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.

Home > Product Center > UB4B0


GNSS High Precision Board

Brief Introduction

UB4B0 is a multi-system GNSS high-precision board based on a new-generation Nebulas-II high-per formance GNSS SoC developed by Unicore Communications. It supports BDS, GPS, GLONASS, Galileo and QZSS satellite navigation systems. The board adopts triple-frequency RTK technology and can be used for high-precision positioning, navigation and mapping, etc.

Multi-system and Multi-frequency Signal Processing

UB4B0 simultaneously tracks signals from BDS, GPS, GLONASS, Galileo and QZSS and supports tri-band signals from BDS, GPS and Galileo, delivering “instantaneous” RTK initialization and achieving 1-2 cm positioning accuracy. Even in shades or from a long distance, the board still obtains RTK positioning results quickly and reliably.

Nebulas-II GNSS SoC

UB4B0M is based on Unicore’s  Nebulas-II multi-system, multi-core, high precision SoC. The SoC supports 432 channels, includes a built-in high performance ADC, an anti-interference unit, two 600MHz ARM processors and two precision floating-point processing units, providing powerful GNSS signal processing capability. capabilities.

Adaptive Anti-interference

Due to a powerful Nebulas-II chip and its high linearity, wide dynamic RF front-end design UB4B0 can effectively suppress narrow band and single-tone radio interference in the GNSS signals. Thus, the customers obtain accurate positioning results even in complex electromagnetic environments.

Rich set of interfaces

UB4B0 is also equipped with interfaces of serial port, USB port, Ethernet port, 1PPS, external clock, CAN and odometer, which can satisfy the needs of various applications. UB4B0 onboard LAN ports can support high-speed output of large amount of data and multiple data streams. It also supports network protocols of TCP / IP, FTP, NTRIP and HTTP.

Basic Features

• Supports both single and multi-system positioning

• Advanced multi-path mitigation technology and low levation tracking technology

• Supports serial port, Ethernet port, 1PPS and external timer, odometer interface

• Compatible with mainstream board interface and dimension

Product Characteristics

• Nebulas-II System-on-a-Chip

• 432 channels

• Supports BDS, GPS, GLONASS, Galileo and QZSS

• Supports BDS BD3 signal

• High precision RTK positioning

• Millimeter-level carrier phase observation

Data Manual

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Technical Index

Performance Specifications


432 channels, bases on Nebulas-II chip

Cold Start

< 25s


BDS B1 / B2 / B3

Hot Start

< 10s

GPS L1 / L2 / L5


< 1s


Initiation Time

< 10s (Typical)

GALILEO E1 / E5a / E5b

Initiation Reliability

Larger than 99.9%

QZSS L1 / L2 / L5

Differential Data


Single Point Positioning (RMS) Plane:1.5 m

Data Format


Elevation:3.0 m

Data Updating Rate

20 Hz


Plane:10 mm + 1 ppm

Positioning Updating Rate

20 ns

Elevation:15 mm + 1 ppm

Time Accuracy(RMS)

0.03 m/s



Network Protocol


Electrical Specifications

Voltage 3.3VDC +5%/–3%
LNA 4.75~5.10V, 0~100 mA
3.0-3.3V DC
Ripple Voltage 100mV p-p(max)
Power Dissipation 2.8W (Typical)


Voltage 3.3VDC +5%/–3%
LNA 4.75~5.10V, 0~100 mA
3.0-3.3V DC
Ripple Voltage 100mV p-p(max)
Power Dissipation 2.8W (Typical)
I/O Connectors 2x12 pin
2x8 pin
Antenna Input
External Oscillator MMCX

Functional Ports

Serial Port 1x UART (RS-232),
Internet Access 1x LAN,10/100M)
USB Port 1x USB 2.0 Host&Deveice
CAN Port 1xCAN
1x wheel pulse,
1x driving direction
1PPS interface 2xLV-TTL

Application Area