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OXTS GPS-Base User Manual

Gps base station
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GPS-Base
GPS
Base
Station
GPS-Base

User Manual

Confidently. Accurately.

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Summary of Contents for OXTS GPS-Base

  • Page 1: User Manual

    GPS-Base Base Station GPS-Base User Manual Confidently. Accurately.
  • Page 2 Document Revision: 131025 (See Revision History for detailed information). Contact Details Oxford Technical Solutions Limited 77 Heyford Park Upper Heyford Oxfordshire OX25 5HD England Tel: +44 (0) 1869 238 015 Fax: +44 (0) 1869 238 016 http://www.oxts.com mailto:info@oxts.com Oxford Technical Solutions...

  • Page 3: Table Of Contents

    GPS-Base User Manual Table of contents Introduction   Overview   Correction types   File logging   Features   Scope of delivery   Specification     Warranty Conformance notices   Regulatory testing standards   Operation and configuration   Choosing a suitable location  ...
  • Page 4 Communication   Latitude, longitude, altitude   Base Station ID   Logging Novatel binary   Logging RTCM V3   Save position to file   Start logging   LED status   SATEL radio status   Freewave radio status   Discussion on repeatability  ...

  • Page 5: Introduction

    GPS. The position accuracy of differential and RTK GPS receivers is improved when using the GPS-Base. Four models of the GPS-Base exist, as listed in Table 1. All models are identical in their operation but are able to track different satellite signals.

  • Page 6: Correction Types

    GPS in the car also has to figure out the difference in the number of carrier- phase cycles between the GPS-Base and the car. The GPS-Base measures the carrier- phase of the signals from each satellite and transmits it to the car.

  • Page 7: File Logging

    More detailed information on the different formats is given at the end of the manual in the section called “Differential correction format details”. File logging The GPS-Base software can log data on to the hard disk of the PC. Files can be logged in Novatel binary format and in RTCM V3 format. Features The GPS-Base is a self-contained unit that includes: ...
  • Page 8 Table 3. Overview of different radios Radio Specification SATEL 380 - 480 MHz band, up to 1 W, typically 5 km. License free bands available for many European countries. Radio will typically cover 8 bands with 25 kHz channel spacing. SATEL 869 MHz band, up to 500 mW, typically 2 km.

  • Page 9: Scope Of Delivery

    GPS-Base User Manual Scope of delivery Table 4, and Table 5, list all the items that are delivered with a GPS-Base and the respective radio modem. The customer must check that the radio can be used without a license or obtain a suitable license before using the GPS-Base.
  • Page 10 Table 5. Summary of the GPS-Base components with Freewave radio Description GPS-Base unit GPS-C006 15m GPS antenna cable GPS-702-GG GPS antenna Freewave FGR-115RC 900 MHz radio 14C0044B Freewave radio cable Car antenna (short) with 20ft cable Base-station antenna (long) with 20ft cable...

  • Page 11: Specification

    GPS-Base User Manual Specification The technical specification of the GPS-Base unit is shown in Table 6, below. Table 6. Technical specification (except radio modem) Parameter Specification Power 6-18 V DC, 2 W Operating temperature -40 °C to +75 °C Environment...

  • Page 12: Warranty

    Warranty Oxford Technical Solutions Limited warrants the GPS-Base 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 13: Conformance Notices

    GPS-Base User Manual Conformance notices The GPS-Base complies with the radiated and conducted emission limits for CISPR 25 Level 2 and Class B of Part 15 of the FCC rules, and with the radiated emission and immunity limits for Class B of EN 61326. These limits are designed to provide reasonable protection against harmful interference in a residential installation.

  • Page 14: Operation And Configuration

    Follow these steps to operate your GPS-Base unit correctly. Choosing a suitable location For correct operation of the GPS-Base it is essential to locate the GPS antenna in a location where it has a full view of the sky, down to an elevation of 10 degrees in all directions.
  • Page 15 Connect the radio modem aerial to the radio aerial connector on the GPS-Base unit. OxTS has alternative aerials that are suitable for attaching to buildings and do not require a ground-plane under the aerial.

  • Page 16: Gps-Base Software

    Enter base-station location, if known c) Restore a saved base-station location d) Program a location in to the GPS-Base so it will use it after power is removed and restored e) Set the base-station identifier in to the GPS-Base...

