UNICORECOMM UM482 User manual

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INSTALLATION AND OPERATION
USER MANUAL
Data subject to change without notice.
Communications, Inc. Copyright© 2009-2021, Unicore
All-constellation Multi-frequency
GPS/BDS/GLONASS/Galileo
U M482
High Precision Positioning and
Heading Module

i
Revision History
Version
Revision History
Date
Ver. 1.0
First release
Aug. 2017
R3.1
Revise the description of RST_N configuration and the
action execution time
Add the related description to clarify the VCC restrictions
2019-08-26
R3.2
Chapter 2.1: delete the legacy parameter and add pin
mechanical spec
Chapter 2.2: add the working current info of No.17 pin
2019-10-14
R3.3
1.2 Technical Specifications: update the weight value
from 8.8 to 9.2
1 Overview: update the product diagram
2020-02-26
R3.4
1.2 Technical Specifications: add QZSS
2020-07-01
R3.5
Update BDS frequencies in section 1.2
2020-10-21
R3.6
Add external antenna feed reference design
2020-12-17
R4
Remove information on the MEMS device and add RF
input power consumption of the antenna
2021-04-13
R4.1
Modify pin definition in Figure 2-2
2021-06-30
R4.2
Modify Figure 3-4, fix typo and correct inaccurate
expressions in chapter 5.2 and 5.3
2021-07-06
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.

UM482 User Manual
ii
Foreword
This <User Manual> offers you information on the features of the hardware, the
installation, specifications and use of the UNICORECOMM UM482 product.
For the generic version of this manual, please refer to the appropriate part of this manual
depending on your purchased product configuration - concerning CORS, RTK and Heading.
Readers it applies to
This <User Manual> is written for technologists who have knowledge of GNSS
Receivers to some extent –it is not for general readers.

i
Contents
1OVERVIEW .............................................1
1.1 KEY FEATURES ..............................................................................................................................1
1.2 TECHNICAL SPECIFICATIONS.............................................................................................................2
1.3 INTERFACES..................................................................................................................................3
2HARDWARE .............................................4
2.1 DIMENSIONS................................................................................................................................4
2.2 PIN DEFINITION (TOP VIEW)...........................................................................................................5
2.3 PIN FUNCTION .............................................................................................................................5
2.4 ELECTRICAL SPECIFICATIONS ............................................................................................................8
2.5 OPERATIONAL CONDITIONS.............................................................................................................8
2.6 PHYSICAL SPECIFICATIONS...............................................................................................................9
3HARDWARE DESIGN ......................................9
3.1 DESIGN IN CONSIDERATIONS ...........................................................................................................9
3.2 UM482 REFERENCE DESIGN ........................................................................................................10
3.3 PINS.........................................................................................................................................11
3.4 PCB PACKAGING ........................................................................................................................13
3.5 RESET SIGNAL ............................................................................................................................13
3.6 EXTERNAL ANTENNA FEED DESIGN.................................................................................................14
4INSTALLATION AND CONFIGURATION .......................15
4.1 ESD HANDLING PRECAUTIONS ......................................................................................................15
4.2 HARDWARE INSTALLATION ............................................................................................................15
4.3 POWER ON................................................................................................................................18
4.4 CONFIGURATION AND OUTPUT ......................................................................................................18
4.5 OPERATION STEPS.......................................................................................................................19
5CONFIGURATION COMMANDS...............................20
5.1 REFERENCE STATION CONFIGURATION.............................................................................................21
5.2 ROVER STATION CONFIGURATION...................................................................................................22
5.3 MOVING BASE CONFIGURATION ....................................................................................................22
5.4 HEADING CONFIGURATION ...........................................................................................................23
5.5 HEADING2 CONFIGURATION .........................................................................................................24
6ANTENNA DETECTION ...................................24
7FIRMWARE UPGRADE ....................................25
8SOLDERING RECOMMENDATION.............................26
9PACKAGING ...........................................27

1
1Overview
UM482 is the smallest, all-constellation, multi-frequency, high precision RTK and
heading module developed by Unicore Communications Inc. The module is targeted
for use in robots, UAVs and intelligent driving applications.
The UM482 provides reliable centimeter-level accuracy and a high accuracy heading
output at high update rates.
By employing a single UC4C0 (432 channel tracking) baseband chip with internal RF
front-end in a single-sided SMD package, UM482 can achieve very small size (30x40
mm). It can simultaneously track GPS L1/L2 + BDS B1I/B2I + GLONASS L1/L2+Galileo
E1/E5b+L1/L2 QZSS.
The UM482 adopts UNICORECOMM’s new-generation “UGypsophila” RTK processing
technology and takes advantage of high-performance data sharing capability and the
extremely 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 UM482 Module
1.1 Key Features
30×40 mm, small footprint multi-frequency RTK and heading module, SMD
package
Supports GPS L1/L2+BDS B1I/B2I +GLONASS L1/ L2+Galileo E1/E5b and QZSS
L1/L2
Precise RTK positioning and heading
RTK Initialization time < 5s
Dual antenna input with supporting antenna signal detection
20Hz data output rate
Adaptive recognition of RTCM input data format

