UNICORECOMM UB482 User manual

WWW.UNICORECOMM.COM
INSTALLATION AND OPERATION
USER MANUAL
Data subject to change without notice.
Communications, Inc.
GPS/BDS/GLONASS/Galileo
UB 482
High Precision and Heading Board
All-constellation Multi-frequency
Copyright© 2009-2021, Unicore

i
Revision History
Version
Revision History
Date
Ver. 1.0
First release
Aug. 2017
R3.1
Add the related description to clarify the VCC restrictions
2019-08-28
R3.2
Chapter 2.1: revise the mechanical dimensions of fields and the
RF connector
Chapter 2.2: pin 12 and pin 24 are reserved
2019-10-14
R3.3
Update product diagram and Copyright time
2020-04-08
R3.4
1.2 Technical Spec: add QZSS
2.4 Electrical Specifications: revise the values of VCC/Vin_low_1
/Vin_high_1/Vout_low /Vout_high
2020-07-01
R3.5
Update BDS frequencies
2020-10-23
R4
Revise the description of pin4
Add RF input power consumption of antennas
Remove information on the MEMS device
2021-04-01
Disclaimer
Information in this document is subject to change without notice and does not
represent a commitment on the part of Unicore Communications, Inc. No part of this
manual may be reproduced or transmitted in any form or by any means, electronic
or mechanical, including photocopying and recording, for any purpose without the
express written permission of a duly authorized representative of Unicore
Communications, Inc. The information contained within this manual is believed to be
true and correct at the time of publication.
© Copyright 2009-2021 Unicore Communications, Inc. All rights RSV.

UB482 User Manual
ii
Foreword
This <User Manual> provides information in the features of the hardware, the
installation, specification and use of UNICORECOMM UB482 product.
For the genericversion of this manual, please refer to the appropriate part of the manual according
to your purchased product configuration, concerning CORS, RTK and Heading.
Readers it applies to
This <User Manual> is applied to the technicists who know GNSS Receiver to some
extent but not to the general readers.

i
Content
1OVERVIEW ............................................1
1.1 KEY FEATURES ..............................................................................................................................2
1.2 TECHNICAL SPECIFICATIONS.............................................................................................................3
1.3 BOARD OVERVIEW ........................................................................................................................4
2HARDWARE ...........................................5
2.1 DIMENSIONS................................................................................................................................5
2.2 CONNECTOR AND PIN DEFINITION....................................................................................................6
2.3 PINS FUNCTION DESCRIPTION .........................................................................................................7
2.4 ELECTRICAL SPECIFICATIONS ............................................................................................................8
2.5 OPERATION CONDITION .................................................................................................................8
2.6 PHYSICAL SPECIFICATIONS...............................................................................................................9
3HARDWARE DESIGN .....................................9
3.1 DESIGN IN CONSIDERATIONS ...........................................................................................................9
3.2 UB482 REFERENCE DESIGN .........................................................................................................10
3.3 PINS.........................................................................................................................................10
3.4 ANTENNA..................................................................................................................................11
4INSTALLATION AND CONFIGURATION ......................12
4.1 ESD HANDLING PRECAUTIONS ......................................................................................................12
4.2 INSTALLATION GUIDE ...................................................................................................................12
4.3 POWER ON................................................................................................................................14
4.4 CONFIGURATION AND OUTPUT ......................................................................................................14
4.4.1 OPERATION STEPS...................................................................................................................15
5LED INDICATORS.......................................16
6CONFIGURATION COMMANDS............................17
6.1 REFERENCE STATION CONFIGURATION.............................................................................................19
6.2 MOVING BASE CONFIGURATIONS...................................................................................................20
6.3 RTK ROVER CONFIGURATION........................................................................................................20
6.4 HEADING CONFIGURATION ...........................................................................................................20
6.5 HEADING2 CONFIGURATION .........................................................................................................21
7FIRMWARE UPGRADE...................................21
8PACKAGING...........................................23

