UNICORECOMM UB4B0M User manual

WWW.UNICORECOMM.COM
INSTALLATION AND OPERATION
USER MANUAL
Data subject to change without notice.
Communications, Inc. Copyright© 2009-2021, Unicore
Compact High Precision Board
All-constellation All-frequency
GPS/BDS/GLONASS/Galileo
UB 4B0M

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Revision History
Version
Revision History
Date
Ver. 2.0
Release
Jun. 2019
R3.0
Add the related description to clarify the VCC
restrictions and LED indicators
Aug. 2019
R3.1
Update Copyright time
Apr. 2020
R3.2
Update technical specification
Jun. 2020
R3.3
Remove description of Inertial device
Jul. 2020
R3.4
Modify the dimensions in the mechanical drawing
Aug. 2020
R3.5
Update IO electrical values and BDS frequencies
Oct. 2020
R4
Remove the description on the MEMS device and
add RF input power consumption of antennas
Apr. 2021
Disclaimer
This manual provides information about the products of Unicore Communications,
Inc. This document does not transfer the patent, trademark, copyright of the
company or any third party, or any right or permission under it by implication,
estoppel or otherwise.
Except as stated in the sales terms and conditions of the products, the company shall
not assume any other responsibilities. Furthermore, Unicore Communications, Inc.
makes no warranty, express or implied, for the sale and/or use of its products,
including the suitability of a particular purpose and marketability of products, or
liability for infringement of any patent, copyright or other intellectual property rights.
If the connection or operation is not in accordance with the manual, the company is
not liable. Unicore Communications, Inc. may make changes to product
specifications and product descriptions at any time without prior notice.
The company's products may contain certain design defects or errors, which will be
included in the corrigendum once found, and may therefore result in differences
between the products’ actual specifications and the published ones. Updated
corrigendum is available upon request.
Before placing an order, please contact our company or local distributors for the
latest specifications.
* Unicore Communications, Unicorecomm, NebulasII and its logo have been applied
for trademark registration by Unicore Communications, Inc.
Other names and brands are the property of their respective owners.

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© Copyright 2009-2021 Unicore Communications, Inc. All rights reserved.
Foreword
The User Manual offers you information in hardware features, installation and use,
and performance indicators of UNICORECOMM UB4B0M.
Note: This manual is a generic version. Please refer to the corresponding chapter of the manual
according to the configuration of the purchased product for more information concerning the
usage requirement of CORS, RTK and Heading.
Target Readers
The User Manual is written for the technicians with certain knowledge about GNSS
Receiver but not for the general readers.

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CONTENTS
1. OVERVIEW .........................................1
1.1 KEY FEATURES ........................................................................................................................2
1.2 TECHNICAL INDEX....................................................................................................................2
1.3 BOARD OVERVIEW...................................................................................................................3
2. HARDWARE COMPOSITION..........................4
2.1 MECHANICAL DIMENSION ........................................................................................................4
2.2 INTERFACE AND PIN FUNCTION ...............................................................................................5
2.3 PIN FUNCTION..........................................................................................................................6
2.4 ELECTRICAL SPECIFICATION....................................................................................................6
2.5 OPERATIONAL CONDITIONS.....................................................................................................7
2.6 PHYSICAL CHARACTERISTIC....................................................................................................7
3. HARDWARE INTEGRATION GUIDE....................7
3.1 DESIGN NOTES........................................................................................................................7
3.2 NOTES FOR PIN .......................................................................................................................9
3.3 ANTENNA .................................................................................................................................9
4. CONNECTION AND SETTING........................10
4.1 ELECTROSTATIC PROTECTION...............................................................................................10
4.2 INSTALLATION GUIDE .............................................................................................................10
4.3 POWER ON.............................................................................................................................13
4.4 SETTINGAND OUTPUT...........................................................................................................13
5. LED INDICATORS ..................................15
6. COMMON COMMANDS SETUP ......................16
6.1 BASE STATION SETTING ........................................................................................................17
6.2 ROVER STATION SETTING .....................................................................................................18
6.3 MOBILE BASE STATION SETTING...........................................................................................18
7. FIRMWARE UPDATE................................19
8. PACKAGING .......................................21

