   VCC V
Noise Figure Nftot 2.5 3.3 3.5 dB
LNA ANT1_PWR 3.0 5 5.5 V

Functional Ports

3x UART, 1xI2C, 1x SPI (LV-TTL)
1x PPS(LV-TTL)
1x Event input

Physical Specifications

Size 30 × 40 × 4 mm
Weight 8g
Temperature Humidity
Working :-40°C~+85°C
Storage:-55°C~+90°C
Vibration 95% No condensation
Shock GJB150.16-2009,MIL-STD-810
GJB150.18-2009,MIL-STD-810

Application Area