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RACELOGIC Support Centre

06 - VBOX Touch RTK

VBOX Touch is available in an RTK variant, offering centimetre-level accuracy using the latest GNSS technology. Tracking the GPS, GLONASS, BeiDou and Galileo constellations, it offers robust position accuracy and precise measurements of speed and distance.
 

The device can receive RTK correctional signals using an NTRIP Modem or Telemetry Modem with a Static Base Station (BS6 only), meaning you can have up to 1 cm positional accuracy at a test track or on open roads. 
 

VBOX Touch RTK is pre-configured to receive serial RTK correction messages (RTCM v3.2 MSM4), meaning that there is no need to turn an RTK setting on, unless you are using an NTRIP Modem or wanting to change the baud rate/3rd tracked constellation.


IMPORTANT - The external antenna should be used when receiving NTRIP RTK corrections.

For more information on what DGPS is and how it works, click here. For more information on RTK, click here.

VBOX Touch Accuracy Comparison

The VBOX Touch RTK variant improves on the positional accuracy of the standard unit from 2.5 m to up to 1 cm. Trigger brake stop accuracy is also improved from ±20 cm to ±5 cm. More details on these accuracies can be seen below.

  VBOX Touch RTK VBOX Touch
Position Accuracy (Standalone) H: 1.5 m CEP H: 2.5 m CEP
Position Accuracy (with SBAS) H: 1 m CEP H: 1 m CEP
Position Accuracy (with RTK)
  • H: 1 cm + 1 ppm CEP
  • V: 1 cm + 1 ppm R50

n/a

Trigger Brake Stop Accuracy ±5 cm ±20 cm

Connection to an NTRIP Modem

Connect the RLCAB170 cable from the bottom Hirose connector on the NTRIP Modem to the bottom CAN/Serial port of the VBOX Touch. Ensure that the NTRIP Modem is correctly configured for use before connecting to the unit.
 

NTRIP Modem VBOX Touch.png

 

Connection to a Local DGNSS Base Station

VBOX Touch RTK receives RTCM correction data from a telemetry radio module which acts as receiver for information transmitted by the Racelogic DGNSS Base Station. It is connected to the bottom CAN/Serial port of the VBOX Touch via an RLCAB005.

Racelogic also provide solutions to use SATEL radio modems for long range applications on large test sites. The connection to the VBOX will be the same in this instance, however instead of an RLCAB005, an RLCAB096L would be used which has a 15 way D-Sub connector for connection to the SATEL radio modem.

Ensure that the Base Station is correctly configured for use before connecting to the unit.
 

VBOX Touch with Radio.png

Configuration

  1. Apply power to the unit and then go to the 'Settings' menu by selecting the Settings Button Settings.png on the bottom left of the screen.
 
  1. Choose the 'Serial Port Settings' and then navigate to 'RTK Input'.
     

VBOX Touch Receiver Settings1.png
 

  • If you are using an NTRIP Modem: Enable 'NTRIP Mode' and change the DGPS Baud Rate to '115200' by pressing on the corresponding button next to the options.
  • If you are using a Static Base Station: Ensure NTRIP Mode is 'Disabled' and then select the correct baud rate, this setting should be either '115200' for a Racelogic blue boxed radio or '38400' for a Satel grey boxed radio.
     
  1. It is also possible to change the 3rd tracked constellation between Beidou and Glonass if required by navigating to 'GNSS Selection' within the 'General Settings' screen. More information on this is available here.
     

VBOX Touch GNSS Selection.png

Checking You Have RTK Lock

The status of the DGNSS lock within a VBOX Touch RTK can be seen on screen via the Satellite Icon.

VBOX Touch No Sats.png Flashing Red - No satellite lock VBOX Touch Sats Lock.png Solid Green - Standalone positional accuracy; Code Diff/SBAS positional accuracy
VBOX Touch Sats Lock RTK Float.png Solid Orange - RTK Float VBOX Touch Sats Lock RTK Fix.png Solid Purple - RTK Fixed

The status is also available within the GPS Status area of the Diagnostics menu.
 

VBOX Touch RTK Fixed.png
 

  • SEARCHING FOR SATELLITES: The unit is searching for a valid satellite lock.
  • STANDALONE: Position computed from GNSS only.
  • CODE DIFF: Position computed from assisted SBAS corrections.
  • RTK FLOAT: Position computed from GNSS corrected by RTK. Float means the GNSS receiver is still calculating the integer ambiguity, a small error will be present on the position computation at this time.
  • RTK FIXED: Position computed from GNSS corrected by RTK. Fixed means the integer ambiguity is established and the optimum position correction is applied resulting sub 2 cm relative accuracy in good conditions.
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