1
1. Overview
UB4B0M is a new generation compact RTK board based on NebulasII high performance
and high accuracy GNSS SoC. It supports signals including BDS B1I/B2I/B3I/B1C/B2a,
GPS L1/L2/L5, GLONASS L1/L2 and Galileo E1/E5a/E5b. UB4B0M is characterized by its
classic small size, supports chip-level multi-path mitigation, and delivers millimeter-level
carrier phase observations and centimeter-level RTK positioning. UB4B0M is particularly
suitable for surveying and mapping, high-precision positioning and navigation application.
UB4B0M adopts UNICORECOMM’s new generation all-system multi-frequency
high-performance SoC - NebulasII. The chip is based on the mature core technology of
XINGYUN baseband chip, supports 432 channels, and integrates a 600MHzARM
processor and a special high-speed floating-point processor, yielding stronger satellite
navigation signal process ability. Making full use of the high-performance date sharing
ability and the super simplified real-time operation system, UB4B0M optimizes the
multi-dimensional RTK matrix pipeline computing, which considerably enhances the RTK
process ability and realizes the multi-system multi-frequency RTK calculating (more than
32 satellites).
The newly designed tri-band RTK engine of UB4B0M can process observation data from
multiple frequencies of BDS, GPS, GLONASS and Galileo, which can significantly
improve the RTK initialization speed, measurement accuracy and reliability in harsh signal
environment like urban areas and shade of trees, and realize long-baseline
centimeter-level RTK positioning.
Figure 1-1 UB4B0M All-constellation All-frequency Compact High Precision Board

UB4B0M User Manual
2
1.1Key Features
Supporting BDS B1I/B2I/B3I/B1C/B2a, GPS L1/L2/L5, GLONASS L1/L2, Galileo
E1/E5a/E5b, etc.
Millimeter-level carrier-phase observation data
Centimeter-level high-precision RTK positioning
Hardware size compatible with the mainstream GNSS OEM boards on the
market
NebulasII based new generation multi-system multi-frequency high-performance
SoC
Supporting single-system independent positioning and multi-system integrated
positioning as well as BDS/GPS/GLONASS/Galileo independent PVT output
Supporting advanced multi-path mitigation
Supporting 3 serial ports and 1 1PPS
1.2 Technical Index
Table 1-1: Performance
Channels
432 channels, based on
NebulasII
Cold Start
< 25 s
Frequency
BDS B1I/B2I/B3I/B1C*/B2a*
GPS L1/L2/L5
GLONASS L1/L2
Galileo E1/E5a/E5b
QZSS L1/L2/L5
Re-acquisition
< 1 s
Single Point
Positioning (RMS)
Horizontal: 1.5 m
Vertical: 2.5 m
RTK Initialization Time
< 5 s (Typical)
Initialization Reliability
> 99.9%
DGPS (RMS)
Horizontal: 0.4 m
Vertical: 0.8 m
Differential Data
RTCM
3.0/3.2/3.3
RTK (RMS)
Horizontal: 1 cm + 1 ppm
Vertical: 1.5 cm+1 ppm
Data Format
NMEA-0183
Unicore
Observation
Accuracy (RMS)
BDS GPS GLONASS Galileo
Data Update Rate
20 Hz
Positioning Update Rate
20 Hz
B1/L1 C/A/E1 Code
10 cm 10 cm 10 cm 10 cm
Time Accuracy (RMS)
20 ns
B1/L1/E1 Carrier
Phase
1mm 1 mm 1 mm 1 mm
Velocity Accuracy (RMS)
0.03 m/s
B2/L2P(Y)/L2C/E5b
10 cm 10 cm 10 cm 10 cm
Power Consumption
1.8W (Typical)