1
1Overview
UB482 is a classic compact high-precision board developed by Unicore
Communications, Inc., targeting precision agriculture, robots and intelligent driving
applications. It supports all-constellation multi-frequency RTK and heading function.
The UB482 provides reliable centimeter-level accuracy and high accuracy heading
output at high update rate.
By employing a single UC4C0 (432 channel tracking) baseband chip and a single RF
chip, using single-sided SMD packaging, UB482 has achieved very small size
(30x40mm). It can simultaneously track GPS L1/L2 + BDS B1I/B2I + GLONASS
L1/L2+Galileo E1/E5b+QZSS.
The UB482 adopts UNICORECOMM’s new-generation “UGypsophila” RTK processing
technology and takes advantage of high-performance data sharing capability and
super-simplified operating system within the NebulasII GNSS SoC chip. It uses
optimized multi-dimensional RTK matrix pipeline computation, resulting in much
higher RTK processing capability.
Figure 1-1 UB482 Board

UB482 User Manual
2
1.1 Key Features
➢All-constellation multi-frequency high-precision RTK and heading board, support
BDS B1I/B2I + GPSL1/L2+GLONASS L1/L2+Galileo E1/E5b+QZSS L1/L2
➢46x71mm classic compact board
➢Precise RTK positioning and heading
➢Fast RTK Initialization time < 5s
➢20Hz data output rate
➢Adaptive recognition of RTCM input data format
➢Support LAN
➢Support odometer input and external high-performance IMU interface*

3
1.2 Technical Specifications
Table 1-1 Performance Specifications
Channels
432 channels, based on
NebulasII SoC chip
Cold Start
＜25s
Frequency
GPS L1/L2
BDS B1I/B2I1
GLONASS L1/L2
Galileo E1/E5b
QZSS L1/L2
Initialization
Time
＜5s (Typical)
Single Point
Positioning
(RMS)
Horizontal: 1.5m
Vertical: 2.5m
Initialization
Reliability
＞99.9%
DGPS (RMS)
Horizontal: 0.4m
Vertical: 0.8m
Differential Data
RTCM 3.0/3.2/3.3
Data Formats
NMEA-0183,
Unicore binary
RTK (RMS)
Horizontal: 1cm+1ppm
Vertical: 1.5cm+1ppm
Update Rate
20Hz
Time Accuracy
(RMS)
20ns
Heading
Accuracy (RMS)
0.2 degree/1m baseline
Data Accuracy
(RMS)
0.03m/s
Size
46x71x10mm
Power
Consumption
2.4W (Typical)
Functional Ports
3x UART, 1xI2C, 1x SPI (LV-TTL)
1x LAN
1x Event input
1x1PPS (LV-TTL)
1
B1I/B3I is supported with the firmware upgraded

UB482 User Manual
4
1.3 Board Overview
RF In
RF
Chip
SAW
Filter
Nebulas-II UART
SPI
GPS
BDS
GLO
GAL
QZSS
SBAS
Interface Event
TCXO
RF In SAW
Filter
I2C
ANT1_PWR
ANT2_PWR
PPS
LAN
Figure 1-2 UB482 Block Diagram
⚫RF Part
The receiver gets filtered and enhanced GNSS signal from the antenna via a coaxial
cable. The RF part converts the RF input signals into the IF signal, and converts IF
analog signal into digital signals required for NebulasII (UC4C0) digital processing.
⚫NebulasII SoC (UC4C0）Processing Incorporated
The UB482 incorporates the processing from the NebulasII (UC4C0),
UNICORECOMM’s new generation high precision GNSS SoC with 55nm low power
design, which supports up to 12 digital intermediate frequency or 8 analog
intermediate frequency signals and can track 12 navigation signals with 432
channels.
⚫1PPS
UB482 outputs 1 Pulse-per-second time strobe with corresponding time and
positioning tag. The pulse width/polarity is configurable.
⚫Event
UB482 provides 1 Event Mark Input with adjustable pulse width and polarity.

5
⚫Reset (RESETIN_N)/Factory Default (FRESET_N)
The reset signal RST_N should be set active low, no less than 5ms effective time.
When the FRESETN_N is activated, the user parameter in NVM will be cleared and
the board is restored to factory default settings. The FRESET_N is active low. Please
pull FRESET_N pin to low level for more than 5s to ensure successful reset.
2Hardware
2.1 Dimensions
Table 2-1 Dimensions
Parameter
Value
Tolerance
Length
71.1mm
-0.2mm +0.5mm
Width
45.7mm
±0.2mm
Height (PCB)
1.6mm
±10%
RF Connector
4.5mm
±0.2mm
Shield
2.0mm
±0.2mm
Pin Distance
5.9mm
±0.2mm
Pin 1
Pin 28
ANT2
ANT1
Figure 2-1 UB482 Profile

