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 > UB351


BDS/GPS/GLONASS Tri-System Pent-Frequency High Precision Board

Brief Introduction

UB351 is BDS/GPS/GLONASS Tri-system Pent-Frequency OEM Board developed by Unicore based on its mature BDS compatible multi-system GNSS SoC. UB351 uses low power consumption design and offers millimeter level carrier phase observation and centimeter level RTK positioning accuracy, and support multi-path mitigation. Advanced technologies of instant RTK and high precision heading are particularly appropriate for the application of high precision positioning, navigation, and heading.
In Accordance with the Design Standard of being Small and Classic
UB351 is totally compatible with the main stream OEM boards in dimensions, electrical standards for the convenience of user's further development. 
Rapid RTK Integer Ambiguity Resolution
With super strong RTK Algorithms, UB351 provides more rapid acquisition and simultaneous Multi-GNSS RTK solution, thus ensure customers to take advantage of Multi-GNSS.
Graphical Interface
Based on the graphical Control and Display Tool (CDT), the status, SNR and elevating angle of the satellites of all the constellations could be displayed on the screen, thus offers the best convenience to application development.
Instant Heading Technology
With innovated RTK algorithm, Unicore has developed the real-time dynamic heading technology on variable baseline length for moving base station. High quality carrier observation and perfect RTK algorithm can provide a 0.2° heading accuracy on a 1 meter baseline.
Mature GNSS SoC Technology
As UB351's core processor, by far more than 100,000 pieces of unicore's high performance multi-system multi-frequency SoC chip - (NebulasTM)1, has been applied in the market, the SoC chip is characterized by small size, low power consumption and high reliability.

Product Characteristics

• Compatible with main stream GNSS OEM boards in dimension
• Support BDS B1/B3* + GPS L1/L2 + GLONASS L1
• Better than 1mm carrier phase observation
• Support centimeter level high precision RTK
• Better than 0.2° heading accuracy on 1 meter baseline

Basic Features

• Based on multi-system, multi-frequency, high performance SoC - Nebulas

• In support of the single system positioning and multi-system positioning
• Advanced technology of multi-path mitigation
• Low Power Consumption, small in dimension

Data Manual

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Technical Index

Performance Specifications

Channel Based on 192-Channel SoC - Nebulas    
Frequency BDS B1/B3 + GPS L1/L2 + GLONASS L1 Initialization time < 10s ( Typical)
Single Point
Position (RMS)
Initialization reliability > 99.9%
Vertical:3.0m Time to First Fix (TTFF) Cold Start:50s
RTK(RMS) Horizontal:10mm + 1ppm
Correction RTCM 2.X/3.X CMR
Vertical:15mm + 1ppm Data Output NMEA-0183,Unicore Protocol
Measurement Precision(RMS) BDS     GPS       GLO Update Rates* 20Hz
B1/L1 C/A 10cm   10cm   10cm Time Accuracy (RMS) 20ns
B1/L1 Carrier Phase 1mm    1mm    1mm Velocity Accuracy (RMS) 0.03m/s
B3/L2P(Y) 10cm   10cm    
B3/L2 Carrier Phase 1mm    1mm    

Physical Specifications

Dimensions 46 × 71 × 13 mm I/O Connectors 2 x 10 pin
Weight 26g Antenna input 1 × MCX
Temperature Operating:-40°C ~ +85°C Vibration GJB150.16-2009,MIL-STD-810
  Storage:-55°C ~ +95°C Shock GJB150.18-2009,MIL-STD-810
Humidity 95% non-condensing    

Electrical Specifications

Voltage 3.3V + 5%/-3% LNA 4.75 ~ 5.10 V, 100 mA
Ripple Voltage 100mV p-p(max) Power Consumption 1.3W (typical)

Functional Ports

Serial 3x UART (LVTTL)

Application Area