3
Code
B2/L2/ L2C/E5b
Carrier Phase
1 mm 1 mm 1 mm 1 mm
B3/L5/E5a Code
10 cm 10 cm 10 cm
B3/L5/E5a Carrier
Phase
1 mm 1 mm 1 mm
Note: The part marked with * is optional
1.3 Board Overview
Figure 1-2 UB4B0 Structure Diagram
1. RF Part
The receiver gets filtered and enhanced GNSS signal from the antenna via a coaxial cable.
The RF part converts RF input signal into IF signal, and converts IF analog signal into
digital signal which NebulasII (UC4C0) digital processing requires.
2. NebulasII SoC (UC4C0)
The UB4B0M incorporates the processing from the NebulasII SoC, UNICORECOMM’s
new generation high precision GNSS SoC with 55 nm low power design, which supports
432 channels and is equipped with a built-in UNICORECOMM’s new generation
baseband engine. The chip integrates a 600 MHzARM processor and a special
high-speed floating-point processor as well as a special anti-interference unit.A NebulasII
SoC can complete high-precision baseband processing and RTK positioning and heading
calculation.
Interface

UB4B0M User Manual
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3. 1PPS
UB4B0M provides 1 PPS signal with adjustable pulse width and polarity.
4. Event
UB4B0M provides 1 Event Mark Input signal with adjustable pulse width and polarity.
2. Hardware Composition
2.1 Mechanical Dimension
Table 2-1 Mechanical Dimension
Parameter
Value (mm)
Tolerance
Length
71.1
-0.2 mm, +0.5 mm
Width
45.7
±0.2 mm
Height (PCB）
1.6
±10%
RF Connector
6.00
±0.2 mm
Shield
1.9
±0.2 mm
Pin Distance
5.6
±0.2 mm

5
Figure 2-1 Mechanical Structure Drawing
2.2 Interface and Pin Function
Apart from the antenna RF interface, UB4B0M provides the following 20 Pin SAMTEC
dual-row pin. The pin distance: 2.0 mm; pin length: 4.0 mm; base thickness: 1.5 mm.
Figure 2-2 Pinout

UB4B0M User Manual
6
2.3 Pin Function
Table 2-2 Pin Definition
No
Signal
Type
Description
Note
1
RSV
Reserved
Reserved
2
3.3V
PWR
Power input
3.3 V~5 V（+5%/-3%）
3
Reserved
IO
Reserved
Reserved
4
RXD3
IO
COM3 Receive data
LVTTL Level
5
RESETIN
I
Reset-input
Low level effective,
duration >5 ms
6
Reserved
O
Reserved
Reserved
7
EVENT
IO
Event input
No support currently
8
RSV
Reserved
Reserved
9
TXD3
O
COM3 Send data
LVTTL Level
10
GND
PWR
DGND&GND
11
TXD1
O
COM1 Send data
LVTTL Level
12
RXD1
I
COM1 Receive data
LVTTL Level
13
GND
PWR
DGND&GND
14
TXD2
O
COM2 Send data
LVTTL Level
15
RXD2
I
COM2 Receive data
LVTTL Level
16
GND
PWR
DGND&GND
17
PV
O
Position validity
indication
High level effective
If LED indicators are needed,
please connect this pin to the
positive pole of the LED diode.
18
GND
PWR
DGND&GND
19
PPS
O
Time mark output
LVTTL Level
20
RSV
Reserved
Reserved
2.4 Electrical Specification
Table 2-3 Absolute Maximum Rating
Parameter
Symbol
Minimum
Maximum
Unit
VCC
Vcc
-0.3
5.5
V
Input Pin Voltage
Vin
-0.3
3.6
V
VCC Maximum Ripple
Vrpp
0
50
mV
Input Pin Voltage (all other pins in
addition to the mentioned ones)
Vin
-0.3
3.6
V
RF Input Power Consumption of
Antenna
ANT_IN input
power
+15
dBm
Maximum Bearable ESD Stress Level
VESD (HBM)
±2000
V