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RACELOGIC Support Centre

03 - VB3iS VBOX Setup GNSS

The GNSS menu contains GNSS receiver information and provides the ability to set the dynamic mode, DGNSS mode, leap second, elevation mask, the minimum speed 'zero' value and to perform a GNSS coldstart.

Settings

VB3iS VBOX Setup GPS Settings.png

  1. GPS Information

VB3iS VBOX Setup GPS Settings Info.png
 

View information about the GNSS receiver and perform a GNSS coldstart, more information on this is available here.

Note: If you are performing a GNSS coldstart, VBOX Setup will need to be closed before the device will detect satellites again.

 
  1. GNSS Settings
Leap Second

The leap second value can be changed if required. This was increased to 18 seconds as of December 2016 - more information on this is available here.

 

Elevation Mask

Allows you to change the elevation mask, selectable from 10 – 25° (10° by default). If the testing area has nearby trees or buildings, you may benefit from increasing this value to reduce the effect of multipath. More information on this is available here.

Note: Increasing this value will reduce the number of satellites the VBOX will be able to use.

VB3iS VBOX Setup GPS Settings1.png
  1. GNSS Optimisation

VB3iS VBOX Setup GPS Settings Optimisation.png
 

This option allows you to change the sensitivity of the GNSS engine.

  • High dynamics (default) - For high dynamic applications such as brake stop testing.
  • Medium dynamics - Suitable for all other testing.
  • Low dynamics - For less dynamic applications, such as steady state speed measurement or coast down testing. 
  1. DGPS

VB3iS VBOX Setup GPS Settings DGPS.png
 

This option allows you to select whether the VB3iS uses differential GNSS. Use the dropdown menus to select the desired mode and baud rate.

  • Mode
    • None (default) - Differential GPS is off.
    • CMR (2 cm RTK) - 2 cm correction (Trimble standard message type).
      Only selectable with VB3iSR RTK variant.
    • RTCMv3 (2 cm RTK) - 2 cm correction (RTCM standard message type) RECOMMENDED.
      Only selectable with VB3iSR RTK variant.
    • NTRIP - Internet based subscription service, more information on this can be found here.
      Only selectable with VB3iSR RTK variant.
    • MB-Base - Mode for use in Moving Base ADAS applications.
      Only selectable with VB3iSR RTK variant.
    • MB-Rover - Mode for use in Moving Base ADAS applications.
      Only selectable with VB3iSR RTK variant.
    • RTCM (40 cm) - RTCM corrections are received by the VB3i via a Racelogic telemetry module and a locally placed Base Station. Contact Racelogic or your local agent for more details.
    • SBAS - SBAS differential corrections are received from the nearest Geo-stationary GPS-SBAS satellite.
       
  • RS232 baud rate - Sets the DGPS serial rate. To ensure that the VBOX receives the DGPS correction signal, the correct RS232 rate must be set. All Racelogic blue boxed radios use 115200 kbit/s, Satel grey boxed radios use either 19200 kbit/s or 38400 kbit/s.
 

Engineering diagnostics

This area is used to set non-standard settings in the GNSS engine. This Should only be used on advice from a VBOX support technician.
 

VB3iS VBOX Setup GPS Diagnostics.png

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