Topcon Net-G3 Operator's Manual
  1. Manuals
  2. Brands
  3. Topcon Manuals
  4. Receiver
  5. Net-G3
  6. Operator's manual

Topcon Net-G3 Operator's Manual

Reference station gnss receiver
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the Net-G3 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Topcon Net-G3

Summary of Contents for Topcon Net-G3

  • Page 3 Rev A ©Copyright Topcon Positioning Systems, Inc. May, 2009 All contents in this manual are copyrighted by Topcon. All rights reserved. The information contained herein may not be used, accessed, copied, stored, displayed, sold, modified, published, or distributed, or otherwise reproduced without express written consent from Topcon.
  • Page 4 ECO#3568...

  • Page 5: Table Of Contents

    Consider the Net-G3A Reference Station Application ..........2-2 Perform a Site Inspection for the Net-G3A Reference Station ........2-3 Installing Topcon Software ..........2-5 Installing PC-CDU ............ 2-6 Installing FLoader ............. 2-7 Installing the CF Card ............2-8 Installing the USB Mass Storage Device (UMS) .... 2-9 Formatting the UMS Device ........
  • Page 6 Table of Contents Connecting and Activating the UMS Device .... 2-10 Powering the Receiver ............. 2-11 Checking Power Status ..........2-12 Turning On/Off the Receiver ........2-13 Charging the Backup Batteries ......... 2-13 Collecting Almanacs and Ephemerides ......2-14 Connecting the Receiver and a Computer ......2-15 Establishing an RS232 Cable Connection ....
  • Page 7 Table of Contents Downloading Data Files from a Removed Memory Card 4-7 Deleting Data Files from an Installed Memory Card ..4-8 Managing Receiver Memory ........... 4-10 Initializing File System ............ 4-12 Setting Raw Data & Position Update Rates to 50 Hz ..4-13 Managing Receiver Options ..........
  • Page 8 Table of Contents GPS Antenna Connector ..........A-12 1PPS Connector ............A-13 Event Marker Connector ..........A-13 External Frequency Connector ........A-14 CF Cards Compatible with the Net-G3A ......A-15 Appendix B Safety Warnings ........... B-1 General Warnings ............. B-1 Usage Warnings ...............
  • Page 9 Terms and Conditions Preface Thank you for purchasing this Topcon product. The materials available in this Manual (the “Manual”) have been prepared by Topcon Positioning Systems, Inc. (“TPS”) for owners of Topcon products and are designed to assist owners with the use of the product, and its use is subject to these terms and conditions (the “Terms and Conditions”).
  • Page 10 Preface 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. EXCEPT FOR ANY DISCLAIMER OF WARRANTY WARRANTIES IN AN APPENDIX OR A WARRANTY CARD ACCOMPANYING THE PRODUCT, THIS MANUAL AND THE RECEIVER ARE PROVIDED “AS-IS.”...
  • Page 11 Terms and Conditions comply with any of the Terms or Conditions. You agree to destroy the Software and Manual upon termination of your use of the product. 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.
  • Page 12 Preface Manual Conventions This manual uses the following conventions: Example Description File Exit Click the File menu and click Exit. Connection Indicates the name of a dialog box or screen. Frequency Indicates a field on a dialog box or screen, or a tab within a dialog box or screen.

  • Page 13: Chapter 1 Introduction

    The receiver provides the functionality, accuracy, availability, and integrity needed for fast and easy data collection and management. 1. Contact Topcon Technical Support for detailed information about the supported GALILEO signals. P/N 7010-0935...

  • Page 14: Principles Of Operation

    Introduction S TA R E C L IN R X /T Figure 1-1. Net-G3A Receiver Principles of Operation Whether based on a single reference station or a network of reference stations, static and mobile applications that use GNSS data from a high performance reference station benefit from the highest possible levels of accuracy and precision.

  • Page 15: Calculating Absolute Positions

    Principles of Operation • GLONASS – the Global Navigation Satellite System maintained and operated by the Russian Federation Ministry of Defense. For information on the status of this system, visit the Coordinational Scientific Information Center website. • GALILEO – an upcoming global positioning system maintained and operated by Galileo Industries, a joint venture of several European space agencies/companies working closely with the European Space Agency.

  • Page 16: Calculating Differential Positions

    Introduction the minimum number of satellites needed to compute a position is four. In a mixed satellite scenario (GPS, GLONASS, GALILEO), the receiver must lock on to five or more satellites to account for the different time scales used in these systems and to obtain an absolute position.

  • Page 17: Essential Components For Quality Surveying

    Principles of Operation Later, the data is downloaded to a computer, combined, and processed. Using this technique, the spatially correlated errors—such as satellite orbital errors, ionospheric errors, and tropospheric errors—can be significantly reduced, thus improving the position solution accuracy. A number of differential positioning implementations exist, including post-processing surveying, real-time kinematic surveying, maritime radio beacons, geostationary satellites (as with the OmniSTAR service), and Satellite Based Augmentation Systems (WAAS,...

  • Page 18: Receiver Overview

    Introduction • Availability – The availability of satellites affects the calculation of valid positions. The more visible satellites available, the more valid and accurate the position. Natural and man-made objects can block, interrupt and distort signals, lowering the number of available satellites and adversely affecting signal reception.
  • Page 19 Principles of Operation Also, broadcast navigation data are retrieved from the navigation frame. After the receiver locks on to four or more satellites, its absolute position in WGS-84 and the time offset between the receiver clock and GPS time are computed. This information and the measurement data can be stored in the optional Compact Flash card or the USB mass storage device (UMS) and downloaded later onto a computer, then processed using a post-processing software package.

  • Page 20: Getting Acquainted

    See “Option Authorization File (OAF)” on page 1-21 for details. The standard Net-G3A kit includes the Net-G3A, a set of cables, power supply, Topcon GPS+ software CD, Compact Flash card, and documentation. Net-G3A Receiver The Net-G3A receiver’s advanced and feature packed design provides...

  • Page 21: Minter

    Getting Acquainted • Flexibility in software applications that control and monitor the receiver’s behavior, including PC-CDU, TRU, and TopNET, as well as user-written applications. • Flexibility in the physical interface used to connect the receiver with various external devices, including computers, network devices, various sensors, frequency sources, etc.
  • Page 22 Introduction STAT LED LINK LED Power LEDs Function Button Power Button STAT LINK PWR 1 RX/TX PWR 2 REC LED RX/TX LED Figure 1-2. Net-G3A MINTER display the status of power supplied from the The PWR LEDs corresponding external or internal power source. •...
  • Page 23 Getting Acquainted • Red blinks – The receiver is charging the corresponding battery. • Off – The receiver consumes power from internal backup batteries or the receiver is turned off. displays the data recording status. See “The FN The REC LED button”...
  • Page 24 Introduction Table 1-1 describes the REC LED status when using the FN button. Table 1-1. FN Button Operations and REC LED Status FN Key REC LED Status When data recording is off, and the FN key is... No light No data recording. Orange blink Internal file system test in progress.
  • Page 25 Getting Acquainted Table 1-1. FN Button Operations and REC LED Status (Continued) FN Key REC LED Status When data recording is on, and the FN key is... No free memory; hardware problem with data recording. If FN key mode is “LED blink mode switch” Green Data recording started (post-processing occupation mode undefined).

  • Page 26: Data And Power Ports

    Introduction Data and Power Ports The Net-G3A has ports on both the front and back panels. has one port (Figure 1-3): Serial (7 pin ODU-MINI- The front panel SNAP) – used for communication between the receiver and an external device. This is the receiver’s serial port A. Serial Port STAT LINK...
  • Page 27 Getting Acquainted • Ethernet/USB port (12-pin ODU-MINI-SNAP) – used to connect the receiver to a computer or network via the adapter cable, which is also connected to the Ethernet/USB port. Connects to the Ethernet/USB port on the receiver Ethernet and USB ports Figure 1-4.

  • Page 28: Cf Card Slot

    Compatible with the Net-G3A” on page A-15 for a list of compact flash cards successfully tested with the Net-G3A. Before using any other CF cards, consult with Topcon customer support about compatibility. See “Obtaining Customer Support” on page 5-7. The receiver recognizes up to 2 GB of memory. The recognizable capacity is controlled through the corresponding receiver option.
  • Page 29 Getting Acquainted Always initialize the file system on the installed CF card before the first use. The initialization procedure is described in “Initializing File System” on page 4-12. STAT LINK PWR 1 RX/TX PWR 2 Card Slot Button CF Card Slot Figure 1-6.

  • Page 30: Mounting Holes

    Introduction Mounting Holes The receiver has four mounting holes on the bottom to install #8-32 screws for a permanent mount (Figure 1-7). Installing the receiver using these screws prevents unwanted movement. Figure 1-7. Net-G3A Bottom Mounting Holes Cables and Power Supply The Net-G3A package includes standard communication and power cables for configuring the receiver and providing a power source to the receiver.
  • Page 31 Getting Acquainted Table 1-2. Net-G3A Package Cables (Continued) Cable Description Cable Illustration Serial Cable Connects the receiver to an external device (controller or computer) for data transfer and receiver configuration. Body of connector is black. p/n 14-008005-03 Adapter Cable (with Ethernet and USB ports) Connects the receiver to a cross-over or straight-through Ethernet cable for...

  • Page 32: Other Kit Accessories

    14-008099-01 Other Kit Accessories The standard accessories in the Net-G3A package includes a 512 MB CF memory card, a CD that contains standard Topcon GPS+ configuration software, a fuse, and receiver documentation. Figure 1-8. Net-G3A Included Accessories For more details on the optional accessories and packages available for the Net-G3A, contact your local Topcon dealer.

  • Page 33: Option Authorization File (Oaf)

    Option Authorization File (OAF) Option Authorization File (OAF) Topcon Positioning Systems issues an Option Authorization File (OAF) to enable the specific options that customers purchase. An Option Authorization File allows customers to customize and configure the receiver according to particular needs, thus only purchasing those options needed.
  • Page 34 Introduction Notes: NET-G3A Operator’s Manual 1-22...
  • Page 35 Net-G3A in its intended application. The following sections describe these steps in detail: • “Determining the Reference Station Site” on page 2-2 • “Installing Topcon Software” on page 2-5 • “Installing the CF Card” on page 2-8 • “Installing the USB Mass Storage Device (UMS)” on page 2-9 •...

  • Page 36: Pre-Setup Preparation

    Pre-setup Preparation Determining the Reference Station Site The site at which the reference station will be installed requires that the project team make in advance specific decisions about the goals of the project and therefore the application. Once the application has been decided and the goals clarified, a site inspection will help determine specific hardware/software setups and other requirements.

  • Page 37: Perform A Site Inspection For The Net-G3A Reference Station

    Determining the Reference Station Site All project team members should have a clear understanding of the project’s purpose, goals, and application. Once the goals of the application have been identified, preliminary sites can be chosen, and then narrowed down to the most appropriate site. Perform a Site Inspection for the Net-G3A Reference Station When determining the location in which to place the Net-G3A,...
  • Page 38 Pre-setup Preparation – If you make your own cables, make sure that the cables are properly crimped. – Verify that you have connected each cable to its mating connector, and it is firmly seated. Building an antenna cabling system is one of the key components to successful operation of the Reference Station—especially when using an antenna cable longer than 30 meters or connecting multiple antennas to the same...

  • Page 39: Installing Topcon Software

    CD-ROM drive. If you are downloading the program(s) from the website, then extract the program’s files into a folder on the computer’s hard drive. Refer to the Topcon Link documentation for details on installation and usage. If you purchased the TopNET reference station software suite, then refer to the corresponding documentation for installing and using this software and for configuring the Net-G3A using TopNET.

  • Page 40: Installing Pc-Cdu

    Positioning Systems. PC-CDU uses the GNSS Receiver Interface Language (GRIL) to configure various receiver settings and diagnose receiver performance. PC-CDU is available for free on the Topcon website (www.topconpositioning.com) or the GPS+ CD. Computer requirements for PC-CDU are: Windows® 98 or newer and an RS-232C or USB port.

  • Page 41: Installing Floader

    Installing Topcon Software navigate to the location of the *.exe file. To uninstall PC-CDU, Select the file, and press Delete. Installing FLoader FLoader is a firmware loading program for the GPS board inside the receiver. FLoader is available for free on the TPS website (www.topconpositioning.com) or the GPS+ CD.

  • Page 42: Installing The Cf Card

    Pre-setup Preparation Installing the CF Card Behind the door of the front panel is a slot for the optional CF card. The CF card provides memory space in which to save logged data. The Net-G3A package includes a 512MB CF card or an optional 2GB CF card.

  • Page 43: Installing The Usb Mass Storage Device (Ums)

    Installing the USB Mass Storage Device (UMS) Ensure the button is recessed before closing the NOTICE receiver door. Once the receiver is turned on, the receiver board detects the CF card and is ready for use as needed. Always initialize the file system on the installed CF card before the first use.

  • Page 44: Formatting The Ums Device

    Pre-setup Preparation Formatting the UMS Device The NET-G3A requires an external UMS device formatted for the FAT32 file system. The UMS device can be formatted using the internal Disk Management application provided by Microsoft Windows; however, this application cannot create partitions larger than 32 GB.

  • Page 45: Powering The Receiver

    Powering the Receiver on. If the receiver is turned on, then the receiver board begins to detect the UMS device and the REC LED blinks yellow. 3. If necessary, supply power to the UMS device: • For a flash-based UMS device, the NET-G3A supplies enough power through the USB connection that an external power supply for the UMS device is not necessary.

  • Page 46: Checking Power Status

    4. Plug the power supply to an available outlet. To grounded outlet Figure 2-5. Connecting the Net-G3 to a Power Source Checking Power Status You can check the receiver’s power status using the PWR LEDs or available Topcon software. The power LEDs on the receiver indicate the following power status: •...

  • Page 47: Turning On/Off The Receiver

    Charging the Backup Batteries • Green blinks – power within the acceptable range (6–28 V DC) is present on this PWR port and is being used to power the receiver and to charge the corresponding battery. • Red blinks – the corresponding backup battery is being charged. •...

  • Page 48: Collecting Almanacs And Ephemerides

    Pre-setup Preparation the power supplied by the external source and maintains the backup batteries in a charged condition. The Li-Ion batteries used in the iBEST system should run at no less than 80 percent capacity after 500 charging cycles. These batteries do not need to be drained before recharging.

  • Page 49: Connecting The Receiver And A Computer

    Connecting the Receiver and a Computer To collect almanacs and ephemerides: 1. Set up the receiver. The external antenna should be in a location with a clear view of the sky. 2. Turn on the receiver. 3. Wait for about 15 minutes while the receiver collects complete almanac and ephemeris data from the satellites.

  • Page 50: Establishing An Rs232 Cable Connection

    Pre-setup Preparation Establishing an RS232 Cable Connection The following steps describe the physical connection of the cable, receiver, and computer. For a description of a software connection with the receiver, see “PC-CDU Connection Parameters” on page 2- 1. Using the RS232 cable, connect the serial port of your computer (usually COM1) to the receiver’s serial port (either ODU or DE-9).

  • Page 51: Establishing A Usb Cable Connection

    Connecting the Receiver and a Computer Establishing a USB Cable Connection Make sure the computer has the TPS USB driver installed. The following steps describe the physical connection of the cable, receiver, and computer. “PC-CDU Connection Parameters” on page 2-22 describes a software connection with the receiver. 1.
  • Page 52 Pre-setup Preparation The Net-G3A and associated software have two Ethernet connection options using the Ethernet adapter from the Net-G3A kit and an Ethernet cable purchased from a computer supply store: • a direct connection – requires an Ethernet crossover cable •...

  • Page 53: Configuring An Ethernet Connection Using Pc-Cdu

    Connecting the Receiver and a Computer Configuring an Ethernet Connection Using PC-CDU Before you can use the Ethernet option on a Net-G3A, the settings for this connection method need to be configured. You will need the following hardware/software components to use an Ethernet connection.
  • Page 54 Pre-setup Preparation Both Ethernet connection methods are included in the following procedure. Use a direct Ethernet connection to test the effectiveness of this connection method before connecting to a network. 1. Connect the receiver and computer using an RS232 cable. See “Establishing an RS232 Cable Connection”...
  • Page 55 Connecting the Receiver and a Computer 6. For network connections, configure FTP Settings (optional) with the following selections (Figure 2-9): • TCP port – 21 (default value). This is the port on which the receiver listens for an FTP connection. The receiver allows up to five FTP connections at a time.

  • Page 56: Pc-Cdu Connection Parameters

    Pre-setup Preparation PC-CDU Connection Parameters When connecting to the receiver via PC-CDU, the type of connection determines the parameters to select. Table 2-1 and Table 2-2 list the parameters for the four connection types. Table 2-1. PC-CDU Connection Parameters for RS232 and USB Parameter RS232 Connection...
  • Page 57 Connecting the Receiver and a Computer Table 2-2. PC-CDU Connection Parameters for Ethernet Parameter Direct Network Connection Direct Mode Port ETHR TCP port 8002 (default) Host name IP address assigned to the receiver Password Assigned during initial setup Figure 2-11. PC-CDU Connection Settings – Ethernet (Direct Example) P/N 7010-0935 2-23...

  • Page 58: Power Management

    Pre-setup Preparation Power Management Topcon’s PC-CDU software provides an interface for various configuration, monitoring, and management functions for the receiver. For power management of the receiver, PC-CDU displays the current voltage for the power source. 1. Connect your receiver and computer. See “Connecting the Receiver and a Computer”...

  • Page 59: Net-G3A Configuration And Setup

    Net-G3A Configuration and Setup The Net-G3A is intended primarily for use as a permanent or semi- permanent GNSS Reference Station to establish networks supporting both real-time and post-processing applications. Observation data can be streamed through any port to any device capable of receiving and utilizing it, including TopNET Reference Station software.

  • Page 60: Configuring The Receiver

    CF card, streams the data to a central computer, and possibly connects directly to one or more radios (or any combination of these configurations). Topcon's PC-CDU and TopNET software are used to manage and configure the various functions of the receiver.
  • Page 61 Configuring the Receiver 2. Start PC-CDU, and connect to the receiver according to the settings described in “PC-CDU Connection Parameters” on page 2-22. Once a PC-CDU connection with the receiver has been established, the current communications settings—such as port name, baud rate (if applicable), and flow control (if applicable)— display in the lower-left corner of the main window of PC-CDU.
  • Page 62 Net-G3A Configuration and Setup 4. Click Set all parameters to defaults (Figure 3-2). Figure 3-2. Set All Parameters to Defaults 5. Click the MINTER tab, configure the following settings (Table 3-1), and then click Apply (Figure 3-3). Table 3-1. Receiver Parameters for the MINTER Tab Parameter Setting Recording interval...
  • Page 63 Configuring the Receiver Figure 3-3. Configure MINTER for Static Data Recording 6. Click the Positioning tab, make sure the Elevation mask is set to 5 (default value), and then click Apply. Figure 3-4. Configure Receiver Positioning – Elevation Mask 7. Click the Base tab, set the following parameters (Figure 3-5 on page 3-6), and then click Apply.
  • Page 64 Net-G3A Configuration and Setup – Click Get from receiver. The reference geodetic coordinates specified on this NOTICE tab relate to the antenna L1 phase center. 8. Continue with step 8 on page 3-6 for RTK surveys or step 9 on page 3-7 for other configurations.
  • Page 65 Configuring the Receiver Table 3-2. Receiver Parameters for the Ports Tab (Continued) Parameter Base Receiver Baud rate Select a baud rate to use for transmitting differential messages from the receiver board to the modem module. The baud rate must match the modem’s serial port speed. RTS/CTS Select to enable handshaking.
  • Page 66 Net-G3A Configuration and Setup • Carrier multipath reduction – enable Figure 3-7. Configure Mulitpath Parameters 11. Click OK to save the settings and close the dialog box. Once the receiver is configured, the configuration will remain until you change it using PC-CDU or clear the NVRAM. For more details on the settings available for configuring the Base and Rover receivers, refer to the PC-CDU Reference Manual.

  • Page 67: Minter Description And Configuration

    MINTER Description and Configuration MINTER Description and Configuration The Minimum INTERface (MINTER) consists of two keys (power and FN) that control the receiver’s operation, four LEDs that display the receiver’s operational status, and two LEDs that display the power status (Figure 3-8). STAT LED LINK LED Power LEDs...
  • Page 68 Net-G3A Configuration and Setup • Shows the status of post-processing mode (static or dynamic) when performing a Post-Processing Kinematic survey with the help of the FN key (REC LED). • Shows the power status for the receiver (PWR LEDs). Use PC-CDU to configure MINTER settings. The procedure below describes the most common settings;...
  • Page 69 MINTER Description and Configuration • Always append to the file on page 3-12 • Files Creation mode on page 3-12 • Automatic File Rotation Mode (AFRM) on page 3-12 • FN key mode on page 3-13 • Initial data collection dynamic mode on page 3-14 •...
  • Page 70 Net-G3A Configuration and Setup <prefix><month><day><sequential lowercase letter><numeric portion> The file name depends on both the file creation time (month and day) and additional letter and numeric suffixes to avoid confusion between files created on the same day. If you want new receiver Always Append to the File parameter data to be appended to an existing log file, enter the desired file name in this parameter.
  • Page 71 MINTER Description and Configuration • Files (total) – a counter that specifies how many multiple log files must be created in AFRM until this mode automatically turns off. This counter decrements on every file rotation until its value becomes zero, then file rotation automatically stops. The counter initializes with AFRM.
  • Page 72 Net-G3A Configuration and Setup dynamic, if it blinks orange, the current mode is static. For more details, see Table 1-1 on page 1-12 and refer to the PC-CDU Reference Manual. These radio Initial Data Collection Dynamic Mode parameter buttons specify the starting occupation type descriptor inserted at the beginning of receiver files logged.
  • Page 73 MINTER Description and Configuration Table 3-3. Data Recording Parameter Behavior (Continued) Enabled Radio Button Results Before Power Failure Always No file Data logging will Data logging will A log file with a specified; not start when not start when default name will receiver data power is restored.

  • Page 74: Minter Operation

    Net-G3A Configuration and Setup MINTER Operation press the power button (Figure 3-12). To turn on/off the receiver, • When turning on, press the power button until the MINTER’s LEDs briefly flash. • When turning off, press the power button until the PWR LEDs turn red, then release.
  • Page 75 MINTER Description and Configuration Each time you turn off or on data recording, either a new file opens or data appends to a particular file. See “Always Append to the File parameter” on page 3-12 and “Files Creation Mode parameter” on page 3-12 for information on setting these functions.

  • Page 76: Using The Web Interface

    Net-G3A Configuration and Setup Using the Web Interface The Net-G3A includes a built-in Web server that allows you to configure and monitor the receiver via a Web user interface (or Web interface). The following Web browsers are recommended for accessing the receiver: •...
  • Page 77 Your communications will use SSL. 3. Log in through the Web interface by entering the login name and password in the appropriate fields. The default login and password are topcon. Login names and passwords are case-sensitive and can be up to 12 alphanumeric characters.

  • Page 78: Understanding The Web Interface

    • Use only low-loss coaxial cables. For distances of up to 10 meters, it is recommended to use Topcon’s RG-58 cable. If a greater length is required (up to 30 meters), it is recommended to use Topcon’s RG-8 or LMR-400.

  • Page 79: Receiver Setup As A Temporary Reference Station

    • Beyond 30 meters, consider using in-line amplifiers or extra low loss cables. Topcon offers 30 and 60 meter cable options using LMR-400 and a 100 meter cable using LMR-600. For LMR-600 at 1600 MHz, the attenuation is 0.1 dB/meter.

  • Page 80: Step 1: Set Up The Receiver

    Net-G3A Configuration and Setup Before logging data, make sure the receiver contains current almanac and current ephemeris data (see “Collecting Almanacs and Ephemerides” on page 2-14). Step 1: Set up the Receiver 1. Place the receiver in the predetermined location. A sturdy shelf or out-of-the-way table may be a convenient spot.

  • Page 81: Step 2: Measure Antenna Height

    Receiver Setup as a Temporary Reference Station To Grounded Power Outlet To Power Port 1 To GPS Antenna To GPS Antenna Port S TA LI N R E C R X /T Figure 3-17. Mount Receiver and Connect Cables Step 2: Measure Antenna Height The location of the antenna relative to the point being measured is very important for both surveys in which the elevation of the point is important and in surveys for horizontal location only.
  • Page 82 Net-G3A Configuration and Setup • Model of the antenna used Antennas have two types of measurements: • Vertical – measured from the marker to the antenna reference point (ARP) located on the bottom of the antenna at the base of the mounting threads.

  • Page 83: Step 3: Collect Data

    Receiver Setup as a Temporary Reference Station Reference Surface for Offset Measurements Figure 3-18. Measure Antenna Height – Example Step 3: Collect Data See the remaining sections in this chapter for more information about collecting data. 1. Turn on the receiver. The STAT (status) light LED blinks red at first.

  • Page 84: Stopping Data Logging

    Net-G3A Configuration and Setup started. The REC LED blinks each time data is saved to the memory. Use PC-CDU to configure data logging. See “MINTER Description and Configuration” on page 3-9 or refer to the PC-CDU Reference Manual. Stopping Data Logging Stop logging data when you need to move the receiver, download data, or perform maintenance functions.

  • Page 85: Analyzing Signal-To-Noise Ratio

    After the survey completes, data the receivers collect can be downloaded onto a computer and processed using post-processing software (for example, Topcon Tools). Analyzing Signal-to-Noise Ratio Knowing the strength and reliability of the ranging signal transmitted from the satellites will help determine the quality of the satellite signals.

  • Page 86: Using The Anti-Jamming Suppressor (Ajs)

    If you have any problems or questions on using the Net-G3A with these devices, contact your local Topcon dealer. For contact information, visit the TPS website at: http://www.topconpositioning.com/static/dealer_pointer.php NET-G3A Operator’s Manual...

  • Page 87: Receiver And File Maintenance

    Also, the memory card holds a finite amount of files and information, so downloading data prevents files from being lost. The following steps use PC-CDU to download files, but any Topcon receiver management software can be used. P/N 7010-0935...

  • Page 88: Downloading Data Files To A Computer

    Receiver and File Maintenance Downloading Data Files to a Computer 1. Connect your receiver and computer. See “Connecting the Receiver and a Computer” on page 2-15 for information about this procedure. PC-CDU automatically appears with the Connection Parameters dialog box open. If this dialog box is not open, then click File File Manager on the PC-CDU main page.
  • Page 89 Downloading Data Files from an Installed Memory Card 4. Navigate to or create (using the Create button) the folder in which to download and store files. 5. Click the Download files tab, and select the file(s) to download (Figure 4-3 on page 4-3). To select multiple files, hold down the shift key and click on sequential files to select several files at once, or hold down the Ctrl key and click on individual files.

  • Page 90: Downloading Data Files To A Ums Device

    Receiver and File Maintenance • Green indicator – file has successfully downloaded. Figure 4-4. Download Files – Status Indicators 7. Click Exit on the File Manager dialog box. 8. Continue with other operations, or click File Disconnect and then File Exit to quit PC-CDU. Downloading Data Files to a UMS Device 1.
  • Page 91 Downloading Data Files from an Installed Memory Card Figure 4-5. Connection Parameters – RTS/CTS Handshaking 5. Click File File Manager. 6. In the File Manager dialog box, click the USB Copy tab (Figure 4-6). Figure 4-6. USB Copy P/N 7010-0935...
  • Page 92 Receiver and File Maintenance 7. Click Activate, and then click Yes to make the inserted UMS device ready for copying. Figure 4-7. Activate the Inserted UMS device 8. In the Internal Storage box, select the file(s) to download (Figure 4-8 on page 4-7). To select multiple files, hold down the shift key and click on sequential files to select several files at once or hold down the Ctrl key and click on individual files.

  • Page 93: Downloading Data Files From A Removed Memory Card

    Topcon Link software. A CF card reader in or connected to the computer is required to access the data on the card. Before Topcon Link can read data on a Memory Card, the card must be formatted for Topcon devices.

  • Page 94: Deleting Data Files From An Installed Memory Card

    Receiver and File Maintenance 2. Navigate to the Topcon Memory Cards device directory, and click the device icon. 3. Click the desired, formatted memory card device icon. To download data files: After formatting the card, select and copy, or select and drag-and- drop, the desired files into a directory on the computer.
  • Page 95 Deleting Data Files from an Installed Memory Card 2. On the Connection Parameters dialog box, enable RTS/CTS handshaking (Figure 4-10). Figure 4-10. Connection Parameters – RTS/CTS Handshaking 3. Click File File Manager and select the file(s) to delete on the Download files tab (Figure 4-11 on page 4-10).

  • Page 96: Managing Receiver Memory

    Receiver and File Maintenance 7. Continue with other operations, or click File Disconnect, and then File Exit to quit PC-CDU. Figure 4-11. Delete Files Managing Receiver Memory When using the receiver in static or dynamic applications, you may need to know the amount of memory the receiver’s log file occupies. The specific memory size depends on the type of data being recorded.
  • Page 97 Managing Receiver Memory depends on the total number of GNSS satellites being tracked and used in position computation, and the recording interval. Table 4-1. Amount of Memory Required to Store a One Hour File Recording Interval (seconds) #SVs Single-frequency dual-system receiver Memory needed to record data 11 MB 1.1 MB...

  • Page 98: Initializing File System

    Receiver and File Maintenance Initializing File System Initializing the file system of a connected receiver erases all of the receiver’s data files. This process requires two confirmations before beginning and may take several minutes depending on the receiver’s memory size. First confirmation to initialize file system Second confirmation to...

  • Page 99: Setting Raw Data & Position Update Rates To 50 Hz

    Setting Raw Data & Position Update Rates to 50 Hz Ok – closes the dialog box. Always initialize the file system on the installed CF card before the first use. It is recommended to CAUTION reinitialize the receiver file system on a regular basis.

  • Page 100: Managing Receiver Options

    The receiver’s OAF lists all enabled or disabled features. To determine if a feature is turned on or which features are available, check the receiver’s OAF using available Topcon receiver management software. The following steps use PC-CDU to view options.
  • Page 101 Managing Receiver Options • positive integer – the option is enabled • yes or no – the option is either enabled or disabled 3. When finished, click Exit on the Option Manager dialog box, and then click File Disconnect to disconnect from PC-CDU (and prevent conflicts with serial port management).

  • Page 102: Loading An Oaf

    The following steps use PC-CDU to load the option file. For OAF related questions, e-mail TPS at options@topcon.com and include the receiver’s ID number. 1. Connect your receiver and computer. See “Connecting the Receiver and a Computer”...

  • Page 103: Resetting The Receiver

    Resetting the Receiver Resetting the Receiver If the receiver stops responding via buttons or software, then perform a hard reset. A hard reset should only be performed when the receiver is powered on and not otherwise responding. A hard reset simply cycles the receiver’s power. It does not erase information stored in the receiver’s NOTICE memory.

  • Page 104: Clearing The Nvram

    Receiver and File Maintenance Clearing the NVRAM The receiver’s Non-Volatile Random Access Memory (NVRAM) holds data required for satellite tracking, such as ephemeris data and receiver position. The NVRAM also keeps the current receiver’s settings, such as active antenna input, elevation masks and recording interval, and information about the receiver’s internal file system.

  • Page 105: Using Pc-Cdu To Clear The Nvram

    Changing Receiver Modes Using PC-CDU to Clear the NVRAM 1. Connect your receiver and computer. See “Connecting the Receiver and a Computer” on page 2-16 for this procedure. 2. Click Tools Clear NVRAM (Figure 4-16). Figure 4-16. Clear NVRAM with PC-CDU While the NVRAM clears, the REC LED flashes green and red;...
  • Page 106 Receiver and File Maintenance • Green – all other cases. The delimiter double-blink is followed by six LED blinks corresponding to six receiver tests, where each blink indicates the following information: Blink 1. Sufficient data for position computation. Blink 2. GPS S/N ratios are good (Table 4-2). Blink 3.

  • Page 107: Sleep (Off) Mode

    Loading New Firmware Sleep (Off) Mode Sleep mode is the normal “off” state of the receiver. 1. Turn on your receiver. 2. Press the receiver’s power key for more than four seconds and less than eight seconds. The STAT LED turns orange. The receiver enters Sleep Mode.
  • Page 108 You can download FLoader to your computer from the TPS website at www.topconpositioning.com. For more information, refer to the FLoader User’s Manual, also available on the Topcon website. See “Installing FLoader” on page 2-7 for installing FLoader on the computer.
  • Page 109 Loading New Firmware 5. Click the Device tab, and then select Receiver from the Device Type drop-down list. Figure 4-18. Set Device Type 6. Click Get from Device for device information (Figure 4-18). 7. Click the Program tab, and select Soft Break Capture from the Capture Method drop-down list (recommended) (Figure 4-19).
  • Page 110 Receiver and File Maintenance 10. Click File Exit. 11. Clear the receiver’s NVRAM (see “Clearing the NVRAM” on page 5-9) and update the almanac (see “Collecting Almanacs and Ephemerides” on page 2-23) after loading new firmware. NET-G3A Operator’s Manual 4-24...

  • Page 111: Chapter 5 Troubleshooting

    WARNING hardware. Check This First! Before contacting Topcon support, check the following: • Check all external receiver connections carefully to ensure correct and secure connections. • Double check for worn or defective cables.

  • Page 112: Troubleshooting Quick List

    Troubleshooting Troubleshooting Quick List For receiver power issues: If “The receiver does not power up.” see page 5-2. For receiver issues: If “The receiver cannot establish a connection to a computer or external controller.” see page 5-3. If “The receiver does not lock on to satellites for a long period of time.”...

  • Page 113: Receiver Problems

    • See “Net-G3A Receiver” on page 1-8 and “Connector Specifications” on page A-9 for information about the receiver’s connectors. The cable is damaged. Use an undamaged cable. Contact your Topcon dealer to replace the cable. Generic problems: The receiver port used for connection is not in Command mode.
  • Page 114 • Order a new OAF with the desired options activated to enable or extend validity of the corresponding receiver options. Contact your dealer or visit the Topcon website at www.topconpositioning.com for details. • Refer to the PC-CDU Reference Manual for a detailed description of options.
  • Page 115 • Order a new OAF with the desired options activated to enable or extend validity of the corresponding receiver options. Contact your dealer or visit the Topcon website at www.topconpositioning.com for details. • Refer to the PC-CDU Reference Manual for a detailed description of options.
  • Page 116 Troubleshooting Poor satellite geometry (PDOP/GDOP values are too high). Conduct your survey when PDOP values are low. The elevation mask is above 15 degrees. Lower the elevation mask. See page 3-5 for information on setting the elevation mask. The receiver does not start data logging. The receiver has no memory card installed or the memory option is disabled or expired.

  • Page 117: Obtaining Customer Support

    Obtaining Customer Support Before contacting Topcon customer support about any problems with the receiver, consult your local Topcon dealer and also see “Check This First!” on page 5-1 for some solutions that may fix the issue. If, after taking the above steps, you still need assistance, contact Topcon customer support.

  • Page 118: Website

    Website The Topcon Positioning Systems website provides current information about Topcon’s line of products. The support area of the website provides access to frequently asked questions, configuration procedures, manuals, e-mail support, etc.

  • Page 119: Appendix A Specifications

    Specifications This Topcon product is a 144-channel GNSS receiver with an optional, removable CF memory card, a rugged aluminum housing complete with MINTER and cable connectors. Performance specifications assume a minimum of 6 GPS satellites above 15 degrees in elevation and...

  • Page 120: Net-G3A Dimensions

    Specifications Net-G3A Dimensions Figure A-1 shows the measurement dimensions for the Net-G3A receiver, including the placement of the screw holes. Dimensions are in inches. NOTE STAT LINK PWR 1 RESET PWR 2 3.75 4.960 4X Ø0.135 1.244 8-32 UNC 11.0 6.693 Figure A-1.

  • Page 121: Receiver Specifications

    Table A-1 table lists the receiver’s general specifications. Table A-1. Receiver General Specifications Physical Enclosure Aluminum, IP67 rated extrusion Color Topcon Yellow and Topcon Grey Dimensions W:166 mm x H:93 mm x D:275 mm 6.54" x 3.66" x 10.83" Weight 3.0 kg (6.61 lbs)
  • Page 122 Specifications Table A-1. Receiver General Specifications (Continued) Power External power 2 ports Input voltage 6 to 28 V DC Consumption 4.5 W typical 5 W maximum On-board Backup battery for timekeeping and almanac data storage; 10 years minimum operation; two internal batteries for up to 25 hours of emergency operation.
  • Page 123 Receiver Specifications Table A-1. Receiver General Specifications (Continued) Data Features Up to 50 Hz update rate for real time position and raw data (code and carrier) 10cm code phase and 0.1mm carrier phase precision RTCM SC104 version 2.1, 2.2, 2.3, and 3.0 I/O Multiple Base RTCM Geoid and Magnetic Variation models Different DATUMs support...
  • Page 124 Specifications Table A-1. Receiver General Specifications (Continued) Ambiguity initialize OTF (L1, L1/L2) and known point initialization Initialize time 5 seconds to 10 min depending on the base line length and multipath conditions Output interval for 1Hz standard; 5, 10, 20, 50 Hz optional CMR/RTCM Elevation 0 to 90 degrees (independent of data logging)

  • Page 125: Gnss Board Details

    Receiver Specifications Table A-1. Receiver General Specifications (Continued) DGPS Post processing: less than 0.25m (HRMS) DGPS/RTCM based: less than 0.25m (HRMS) Cold Start < 60 sec Warm Start < 10 sec Reacquisition < 1 sec GNSS Board Details Table A-2 lists the GNSS board’s general specifications. Table A-2.
  • Page 126 Cinderella days is an option that turns a single frequency, GPS receiver into a dual-frequency, GPS+GLONASS receiver for 24 hours every other Tuesday at GPS midnight. Refer to Topcon’s website at www.topconpositioning.com for more information and specific Cinderella day dates.

  • Page 127: Connector Specifications

    Connector Specifications Connector Specifications The Net-G3A has the following connectors: • Power x 2 • GPS antenna • Serial RS232C: 1xODU and • 1PPS 3xDE-9 • Event marker • USB Host/Device • External Frequency • Ethernet Power Connector The power connector (Figure A-2) is a sealed receptacle, 5 pin, ODU part number G80F1C-T05QF00-0000.

  • Page 128: Serial Rs232C Connectors

    Specifications Serial RS232C Connectors The front panel serial RS232 connector (Figure A-3) is a sealed receptacle, 7 pin, ODU part number G80F1C-T07QC00-0000. Figure A-3. Serial RS232 Connector Table A-4 gives the RS232 cable connector specifications. Table A-4. RS232 Connector Specifications Number Signal Name Details...

  • Page 129: Ethernet/Usb Connector

    Connector Specifications Table A-5 gives the RS232 cable connector specifications. Table A-5. RS232 Connector Specifications Number Signal Name Details Not used Receive data Transmit data Not used Signal ground Not used Request to send Clear to send Not used Ethernet/USB Connector The Ethernet/USB connector is a 12-pin ODU-MINI-SNAP (Figure A-5).

  • Page 130: Gps Antenna Connector

    Specifications Table A-6 gives Ethernet/USB connector specifications. Table A-6. Ethernet/USB Connector Specifications Number Signal Name Details LAN TXD+ Transmit data plus LAN TXD- Transmit data minus LAN RXD+ Receive data plus LAN RXD Receive data minus USB_PWR_HOST Power to the UMS device USB_HOST_D- Data minus USB_HOST_D+...

  • Page 131: 1Pps Connector

    Connector Specifications 1PPS Connector The 1PPS connector is a coaxial female receptacle of BNC series, Kings Electronics part number KC-79-108. Table A-8. 1PPS Connector Specifications Connector BNC female Polarity Positive Pulse Signal level >=2 V, TTL into 50 Ohm load Pulse Width 3.3 msec (normal pulse);...

  • Page 132: External Frequency Connector

    Specifications Table A-9. Event Marker Connector Specifications (Continued) Pulse Width >= 100 nsec Synchronization Rising/Falling (user selectable) Edge Resolution 5 nsec Reference time GPS, GLONASS, UTC (USNO), UTC (SU) External Frequency Connector The External Frequency connector is a coaxial female receptacle of BNC series, Kings Electronics part number KC-79-108.

  • Page 133: Cf Cards Compatible With The Net-G3A

    Net-G3A The following CF cards have been successfully tested with the Net-G3A and can be safely used with the receiver. Before using any other CF cards, consult with Topcon customer support about compatibility. Table A-11. Net-G3A CF Cards Compatibility List...
  • Page 134 Specifications Table A-11. Net-G3A CF Cards Compatibility List (Continued) Capacity (MB) Topcon part number Manufacture part number 22-006011-32 SSD-C32MI-3012 22-006011-128 SSD-C12MI-3012 22-006011-256 SSD-C25MI-3012 22-006011-512 SSD-C51MI-3012 1024 22-006011-001 SSD-C01GI-3012 White Electronics Designs 22-006011-128 WED7P128CFA7000I25 22-006011-256 WED7P256CFA7000I25 22-006011-512 WED7P512CFA7000I25 1024 22-006011-001 WED7P1G0CFA7000I25 NET-G3A Operator’s Manual...

  • Page 135: Appendix B Safety Warnings

    General Warnings Safety Warnings General Warnings TPS receivers are designed for survey and survey related uses (that is, surveying coordinates, WARNING distances, angles and depths, and recording such measurements). This product should never be used: • Without the user thoroughly understanding this manual.

  • Page 136: Usage Warnings

    Safety Warnings Usage Warnings If this product has been dropped, altered, transported or shipped without proper packaging, or CAUTION otherwise treated without care, erroneous measurements may occur. The owner should periodically test this product to ensure it provides accurate measurements. Inform TPS immediately if this product does not function properly.

  • Page 137: Regulatory Information

    FCC Compliance Regulatory Information The following sections provide information on this product’s compliance with government regulations for use. FCC Compliance This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: 1. This device may not cause harmful interference, and 2.

  • Page 138: Community Of Europe Compliance

    Regulatory Information Any changes or modifications to the equipment not expressly approved by the party responsible for CAUTION compliance could void your authority to operate such equipment. Community of Europe Compliance The product described in this manual is in compliance with the R&TTE and EMC directives from the European Community.

  • Page 139: Appendix D Warranty Terms

    1. The warranty against defects in a Topcon battery, charger, or cable is 90 days. P/N 7010-0935...
  • Page 140 Warranty Terms Notes: NET-G3A Operator’s Manual...
  • Page 141 3-20 antenna cabling system overview 3-24 Antenna reference point Download See also ARP 4-1–4-4 files via PC-CDU 3-24 files via Topcon Link 3-12 Automatic file rotation mode 4-21–4-24 firmware indicators software Base configuration, static 3-3–3-8 Base station, configuration Beacon, DGPS overview 4-19–4-20...
  • Page 142 File name prefix 2-15 USB driver Files 3-24 Internal antenna offset 4-10 delete 4-1–4-4 download via PC-CDU download via Topcon Link 4-21, 4-23 flash 4-21, 4-23 LINK 4-3, 4-6 select in PC-CDU 1-10 select in Topcon Link 1-11 REC blink pattern...
  • Page 143 1-15 Ethernet 2-22 RS232 connection parameters 1-15 event 1-15 external frequency 1-11 RX TX LED 1-15 GPS antenna 1-14 NET-G3 back 1-15 NET-G3 front 1-15 power SD/CF card, install 1-15 Serial number 1-14 serial, back 1-14, 1-15 Serial port 1-15...
  • Page 144 Index 3-26 Static survey 3-26 Survey 3-21 Temporary reference station 4-19, B-2 Test 4-19–4-20 Topcon Link Topcon Link, download files TopNET, configure receiver Uninstall FLoader PC-CDU 2-22 USB connection parameters 2-15 USB driver 1-15 USB port Warnings general usage 3-18 Web interface NET-G3A Operator’s Manual...
  • Page 146 Topcon Positioning Systems, Inc. 7400 National Drive, Livermore, CA 94550 800∙443∙4567 www.topconpositioning.com ISO 9001:2000 FM 68448 NET-G3A Operator’s Manual P/N: 7010-0935 Rev A 05/09 ©2009 Topcon Corporation All rights reserved. No unauthorized duplication.

Table of Contents