  • Page 17: Choose Port

    GPS-Base appear as a serial COM port. Normally the driver will install three COM ports for the GPS-Base: COM5, COM6 and COM7. Any of these can be used. If these ports are taken by other software drivers then other ports will be used and it will be necessary to “search”...

  • Page 18: Remember This Port Selection

    If the GPS-Base cannot be found on the saved port then it will scan all the ports, which can take time. It is best to have the GPS-Base on and connected before starting the software.

  • Page 19: Average Position

    Figure 6. GPS-Base configuration page Average position Use this option to let the GPS-Base find its own position using GPS measurements. This is the most common option to use. For temporary installations a 3 minute period is sufficient. Longer periods can be used to find the location of the antenna more precisely.

  • Page 20: Enter Antenna Position

    Note that the altitude must be entered in EGM96, not WGS-84. Leave unchanged Use this option if the GPS-Base already knows its location and you do not want to change it. If the GPS-Base has a location stored internally, or a location has already been acquired during the session, this option will be selected automatically.

  • Page 21: Status Page

    By default the GPS-Base will transmit “OxTS” as the Base Station Identifier. Status page The Status page is used to monitor the GPS-Base. The GPS-Base does not need the PC software to be running continuously, once the GPS-Base is configured then the PC can be disconnected.

  • Page 22: Status

    Figure 8. GPS-Base status page Status The status parameter shows the status of the GPS-Base and the software. Valid values for this parameter are listed in Table 7. Oxford Technical Solutions...

  • Page 23: Communication

    Averaging The GPS-Base is averaging the GPS positions. RTCA OK This is the normal mode for the GPS-Base when it is working correctly and outputting RTCA corrections. RTCA2 OK This is the normal mode for the GPS-Base when it is working correctly and outputting RTCA2 corrections.

  • Page 24: Logging Rtcm V3

    Use this option to store the current antenna location internally on the GPS-Base. When a location is stored in the GPS-Base, there is no need to re-configure it every time it is used. Simply turn the GPS-Base on, without connecting it to a computer, and it will start transmitting corrections using the saved antenna location and differential correction format.

  • Page 25: Start Logging

    GPS-Base User Manual Start logging Use this option to start logging the raw GPS measurements from the GPS-Base. Once started the “Start Logging” button will become “Stop Logging” which will stop the logging of the raw GPS measurements when pressed. While logging it is not possible to change page or quit.

  • Page 26: Led Status

    LED status Some of the radios provided with the GPS-Base have LEDs that show what the radio is doing. SATEL radio status This section only applies to the SATEL radio option. The GPS-Base will start outputting corrections when the antenna location has been found or entered. When transmitting corrections, the LEDs on the SATEL modem will be as shown in Table 8.
  • Page 27 LED is available. If differential corrections are not being received by the RT then check that the differential correction format on the GPS-Base and on the RT are the same. Revision: 131025...

  • Page 28: Discussion On Repeatability

    GPS receivers will also be wrong. They will be correct relative to the base-station, but they will have the same error on the earth that the base-station has. This is important when turning the GPS-Base off and on again. See Figure 10.
  • Page 29 1cm.  If the GPS-Base 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 30: Differential Correction Format Details

    Integer positioning mode when using the RTCA2 format of the GPS-Base. Table 10, Table 11 and Table 12 list the messages output by the GPS-Base for each correction type. These are the corrections required for OxTS products. When using the GPS-Base with other products check that the other GPS receiver supports these messages and can operate in the desired mode using them.
  • Page 31 GPS-Base User Manual Table 12. RTCM V3 messages output by GPS-Base Message Period Purpose RTCM GPS differential corrections including carrier-phase and pseudo-range 1003 corrections. RTCM Base-station parameters information. 1006 RTCM Antenna information. 1007 RTCM GLONASS differential corrections including carrier phase and pseudo-range 1011 corrections.

  • Page 32: Revision History

    Revision history Table 13. Revision history Revision Comments 070330 Initial Version. 071128 Software Updates. 080916 Software Updates. 090917 Added Advanced Settings for Base Station ID. Added GLONASS options. 100812 Added RTCM V3 logging, RTCA2 and RTCM V3 correction outputs. Changed to new radio modem cable.

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