UB482 User Manual
6
Figure 2-2 UB482 Mechanical Diagram
ANT1 is the primary antenna (positioning) and ANT2 is the secondary antenna
(heading). The antenna is MMCX connector. When working as a base station, only
ANT1 should be connected. When working as a rover, the direction output is the
result of the anticlockwise angle between the vector (starting from ANT1, ending at
ANT2) and True North.
2.2 Connector and Pin Definition
There are two dual rows of pin headers on UB482: 2x14 dual row, 2.0mm pitch
Figure 2-3 UB482 Pins Definition
_______________________________________________________________________________
Note: The model number of the dual row pin header (28pin male) on the UB482 board
is: CH71283V100 from CviLux. It’s recommended to mate with the Molex's plug-in socket
(28Pin female), of which the model number is: 79107-7013.
_______________________________________________________________________________
_
5.6
.0

7
2.3 Pins Function Description
Table 2-2 Pins Function
Pin
Signal
I/O
Description
Notes
1
SPI_MOSI
O
SPI data
Master output, Slave input
2
SPI_CS
O
SPI chip select
3
SPI_CLK
O
SPI clock
4
TPO_MID
O
Ethernet transformer center
tap
Connect Center Tap
5
RSV
-
Reserved
6
VCC
Power
Power input
3.3V~5VDC
7
SPI_MISO
I
SPI data
Master input, Slave output
8
RXD3
I
COM3 input data reception
LVTTL
9
RESETIN_N
I
Reset input
LVTTL, low active (>5ms)
10
FRESET_N
I
Restore to factory default
setting (user configuration will
be reset)
LVTTL, low active (> 5s)
11
EVENT
I
Event input
LVTTL
12
RSV
-
Reserved
13
TXD3
O
COM3 output transmit data
LVTTL
14
GND
Power
15
TXD1
O
COM1 output transmit data
LVTTL
16
RXD1
I
COM1 input data reception
LVTTL
17
GND
Power
18
TXD2/SDA
O
COM2 output transmit data
/or I2C SDA
LVTTL
19
RXD2/SCL
I
COM2 input data reception
/or I2C SCL
LVTTL
20
GND
Power
21
PV
O
Position valid
High effective (RTK fix is
effective when UB482 works
as the rover; When UB482
works as the base station,
successful set up of the base
station and GPGGA status bit
at “7” will make the pin
effective). If LED indicator is
needed, lead the pin to the
anode of the LED diode.
22
GND
Power

UB482 User Manual
8
Pin
Signal
I/O
Description
Notes
23
PPS
O
Pulse per second
24
RSV
-
Reserved
25
TPO+
O
Positive electrode of Ethernet
sending data, Differential pair.
Connect to TD+
26
TPI+
I
Positive electrode of Ethernet
receiving data, Differential
pair
Connect to RD+
27
TPO-
O
Negative electrode of
Ethernet sending data,
Differential pair
Connect to TD-
28
TPI-
I
Negative electrode of
Ethernet receiving data,
Differential pair
Connect to RD-
2.4 Electrical Specifications
Table 2-3 Absolute Maximum Rating
Item
Pin
Min
Max
Unit
Power Supply (VCC)
Vcc
-0.3
5.5
V
Voltage Input
Vin
-0.3
3.6
V
VCC Ripple (Rated Max.)
Vrpp
0
50
mV
Voltage Input (pins other than RXD1,
RXD2, RXD3)
Vin
-0.3
3.6
V
RF Input Power Consumption of
master antenna
ANT1_IN input power
+15
dBm
RF Input Power Consumption of
slave antenna
ANT2_IN input power
+15
dBm
Maximum ESD stress
VESD (HBM)
±2000
V
2.5 Operational Conditions
Table 2-4 Operational Conditions
Item
Pin
Min
Typical
Max
Unit
Condition
Power Supply (VCC)
Vcc
3.3
3.3
5.0
V
Inrush Current2
Iccp
10
A
Vcc = 3.3 V
LOW Level Input Voltage
Vin_low_1
-0.3
0.9
V
High Level Input Voltage
Vin_high_1
2.4
3.6
V
2
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.

