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

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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

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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

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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

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2.5 Operational Conditions
Table 2-4 Operational Conditions
Parameter
Symbol
Minimum
Typical
Maximum
Unit
Condition
VCC
Vcc
3.2
3.3
5.0
V
Power-on Impulse
Current*
Iccp
10
A
Vcc=3.3 V
Input Pin Low Level
Vin_low_1
-0.3
0.9
V
Input Pin High Level
Vin_high_1
2.4
3.6
V
Output Pin Low Level
Vout_low
0
0.45
V
Iout=4 mA
Output Pin High Level
Vout_high
2.85
3.3
V
Iout=4 mA
Optimum Input Gain
Gant
20
36
dB
Power Consumption
P
1.8
1.9
W
Note: Since the product contains capacitors at the input, inrush current will occur during
power-on. Evaluate in the actual environment in order to check the effect of the supply voltage
drop due to the inrush current.
2.6 Physical Characteristic
Table 2-5 Physical Characteristic
Size
46 ×71 ×13 mm
Weight
28 g
Temperature
Operating Temperature: -40℃～+85℃
Storage Temperature: -55℃～+95℃
Humidity
95% non-condensation
I/O Interface
2×10 Pin
Antenna Interface
1×MCX
Vibration
GJB150.16-2009, MIL-STD-810
Shock
GJB150.18-2009, MIL-STD-810
3. Hardware Integration Guide
3.1 Design Notes
For the normal operation of UB4B0M, the following signals need to be connected
correctly:
The module VCC power-on behavior is repeatable, the initial level is lower than
0.4V, and the undershoot and ringing should be guaranteed to be within 5% VCC

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Use VCC pin to provide reliable power source and earth all GND pin of the board
MMCX interface provides 4.6±0.2 V feed, and notice 50Ωimpedance matching
for the circuit. Do not connect the antenna to the port of antenna in the module,
and use a multimeter for testing, that is, the voltage supply is DC 4.8 V ~ 5.4 V
when there is no-load. When the RF port of the module is connected to the
antenna, the working current is 30~100 mA at normal temperature, and the
antenna feed of DC 4.6 V±0.2 V can be supplied to the outside.
Ensure the output of serial port 1. Users need to use this serial port to receive the
positioning data and to update the software
In order to acquire satisfactory performance, the following points should also be
particularly noticed:
Power supply: Satisfactory performance cannot be achieved without a stable and
low-ripple power source. The peak value of the ripple voltage should not exceed
50mVpp. In addition to adopting LDO to guarantee uninterruptible power supply,
the following points should also be taken into consideration:
‒Widen power supply wires or use split copper pour surface to transmit
current
‒Try to place LDO close to the board
‒Power supply wires should not pass through any high power and high
inductance devices such as magnetic coils
UART interface ensures that the signal and baud rate of the main device are
consistent with those of UB4B0M.
Antenna wires should be as short and smooth as possible; avoid sharp angle
and pay attention to impedance matching.
Avoid wiring right beneath UB4B0M.
Keep the board away as far as possible from any high temperature airflow.