UM482 User Manual
2
May also support odometer input and external high-performance IMU
interface*
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
RTK 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
30×40×4 mm
Power Consumption
2.4W (Typical)
Weight
9.2g
Table 1-2 Functional Ports
3x UART, 1xI2C, 1x SPI (LV-TTL)
1x1PPS (LV-TTL)
1x Event input
1
BDS B1I/B3I is supported with the firmware upgraded

3
1.3 Interfaces
RF In
RF
Chip
SAW
Filter
NebulasII UART
SPI
GPS
BDS
GLO
GAL
QZSS
SBAS
Interface Event
TCXO
RF In SAW
Filter
I2C
ANT1_PWR
ANT2_PWR
PPS
Figure 1-2 Block Diagram
RF Part
GNSS signals received from the antenna via a coaxial cable are filtered and enhanced.
The RF part convert the RF input signals into the IF signal, and then IF analog signals
are converted into the digital signals required for NebulasII digital processing.
NebulasII SoC (UC4C0)
The UM482 incorporates the processing from the NebulasII (UC4C0),
UNICORECOMM’s new generation high precision GNSS SoC using 55nm low power
design. It supports up to 12 digital intermediate frequencies or 8 analog intermediate
frequency signals, and can track 12 navigation signals with 432 channels.
1PPS
UM482 outputs a 1 Pulse-per-second time strobe with a corresponding time and
positioning tag. The pulse width/polarity is configurable.
Event
UM482 provides a 1 Event Mark Input with adjustable pulse width and polarity.
Reset (RST_N)/Factory Default (FRESET_N)
The reset signal RST_N should be set active low for no less than 20ms effective time.

UM482 User Manual
4
When the FRESET_N is activated, the user parameters in NVM will be cleared and the
module is restored to factory default settings. The FRESET_N is active low. Please pull
FRESET_N pin to low for more than 5s to ensure a successful reset.
2Hardware
2.1 Dimensions
Table 2-1 Dimensions
Symbol
Value (mm)
Tolerance (mm)
A
40.00
-0.2 +0.5
B
30.00
±0.2
C
4.00
±0.2
D
1.58
±0.1
E
1.27
±0.1
K
0.91
±0.1
M
1.35
±0.1
N
0.66
±0.1
Figure 2-1 UM482 Mechanical Diagram

5
2.2 Pin Definition (Top View)
The UM482 has 2x30 pins, shown below.
Figure 2-2 UM482 Pin Diagram
2.3 Pin Function
Table 2-2 Pin Descriptions
No
Pin
I/O
Description
1
GND
-
Ground
2
ANT1_IN
I
GNSS antenna signal input (primary antenna)
3
GND
-
Ground

UM482 User Manual
6
No
Pin
I/O
Description
4
GND
-
Ground
5
ANT1_PWR
I
GNSS antenna power supply (for separate heading
antennae)
6
GND
-
Ground
7
ANT_NLOD
O
Primary GNSS antenna open circuit indicator
1: normal
0: antenna is open circuit
8
ANT_FFLG
O
Primary GNSS antenna short circuit indicator
1: normal
0: antenna is short circuit
9
GND
-
Ground
10
RSV
-
RSV
11
RSV
-
RSV
12
RSV
-
RSV
13
RSV
-
RSV
14
GND
-
Ground
15
SPEED
I
odometer- pulse (reserved)
16
FWR
I
odometer- direction (reserved)
17
V_BACKUP
I
When the main power supply of the module VCC is
cut off, V_BCKP enables a separate power supply if
provisioned to RTC and SRAM. Level requirements:
2.0~ 3.6 V, and the working current is about 10uA.
Leave it open without using the hot start function
18
GND
-
Ground
19
PVT STAT
O
PVT positioning indicator, active-high. The module
outputs high level when positioning is available and
outputs low level when no positioning is proceeded.
20
GPIO2
I/O
General IO
21
RSV
-
RSV
22
FRESET_N
I
Reset to factory default (clear all user settings),
LVTTL active-low, activate for longer than 5 seconds
23
ERR_STAT
O
Abnormal indicator, active-high. When the module
self-diagnosis system fails, it outputs high level.
Following completion of successful self-test ERR-STAT
outputs low level
24
RTK_STAT
O
RTK positioning indicator, active-high. When the RTK
solution is fixed, it outputs high level, alternatively it
outputs low level when in other positioning states or
no positioning is proceeded.
25
GND
-
Ground