9
Item
Pin
Min
Typical
Max
Unit
Condition
LOW Level Output Voltage
Vout_low
0
0.45
V
Iout= 4 mA
High Level Output Voltage
Vout_high
2.85
3.3
V
Iout =4 mA
Antenna Gain
Gant
20
36
dB
Power Consumption
P
2.3
2.6
W
2.6 Physical Specifications
Table 2-5 Physical Specifications
Temperature
Operating: -40℃～+85℃
Storage: -55℃～+95℃
Humidity
95% No condensation
Vibration
GJB150.16-2009, MIL-STD-810
Shock
GJB150.18-2009, MIL-STD-810
3Hardware Design
3.1 Design in Considerations
⚫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
⚫ANT1 and ANT2 MMCX interfaces supply DC 4.8~5.4 V feed in no-load
condition, and supply DC 4.6V±0.2V feed when the working circuit is
tested 30~100mA in room temperature. Fifty (50) ohm impedance
matching for ANT1 and ANT2 is strongly recommended
⚫Supply stable power to the VCC pin. Connect all the GND pins to ground
⚫Ensure COM1 is connected to the host. COM1 is required for firmware
upgrades.
⚫FRESET_N resets the factory settings for the board. RESETIN is fast reset;
please ensure the board is connected correctly to reset the board.
In order to obtain proper performance, special concerns should be paid during the
design to the following:
⚫Power supply: A stable and low ripple power supply is necessary for good
performance. Make sure the peak to peak voltage ripple does not exceed
50mVpp. It is recommended to use a power chip with current output
capacity greater than 2A to power the board.
−Use LDO to ensure the purity of the power supply
−Try to place LDO close to the module in layout
−Widen the tracks of power circuit or use copper pour surface to
transmit current

UB482 User Manual
10
−Avoid walking through any high-power or high inductance devices
such as a magnetic coil
⚫Interfaces: Ensure that the signals and baud rate of the main equipment
match those of the UB482 board
⚫Antenna interface: Make sure the antenna impedance matches, and the
cable is short without any kinks, try to avoid acute angles
⚫Try to avoid designing in any circuits underneath UB482
⚫Keep the board away from any high temperature air flow as far as
possible
3.2 UB482 Reference Design
The reference design of UB482 LAN is as follow:
Figure 3-1 UB482 LAN Reference Design
Note:
R2, R4, R6 and R7 are reserved for impedance matching. Generally, no soldering is required.
3.3 Pins
Pin/Connector
I/O
Description
Notes
Power
Supply
VCC
power
Voltage Supply
Stable, clean low ripple power supply,
peak ripple power lower than 50mVpp is
preferred
ANT1/ANT2
MMCX
power
Antenna
Power Supply
Voltage supply for active antenna. When
the antenna interface of the module
connects no antennas, the voltage tested
by multimeter is DC 4.8~5.4 V; When the
RF interface of the module connects an
antenna and the working circuit is tested
as 30~100 mA under room temperature,
R10
R30
R50
J1 HR911105A
M4 M4
M1 M1
M2 M2
M3 M3
TD+
1
CT2
4
TD-
2
RX+
3CT1
5RX-
6LEDG+ 9
LEDG- 10
LEDY+ 12
LEDY- 11
N.C 7
CHS_GND 8
C1
10 nF
R6NC
R7NC
C2
100nF
R2NC
R4NC
GND
GND
GND
TPO_MID
TPO_MID
GND
GND
TPO-
TPI-
TPO+
TPI+

11
Pin/Connector
I/O
Description
Notes
the voltage is DC 4.6V±0.2V
GND
power
Ground
Connect all the GND signals to ground.
Better to use copper pour surface.
UART
TXD1
O
COM1
Transmit Data
COM1 output, leave unconnected if not
used
RXD1
I
COM1 Receive
Data
COM1 input, leave unconnected if not
used
TXD2
O
COM2
Transmit Data
COM2 output, leave unconnected if not
used
RXD2
I
COM2 Receive
Data
COM2 input, leave unconnected if not
used
TXD3
O
COM3
Transmit Data
COM3 output, leave unconnected if not
used
RXD3
I
COM3 Receive
Data
COM3 input, leave unconnected if not
used
System
FRESET_N
I
Hardware
Reset
FRESET_N requires more than 5s to reset
the board to factory default.
Don’t connect it if not used
RESETIN_N
I
Hardware
Reset
External reset signal, low active, keep
that more than 5ms. Don’t connect it if
not used
3.4 Antenna
The ANT1 and ANT2 MMCX are connected to active antennas directly and supply
feed for the antennas. When the antenna interfaces of ANT1 and ANT2 connect no
antennas, which means there is no load, the voltage tested by multimeter is DC
4.8~5.4 V; When the RF interface of the module connects an antenna and the
working circuit is tested as 30~100 mA in room temperature, the voltage is DC
4.6V±0.2V. Fifty (50) ohm impedance matching for ANT1 and ANT2 is strongly
recommended when the active antenna is connected.
ANT1
UB482
Figure 3-2 UB482 Antenna Connection Diagram