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3.2 Notes for Pin
Table 3-1 Notes for Pin
Pin
I/O
Description
Note
Power
Supply
VCC
Power
source
Power supply
Stable, uninterruptible, and low-ripple
power; the peak value of ripple voltage
should not exceed 50mVpp.
MCX
Power
source
Antenna
power supply
Active antennas supply power at a
corresponding voltage. Do not connect
the antenna to the port of antenna in the
module, and use a multimeter for testing,
that is, the voltage supply is DC4.8 V ~
5.4 V when there is no-load. When the
RF port of the module is connected to the
antenna, the working current is 30~100
mA at normal temperature, and the
antenna feed of DC4.6 V±0.2 V can be
supplied to the outside.
GND
Power
source
Ground
Ground all GND signals of the board,
preferably with a larger area of copper
pour.
UART
TXD1
O
Send from
Serial Port 1
Output by Serial Port 1; leave vacant if
not necessary.
RXD1
I
Receive by
Serial Port 1
Output by Serial Port 1; leave vacant if
not necessary.
TXD2
O
Send from
Serial Port 2
Output by Serial Port 2; leave vacant if
not necessary.
RXD2
I
Receive by
Serial Port 2
Output by Serial Port 2; leave vacant if
not necessary.
TXD3
O
Send from
Serial Port 3
Output by Serial Port 3; leave vacant if
not necessary.
RXD3
I
Receive by
Serial Port 3
Output by Serial Port 3; leave vacant if
not necessary.
3.3 Antenna
Antenna input MCX interface of UB4B0M provides an antenna feed of 4.6±0.2 V. Do not
connect the antenna to the port of antenna in the module, and use a multimeter to test,
that is, the voltage supply is DC4.8 V ~ 5.4 V when there is no-load. When the RF port of
the module is connected to the antenna, the working current is 30~100 mA at normal
temperature, and the antenna feed of DC4.6 V±0.2 V can be supplied to the outside.

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When adopting active antennas, pay attention to the 50Ω impedance match between the
antennas.
Figure 3-2 UB4B0M Antenna Connection Diagram
4. Connection and Setting
4.1 Electrostatic Protection
Many components on UB4B0M are vulnerable to electrostatic damage, which will then
affect IC circuits and other components. Please take the following electrostatic protection
measures before opening the anti-static blister box:
Electrostatic discharge (ESD) will damage components. Please operate the
board on the anti-static work table and at the same time wear an anti-static
wristband and use conductive foam pads. If no anti-static bench is available,
please wear an anti-static wristband and connect it to the metal part of the
machine for anti-static protection.
When plugging or unplugging the board, please do not touch the components on
the board directly.
After taking out the board, please check the components carefully for obvious
relaxation or damage.
4.2 Installation Guide
UB4B0M is delivered in the form of board, allowing users to assemble it flexibly according
to application scenarios and market needs. The following figure shows a typical UB4B0M
installation method using a set of evaluation kit (EVK). Users can also, in the same way,
use other receiver casings to install.

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Figure 4-1 UB4B0M Installation Diagram
To ensure efficient installation, please prepare the following tools before installing the
board:
UB4B0M board and EVK
User manual
Command manual
UPrecise display and control software
Qualified antennas
MCX antennas and connecting cables
Desktop or laptop (Win7 and above) with serial ports, installed relevant serial
driver and UPrecise software
Step 1. For the UB4B0M EVK users, align UB4B0M positioning holes and pins with EVK.
Note: If the EVK connector hole is 24-pin, connect the middle 24 pins of the board to the
connector). EVK provides power supply and standard communication interface to the board to
communicate with peripheral devices (such as PC, CAN and USB devices)
Step 2. Select a GNSS antenna with appropriate gain, and set it in a stable and open area.
Connect the antenna to the board through coaxial radio frequency cable. When
the antenna is installed, the MCX antenna interface on UB4B0M corresponds to
the antenna signal interface.

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Figure. 4-2 UB4B0M Connecting to Antenna RF Wires
Note: The RF connector on the board is MMCX. Please select the appropriate cable according to
the packaging. The input signal gain of the antenna connector should be within 25 to 36dB. Plug
and unplug the MCX RF head vertically and the time of this operation is limited. Improper
plugging or unplugging will lead to damage to the RF head or MCX male connector head.
Step 3. Connect the PC to EVK through serial ports.
Step 4. Connect a 12V adapter to the EVK power source, and switch on to power
UB4B0M.

13
Figure. 4-3 UB4B0M Power on EVK
Step 5. Start the UPRECISE control software on PC and connect to the receiver through
the software.
Step 6. Operate the receiver via UPRECISE and record the relevant data.
4.3 Power on
The supply voltage of UB4B0M is 3.3 V, and the supply terminal voltage of EVK is 12 V.
After powered on, the receiver starts up and can quickly establish communication.
4.4 Setting and Output
The satellite display and control software UPRECISE provides a graphical interface so
that users can set up the receiver conveniently and be aware of the receiver status and
relevant information rapidly.
UPrecise possesses the following basic functions：
Connecting the receiver and configure the baud rate, etc.
Displaying the preliminary position of satellite, PRN, and Signal/Noise Ratio in
the graphical window (Constellation View)
The trajectory window displaying the present and historical point and the position

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velocity and time (Trajectory View)
Graphic interface for data logging and sending commands to the receiver
(Logging Control View)
Console window for sending commands to the receiver (Console View)
Sending commands to the receiver
Displaying the track point
Upgrading the firmware
TTFF test
Figure. 4-4 UPrecise Interface
4.4.1 Operation Steps
Step 1. Follow 4.2 Installation Guide to connect the power source, antenna to the board,
and turn on the EVK switch
Step 2. Click file - > connect the serial port, and set the baud rate; the default baud rate of
UB4B0M is 115200bps
Figure. 4-5 Connect the Serial Port

15
Step 3. Click the receiver settings button to configure the NMEAmessage output. It is
recommended to configure GPGGA, GPGSV, and other messages.
Figure. 4-6 NMEA Data Output
Step 4. Click the receiver settings button, configure the NMEAmessage output, and click
send. It is recommended to configure GPGGA, GPGSV, and other messages.
Step 5. In the data session window, click “Send all Message” to complete all the NMEA
message output (update rate 1Hz). Right click in the data session window to
adjust: output log font size, stop / resume log output, or clear log content, etc.
Step 6. Use various views of UPrecise to configure or input commands as required.
5. LED Indicators
Three LED indicators are installed on UB482 board to indicate the basic working status of
the board, which includes:
No
Color
Status
Instruction
Remark
1
Red
On
Power on
2
Off
Power off
3
Green
On
PV indicator, RTK FIX is enabled
4
Off
PV indicator, RTK FIX is disabled
5
Yellow
On
Single point positioning is enabled
6
Off
Single point positioning is disabled

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6. Common Commands Setup
UB4B0M supports simplifiedASCII format. SimplifiedASCII format without checksum bits
makes it easier for users to enter commands. All commands consist of a command header
and configuration parameters (if the parameter part is empty, the command has only one
header), and the header field contains the command name or message header.
UB4B0M is simple and easy to use, and the common commands are shown in the
following table:
Table 6-1 Common Commands
Command
Description
freset
Restore factory settings
version
Query version number
config
Query the serial port status of receiver
mask BDS
Mask (disable) tracking of Beidou satellite system. BDS, GPS,
GLONASS and Galileo can be disabled separately
unmask BDS
Unmask (enable) tracking of Beidou satellite system. BDS,
GPS, GLONASS and Galileo can be enabled separately.
By default, all satellite systems are tacked.
config com1 115200
Set com1 baud rate as 115200
Com1, com2 and com3 can be set respectively as any one of
9600, 19200,
38400, 57600, 115200, 230400, and 460800
unlog
Disable all output from the current serial port
saveconfig
Save settings
mode base time 60 1.5 2.5
The reference point coordinates are automatically generated 60
seconds after positioning or when the horizontal accuracy is
better than 1.5m or the elevation accuracy is better than 2.5 m.
After power off and restart, the new reference point coordinates
will be calculated and generated again.
mode base lat Lon height
Manually set the reference point coordinates as: lat, lon, height
(the coordinates do not change after the power off and restart)
e.g.
lat=40.07898324818,
lon=116.23660197714,
height=60.4265
Note:The longitude and latitude coordinates can be obtained
through the bestpos command; if it is the southern latitude, lat
value is negative; if it is the western longitude, lon value is
negative.
mode base
Set as base station
mode movingbase
Set as rover station
mode rover
Rover mode by default (The command can switch the receiver
from the base station mode to rover station mode)