Sokkia GRX3 User manual

GRX3
Operator Manual
GNSS Receiver
GRX3
Operator Manual
GNSS Receiver
GRX3
Operator Manual
GNSS Receiver

GRX3
GNSS Receiver
Operator Manual
©2022, Sokkia
Part Number 1030371-01
Revision C

P/N: 1030371-01 i
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iv
Introduction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
GRX3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Unpacking Your Receiver Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Standard Kit Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Technical Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Using Sokkia Software With Your Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Getting Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Website . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Getting Acquainted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Receiver Enclosure—Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Receiver Enclosure—Display Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Receiver Enclosure—SIM Card Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Receiver Enclosure — GRX3 Hardware Reset Button . . . . . . . . . . . . . . . . . . . . 2-4
Receiver Enclosure—Bottom Overview Labels. . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
External Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Receiver Enclosure Top—Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Receiver Enclosure Bottom—Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Display Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Power Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
LED Display Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Receiver Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Status LED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Recording LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Communication LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Bluetooth LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Cellular LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Radio LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Battery LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Managing Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Turning the Receiver On/Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Table of Contents

Table of Contents
ii P/N: 1030371-01
Powering the Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Operating Hours . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Charging the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Battery Charging Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Surveying While Charging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Using an External Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Insufficient Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Installing Sokkia Receiver Utility (SRU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Loading New Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Option Authorization Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Checking the Receiver’s OAF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Loading an OAF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Performing a Factory Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Perform a Factory Reset Using SRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Perform a Factory Reset Using the LED Display . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
Using TILT Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
HIMU Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
System Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Setting Up the Base Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Setting Up the Rover Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Using GRX3 with External Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Measuring Antenna Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Collecting Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Setting Recording Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Logging Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Recording Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Recording Data via the LED Display Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Recording Data Using Sokkia Receiver Utility (SRU). . . . . . . . . . . . . . . . . . . . . . 7-2
Managing Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
USB Connection Specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
Downloading Data Files Using SRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
Deleting Data Files from the Receiver Memory Using SRU. . . . . . . . . . . . . . . . . 7-11
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Check This First . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Powering Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Receiver Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

Table of Contents
iii
P/N: 1030371-01
Bluetooth Problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
SRU Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
Cleaning and Storing the Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
Getting Customer Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1
General Details. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
R2 Lite UHF Internal Modem Board Details (Optional) . . . . . . . . . . . . . . . . . . . . 9-7
General Recommendation for Highly Reliable Radio Links. . . . . . . . . . . . . . . . . 9-7
Bluetooth Module Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-8
Connector Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-8
Radio (Modem) RF Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-9
Cellular Module RF Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-9
Power Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-9
Serial RS-232 Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10
Micro-USB Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-11
Product Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1
Safety Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-1
General Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
Battery Pack Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
Receiver Warnings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2
Usage Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2
Regulatory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-1
FCC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
ISED Canada Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
Community of Europe Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-2
European Community Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . 12-2
Restrictions on Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-2
Product Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-2
Declaration of Conformity
(Radio Equipment Directive 2014/53/EU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-3
WEEE Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-4
Japan Bluetooth SiteComm Module Compliance . . . . . . . . . . . . . . . . . . . . . . . . 12-4
Bluetooth Transmission Statements/Compliance . . . . . . . . . . . . . . . . . . . . . . . . 12-5
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-1

P/N: 1030371-01 iv
Preface
Thank you for purchasing this Sokkia product. The materials available in this Manual (the “Manual”)
have been prepared by Topcon Positioning Systems, Inc. (“TPS”) for owners of Sokkia products and
are designed to assist owners with the use of the receiver and its use is subject to these terms and
conditions (the “Terms and Conditions”).
Terms and Conditions
Use
This product is designed to be used by a professional. The user should have a good knowledge of the
safe use of the product and implement the types of safety procedures recommended by the local
government protection agency for both private use and commercial job sites.
Copyrights
All information contained in this Manual is the intellectual property of and copyrighted material of TPS.
All rights are reserved. Do not use, access, copy, store, display, create derivative works of, sell, modify,
publish, distribute or allow any third party access to, any graphics, content, information or data in this
Manual without TPS’ express written consent and may only use such information for the care and
operation of the receiver. The information and data in this Manual are a valuable asset of TPS and are
developed by the expenditure of considerable work, time and money and are the result of original
selection, coordination and arrangement by TPS.
Trademarks
Sokkia®, Sokkia® GNSS Receiver, GeoPro, Topcon Integrated Leveling TechnologyTM (TILT), Fence
Antenna® technology, Vanguard TechnologyTM, SiteComm, Quartz Lock LoopTM TopNET®,
MAGNET® Field, Topcon® and Topcon Positioning SystemsTM are trademarks or registered
trademarks of TPS. Windows® is a registered trademark of Microsoft Corporation. The Bluetooth®
word mark and logos are owned by Bluetooth SIG, Inc. and any use of such marks by Topcon
Positioning Systems, Inc. is used under license. Other product and company names mentioned herein
may be trademarks of their respective owners.
Disclaimer of Warranty
EXCEPT FOR ANY WARRANTIES IN AN APPENDIX OR A WARRANTY CARD ACCOMPANYING THE
PRODUCT, THIS MANUAL AND THE RECEIVER ARE PROVIDED “AS-IS.” THERE ARE NO OTHER
WARRANTIES. TPS DISCLAIMS ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR USE OR PURPOSE. TPS AND ITS DISTRIBUTORS SHALL NOT BE LIABLE
FOR TECHNICAL OR EDITORIAL ERRORS OR OMISSIONS CONTAINED HEREIN; NOR FOR
INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM THE FURNISHING,
PERFORMANCE OR USE OF THIS MATERIAL OR THE RECEIVER. SUCH DISCLAIMED DAMAGES
INCLUDE BUT ARE NOT LIMITED TO LOSS OF TIME, LOSS OR DESTRUCTION OF DATA, LOSS OF
PROFIT, SAVINGS OR REVENUE, OR LOSS OF THE PRODUCT’S USE. IN ADDITION TPS IS NOT
RESPONSIBLE OR LIABLE FOR DAMAGES OR COSTS INCURRED IN CONNECTION WITH
OBTAINING SUBSTITUTE PRODUCTS OR SOFTWARE, CLAIMS BY OTHERS, INCONVENIENCE, OR
NOTICE
Please read the terms and conditions carefully.

Preface
vP/N: 1030371-01
ANY OTHER COSTS. IN ANY EVENT, TPS SHALL HAVE NO LIABILITY FOR DAMAGES OR
OTHERWISE TO YOU OR ANY OTHER PERSON OR ENTITY IN EXCESS OF THE PURCHASE PRICE
FOR THE RECEIVER.
License Agreement
Use of any computer programs or software supplied by TPS or downloaded from a TPS website (the
“Software”) in connection with the receiver constitutes acceptance of these Terms and Conditions in
this Manual and an agreement to abide by these Terms and Conditions. The user is granted a
personal, non-exclusive, non-transferable license to use such Software under the terms stated herein
and in any case only with a single receiver or single computer. You may not assign or transfer the
Software or this license without the express written consent of TPS. This license is effective until
terminated. You may terminate the license at any time by destroying the Software and Manual. TPS
may terminate the license if you fail to comply with any of the Terms or Conditions. You agree to
destroy the Software and manual upon termination of the use of the receiver. All ownership, copyright
and other intellectual property rights in and to the Software belong to TPS. If these license terms are
not acceptable, return any unused software and manual.
Website; Other Statements
No statement contained at the TPS website (or any other website) or in any other advertisements or
TPS literature or made by an employee or independent contractor of TPS modifies these Terms and
Conditions (including the Software license, warranty and limitation of liability).
Technical Documentation and Utility Software
On the Sokkia Support website (https://us.sokkia.com/sokkia-care-products/sru-sokkia-receiver-
utility), you can download technical documentation, training material, and various utility software to
help you set up and use your Sokkia product. The website also offers registration resources, training,
and technical assistance.
Although the support documentation, firmware and utility software for the Sokkia GRX3 can be found
at the Sokkia Care site, the product registration is done via the myTopcon site/or by using the
myTopcon NOW! app. It is free to create an account and register.
Safety
Improper use of the receiver can lead to injury to persons or property and/or malfunction of the
product. The receiver should only be repaired by authorized TPS warranty service centers.
Miscellaneous
The above Terms and Conditions may be amended, modified, superseded or canceled, at any time
by TPS. The above Terms and Conditions will be governed by and construed in accordance with, the
laws of the State of California, without reference to conflict of laws.

Preface
vi
P/N: 1030371-01
Manual Conventions
This manual uses the following conventions:
Convention Description Example
Bold Menu or drop-down menu selection File > Exit (Click the File menu and click
Exit)
Name of a dialog box or screen From the Connection screen...
Button or key commands Click Finish.
Mono User supplied text or variable Type guest and click Enter.
Italic
Reference to another manual or help document Refer to the Sokkia Reference Manual .
NOTE
Further information to note about system configuration, maintenance or setup.
NOTICE
Supplementary information that can have an adverse affect on system operation,
system performance, data integrity or measurements.
CAUTION
Notification that an action has the potential to result in minor personal injury,
system damage, loss of data or loss of warranty.
WARNING
Notification that an action has the potential to result in personal injury or property
damage.
DANGER
Notification that an action has the potential to result in severe personal injury or
death.

P/N: 1030371-01 1-1
Introduction
The Sokkia GRX3 GNSS receiver is a compact, high-performing integrated GNSS receiver for static
and kinematic land surveying applications. The receiver design includes 226 GNSS channel Vanguard
Technology with Universal Tracking Channels and advanced integrated Fence Antenna technology.
These technologies deliver world class positioning and navigation capability to your application by
tracking signals with multiple frequencies and multi-constellation satellite systems such as GPS,
GLONASS, BeiDou, QZSS, Galileo, NavIC, and SBAS.
To create a future proof, efficient positioning system this receiver combines; GNSS tracking
capabilities, multiple-frequency RTK, DGPS and PPP solutions, extensive communication capabilities,
a built-in 8 GB memory and an integrated internal battery.
Several unique features, including advanced multi-path mitigation, adjustable Phase Locked Loop
(PLL) and Delay Locked Loop (DLL), offer reliable and versatile reception of weak signals even in
degraded signal environments. The receiver also supports Quartz Lock Loop (QLL) technology for
superior GNSS tracking in high-vibration environments.
The GRX3 receiver contains an internal HIMU (Hybrid Inertial Measurement Unit) module. This module
measures tilt angles of the rover receiver. The angle values are used by the software application
MAGNET Field for calculating the true projection of the rover antenna phase center on the ground.
The GRX3 GNSS Receiver offers complete IP67 protection against dust and water ingress, in addition
to superior vibration and shock resistance. The Sokkia communication interface allows you to integrate
GNSS performance and quickly deliver world class positioning and navigation support to your
applications.
Figure 1-1: GRX3 Receiver

Introduction
GRX3 Features 1-2
P/N: 1030371-01
GRX3 Features
The GRX3 GNSS receiver’s advanced design provides simplified setup and maximum performance.
The GRX3 receiver features are as follows:
●226 GNSS channel Vanguard Technology with Universal Tracking Channels for multi-frequency
tracking of multiple satellite constellations such as GPS, GLONASS, BeiDou, QZSS, Galileo,
NavIC, and SBAS.
●Industry leading Fence Antenna technology
●Internal, non-removable battery
●Internal UHF radio modem
●Optional Multi-band 4G/3G/2G internal cellular module
●Integrated Bluetooth, multi-channel SiteComm technology
●Interface for controlling and viewing data logging through the LED display
●Topnet Live Starpoint (Pro) global Precise Point Positioning (PPP) correction service
●TILT—Topcon Integrated Leveling Technology
●External power, USB and serial-data ports
●External GNSS antenna connector for GRX3 series receivers without an internal cellular module
●External cellular module antenna connector for GRX3 series receivers with an internal cellular
module
●Internal 8 GB memory storage
●Virtual serial port via USB
●Data access using USB
The GRX3 comes in one of the following configurations:
●No cellular module
●Integrated 4G/LTE cellular module only
●R2 Lite UHF radio, with integrated 4G/LTE cellular module
●Alinco UHF radio (available in Japan)
●Alinco UHF radio (available in Japan), with integrated 4G/LTE cellular module