UB482 User Manual
12
4Installation and Configuration
4.1 ESD Handling Precautions
UB482 Board is an ESD sensitive device and special precautions when handling are
required.
⚫Electrostatic discharge may cause damages to the device. All operations
mentioned in this chapter should be carried out on an antistatic workbench,
wearing an antistatic wrist strap and using a conductive foam pad
⚫Hold the edge of the board, and do NOT directly touch the electronic
components
4.2 Installation Guide
The user may assemble UB482 flexibly according to application scenarios and market
needs. The following figure shows a typical installation of the UB482 using the
Evaluation Kit (EVK).
Figure 4-1 UB482 Typical Installation Diagram
Please inspect the shipping cartons for any signs of damage or mishandling before
unpacking the UB482 package. The following items are required to install the UB482
board correctly:
1. UB482 EVK suite (or evaluation board)
2. User manual
3. UPrecise software
4. Qualified antenna
5. MMCX antenna cable
6. A PC or Laptop with serial ports (Win7 and above), with UPrecise installed

13
Follow the steps below to install:
➢Step 1: Fix UB482 board on the EVK with the holes and pins accurately.
➢Step 2: Choose the correct location for the antenna—this is critical for a high-
quality installation. Poor or incorrect placement of the antenna can influence
accuracy and reliability and may result in damage during normal operation. Use
the coaxial radio frequency cable to connect the antenna connector of UB482
EVK;
ANT1
ANT2
Figure 4-2 UB482 Antenna Connection
Note:
The RF connector on the card is MMCX, and the suitable connecting wire should be selected
according to the package. The input signal gain at the antenna interface is optimally
between 20 and 36dB. Please select the appropriate antenna, antenna cable and online LNA
accordingly.
➢Step 3: Connect the PC to the EVK serial port through direct serial cable;
➢Step 4: Connect a 12V adapter to the EVK power input, and switch on the EVK;
Figure 4-3 UB482 Serial Port, Power Connection

UB482 User Manual
14
➢Step 5: Open the UPrecise software on the PC;
➢Step 6: Configure the receiver through UPrecise software to send commands or
to log data.
4.3 Power On
UB482 power supply voltage is 3.3V. After power-on, the receiver starts and can
establish communication quickly.
4.4 Configuration and Output
UNICORECOMM UPrecise software provides a graphical interface to control and
display the operation of the receiver. The features of UPrecise software include:
⚫Connecting and configuration of the receiver
⚫Constellation View: Graphic window to display Position of satellite, PRN, and
Signal/Noise Ratio
⚫Trajectory View: The trajectory view for displaying the present point and the
past point of the Receiver
⚫Logging Control View: Graphic interface for data logging
⚫Console View: Console window for sending command to the receiver
⚫Upgrading the firmware
⚫TTFF test

15
Figure 4-4 UPrecise Views
4.4.1 Operation Steps
1) Turn on the EVK. Click “file - > connect”. Set the baud rate: the default baud rate
is 115200 bps
Figure 4-5 Connect the Serial Port
2) Click the “receiver settings”button to configure the NMEA message output
3) Click “send” button. It is recommended to configure GPGGA, GPGSV, and other
messages. Or in the dialog window, click on "Send all Message" to complete all
the NMEA message output (default update rate 1Hz).
4) In the data session window right click to adjust output log font size, to stop /
resume log output, or to clear log content
5) Configure or type commands using the UPrecise view.

UB482 User Manual
16
Figure 4-6 NMEA Data Output
5LED Indicators
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
Valid of RTK fix when UB482 works as the rover
4
Off
Invalid of RTK fix when UB482 works as the rover
The LED indicators are shown in the following figure: