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OXTS RT-Base S User Manual

Portable gnss base station
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RT-Base S
Portable GNSS Base
Station

User Manual

Confidently. Accurately.

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Summary of Contents for OXTS RT-Base S

  • Page 1: User Manual

    RT-Base S Portable GNSS Base Station User Manual Confidently. Accurately.
  • Page 2 Document Revision: 151112 (See Revision History for detailed information). Contact Details Oxford Technical Solutions Limited Tel: +44 (0) 1869 238 015 77 Heyford Park Fax: +44 (0) 1869 238 016 Upper Heyford Oxfordshire Web: http://www.oxts.com OX25 5HD Email: support@oxts.com United Kingdom Oxford Technical Solutions...
  • Page 3 RT-Base S User Manual Warranty Oxford Technical Solutions Limited warrants its products to be free of defects in materials and workmanship, subject to the conditions set forth below, for a period of one year from the Date of Sale. ‘Date of Sale’ shall mean the date of the Oxford Technical Solutions Limited invoice issued on delivery of the product.

  • Page 4: Table Of Contents

    Position manager   Downloading and converting the internally logged correction data   Attaching the second modem   Changing the differential correction format   What the RT-Base S transmits in each mode   Repeatability   Revision history   Oxford Technical Solutions...

  • Page 5: Introduction

    RT-Base S User Manual Introduction The RT-Base S is a self-contained, weatherproof and portable GNSS base station. It is designed to be quick and easy to set-up, and transmits corrections to local receivers via radio modem or (optionally) via Wi-Fi.
  • Page 6 GNSS receiver also has to figure out the difference in the number of carrier-phase cycles between the RT-Base S and the itself. To do this, the RT-Base S measures the carrier-phase of the signals from each satellite and transmits it to the remote system.

  • Page 7: Transmitting The Corrections

    While the RT-Base S will work seamlessly with our own GNSS-aided INS products, it is not limited to them in any way. The RT-Base S can also serve as a general base station for other products. To help achieve this the RT-Base S transmits corrections in six common formats: RTCA, RTCA2, RTCM, RTCMv3, CMR, CMR+.

  • Page 8: Scope Of Delivery

    Scope of delivery Table 2 lists all the standard items that are delivered with an RT-Base S. Table 3, Table 4 and Table 5 list additional components that are supplied, depending on the radio modem being supplied. Please note: the customer must check that the supplied radio can be used without a license, or obtain a suitable license before using the RT-Base S.
  • Page 9 Table 3. Additional components when supplied with SATEL radios Qty. Description SATEL Satelline-3ASd radio modems—one modem is pre-installed into the RT-Base S Radio modem antenna with 3 m cable and magnetic bases Table 4. Additional components when supplied with FreeWave radios Qty.

  • Page 10: Specification

    11.9 kg (inc. all accessories) Please note: The casing of the RT-Base S is air-tight when closed, but it is fitted with a one-way valve to release excess pressure. If the RT-Base S has been transported by air, it may be necessary to open the valve (located behind the handle) to balance the air pressure inside the case before it can be opened.

  • Page 11: Conformance Notices

    RT-Base S User Manual Conformance notices Any use or misuse of the RT-Base S, in a manner not intended by OxTS, may impair the protection provided. The RT-Base S has been tested to, and passed, the following standards:  EN 61326-2-1:2013 Electrical equipment for measurement, control and laboratory use.

  • Page 12: Operation

    Operation The RT-Base S has been designed to be as easy to operate as possible. However, it is important to have a sound understanding of how the system works, so please read the manual thoroughly before operating the product. The set-up procedure is summarised below. More detailed information on each step is also presented in the following sections.

  • Page 13: To Disconnect The Battery

    Selecting a suitable antenna location, and setting up the tripod For the RT-Base S to work to specification, it is essential to put the antenna in a location where it has a clear view of the sky. GNSS antennas do not only look for satellites from above, they also receive signals from the side—down to an elevation of...
  • Page 14 When operating in hot environments, the RT-Base S unit should not be left in direct sunlight or the internal temperature may exceed the specification. The temperature range of the unit is restricted because of the internal battery.

  • Page 15: Connecting The Gnss Antenna And Radio Modem Cables

    Connecting the GNSS antenna and radio modem cables Before powering up the RT-Base S, the GNSS antenna should be connected to the GNSS connector using the supplied GNSS cable. The GNSS connector on the RT-Base S is located to the left of the carry handle.

  • Page 16: Powering Up And Monitoring The Rt-Base S

    Please note that a number of factors affect the time taken for the RT-Base S to acquire satellites. The process normally takes about 90 seconds, but can take up to 20 minutes if the unit has been turned off for a long period of time or has been moved a significant distance since last time it was used.
  • Page 17 When power is first applied, the LCD display shows the firmware version running in the RT-Base S along with and the static IP address the unit is using to communicate (Figure 7). This information page is displayed for 10 seconds.
  • Page 18 Once the system has booted, the Scroll, Menu/Enter and Back buttons located on the control panel can be used to access the internal menu system. This menu system provides an easy way to adjust the main settings used by the RT-Base S. The layout of the menu system is shown in Figure 11.
  • Page 19 RT-Base S User Manual Figure 11. RT-Base S settings menu layout and navigation The settings menu can be accessed at any time from the status pages by pressing the Menu/Enter button. This image shows how the settings menu is laid out. Once an option has been chosen, a brief confirmation message (not shown here) will be displayed.

  • Page 20: Configuring The Rt-Base S Using Navbase

    While it is possible to change most major settings using the built-in buttons and menu system, in order to use all features of the RT-Base S, you will need to use our free configuration software. Each RT-Base S is supplied with a CD containing a copy of our latest NAVsuite software.

  • Page 21: Check Your Ip Settings

    Ethernet. This normally takes the form 195.0.0.s, where s is the last two digits of the product’s serial number. In order to reliably communicate with the RT-Base S, the PC you are using must also be using a unique IP address in the same range.

  • Page 22: The Navbase Interface

    Figure 13. Changing the PC’s IP address The RT-Base S uses a static IP address in the range 195.0.0.10—255. To properly communicate with it, the IP address of the PC should use a unique address from the same range. The NAVbase interface NAVbase can be started by clicking the Start button and typing navbase, or by clicking Start >...
  • Page 23 RT-Base S User Manual Figure 14. The initial screen presented by NAVbase Select the RT-Base S and click Next or click Read Configuration on the left-hand navigation pane. Read Configuration page The Read configuration page tells NAVbase what initial settings it should use, and...
  • Page 24 Settings from the navigation pane on the left-hand side. Settings page All the RT-Base S parameters that can be changed are grouped together on the Settings page. Unlike previous pages, the Settings page is only of use when a live RT-Base S is Oxford Technical Solutions...
  • Page 25 Figure 16. The Settings page in NAVbase The Settings page of NAVbase. Settings are sent to the selected RT-Base S via Ethernet once you click the Next button. The parameters that can be adjusted via this page are: Averaging time: This is the same setting that can be adjusted using the buttons on the RT-Base control panel.
  • Page 26 Status page The Status page is used to display real-time information about the RT-Base S when it is connected to the PC via Ethernet. The IP address of the system being watched is set on the Settings page.

  • Page 27: Position Manager

    Figure 17. NAVbase Status page To view the live status, select the IP address of an RT-Base S on the Settings page, then click Next. As well as providing visual feedback on the state of the system, the Status page is also used to control the file management of the RT-Base S.
  • Page 28 A dialog will open, allowing a location to be chosen. To force the RT-Base S to start using a position defined in the Position manager, select the checkbox next to the desired position, then click Use selected position.

  • Page 29: Downloading And Converting The Internally Logged Correction Data

    Clicking the Retrieve data button on the Status page opens the window above. Select a file from the list and click Ok to download it from the RT-Base S to a PC. Once downloaded, NAVbase gives you the option to convert the binary file into RINEX for use in post-processing.
  • Page 30 Figure 20. Binary to RINEX conversion after download The window above will appear once binary logged files have successfully been downloaded from the RT-Base S via NAVbase. Oxford Technical Solutions...

  • Page 31: Attaching The Second Modem

    RT-Base S User Manual Attaching the second modem The second radio modem (located in the lid of the RT-Base S) should to be connected to your mobile OxTS equipment—there should be a compatible connector built into the user cable supplied with that system.

  • Page 32: Changing The Differential Correction Format

    GNSS receivers. The RT-Base S supports several differential correction formats. Please note: By default, the RT-Base S uses the RTCMv3 standard for transmitting its differential corrections. You do not need to change the differential correction format unless you have a GLONASS-capable equipment and a GLONASS base station.
  • Page 33 RT-Base S User Manual  RTCM1012 (extended L1/L2 GLONASS pseudo-range and carrier-phase). Frequency 1 Hz.  RTCM1005 (base station antenna position). Frequency 0.1 Hz.  RTCM1007 (extended antenna descriptor and set-up information). Frequency 1 Hz. The base station firmware always configures the base station antenna as a Novatel GNSS-702-GGL.

  • Page 34: Repeatability

    1 cm.  If the RT-Base S is used one day, packed up then returned to the same location the next day. It is very hard to replace the tripod in the same location. It is better to have a pole that is fixed to the ground if you intend to use the same surveyed location on several days.
  • Page 35 RT-Base S User Manual Figure 22. Averaging to a different position example The problem of averaging to a different position happens each time that the RT-Base S goes through its averaging process. There is nothing magical about the RT-Base S that allows it to get its own position accurate to 2 cm or better.

  • Page 36: Revision History

    Revision history Table 7. Revision history Revision Comments 151102 Initial Version. 151112 Update for product names. Oxford Technical Solutions...

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