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 > UR4B0


BDS/GPS/GLONASS/Galileo Multi-system Multi-frequency High Precision Receiver

Product Characteristics

• Supports BDS BD3 signal
• Supports BDS B1/B2/B3 + GPS L1/L2/L5 + GLONASS L1/L2 + Galileo E1/E5a/E5b + QZSS L1/L2/L5
• Millimeter level carrier phase observation
• Built-in 32G memory
• Supports FTP server and FTP push file transfer
• Supports NTRIP real time data streams

Brief Introduction

UR4B0 is a new generation, multi-system and multi-frequency high precision CORS receiver supporting triple-frequency BDS navigation satellite system. It is based on Unicore’ multi-system, multi-frequency and high performance GNSS SoC – Nebulas-II™ and features millimeter level carrier phase observation, large memory, multiple communication interfaces and protocols. It is especially suitable for surveying, meteorology, earthquake and deformation monitoring, scientific research and other high precision measuring and positioning fields.

Multi-system CORS receiver supporting tri-band signal of Beidou system

As a high precision CORS receiver, UR4B0 also supports BD B1, B2, B3 signals and Galileo system, besides the existing reference station applications based on GPS/GLONASS system. This ensures a seamless upgrade process of existing CORS system services and reduces the upgrade costs for CORS operators.

Supports standard interface protocols for CORS applications

UR4B0 supports multiple standard application interfaces of CORS receiver, such as a network interface, RS232, 1PPS and an external clock. It meets the demands for remote control and data transfer of the receivers, time synchronization of station devices, stable atomic clock and other peripheral interfaces. UR4B0 supports TCP/IP, HTTP, NTRIP and FTP Protocols, available to transmit the raw observation data streaming, real-time differential data streams and observation file of the receiver through network interface.

Nebulas-II GNSS SoC

UR4B0 is based on Unicore’s Nebulas-II multi-system, multi-core high precision SoC. It supports 432 channels as well as includes a built-in broadband ADC and an anti-interference unit, while the two 600MHz ARM processors and a special high-speed, floating-point operation CPU provide more powerful signal processing capabilities

Friendly Operation Interface

UR4B0 supports web interface, so users can configure the boards web interface through Internet Explorer to realize status monitoring, such as satellite tracking, positioning and data storage. In addition, users can also conduct operations like remote restart and firmware upgrade. Four LED indication lights and one button are provided on the front panel, enabling operations of power-on and data recording as well as indicating the status of the power supply, satellite and positioning.

Basic Features

• Based on a multi-system, multi-frequency and high-performance Nebulas-II SoC
• Supports single system independent positioning and multi-system interoperation
• Advanced multi-path mitigation technology
• Secure and stable embedded Linux OS

Data Manual

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Technical Index

Performance Specifications

432 channels,
based on Nebulas II GNSS SoC
Frequency BDS B1/B2/B3
GPS L1/L2/L5
Galileo E1/E5a/E5b
Single Point Position (RMS) Horizontal: 1.5 m
Vertical: 3.0 m
Static Horizontal: 2.5 mm + 1 ppm
Vertical: 5.0 mm + 1 ppm
RTK Horizontal: 10 mm + 1 ppm
Vertical: 15 mm + 1 ppm
Measurement Precision(RMS) Code: 10 cm
Carrier Phase: 1 mm
Time to First Fix (TTFF) Cold Start: 50 s
Reacquisition 1 s
Initalization Time 10 s(typical)
Initalization Reliability 99.9%
Correction RTCM 2.x/3.x, CMR
Data Output NMEA-0183,UNICORE
Update Rate 20 Hz(optional)
Time Accuracy (RMS) 20 ns
Velocity Accuracy (RMS) 0.03 m/s
Control Interface WEB、Uprecise
Network Protocol NTRIP、HTTP、FTP

Physical Specifications

Dimensions 222 × 164 × 79 mm
Weight 1.8 Kg

Power Input

 12 VDC± 10%

Environmental Specifications

Operating -40℃~+65℃
Relative humidity,95% non-condensing

External Oscillator Input

Connector BNC(F),50 Ω
External Clock Input Frequency 10 MHz
Signal Level 0 dBm ~ 10 dBm

RF Input/LNA Power Output

Antenna Connector TNC,50 Ω
Acceptable RF Input Level
-80 dBm ~ -105 dBm
LNA 4.75 ~ 5.10 V, 0 ~ 100 mA

Functional Ports

Serial Port 1* RJ45
Ethernet 1* SMA

Application Area