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RACELOGIC Support Centre

10 - Base Station Receiving Local DGPS

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In order to receive DGPS corrections from the Base Station, the VBOX will need to be connected to a Racelogic telemetry modem that matches the type used in the Base Station setup. Example connections for VBOX 3i and VBOX II are as follows.

Hardware Configuration

Example of Local DGPS operation with VBOX 3i

VBOX receives RTCM correction data from radio module. Radio module acts as receiver for information transmitted by Racelogic DGPS Base Station.
 

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Example of Local DGPS operation with VBOX II

VBOX receives RTCM correction data from radio module. Radio module acts as receiver for information transmitted by Racelogic DGPS Base Station.
 

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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, but an RLCAB096L would be used which has a 15 way D-Sub connector for connection to the SATEL radio modem.

Software Configuration

In addition to connecting the radio modem to the VBOX, it is also necessary to inform the GPS engine that it must use the correction data in its calculations.
 

VBOX Tools and VBOX Setup software has options to enable the DGPS corrections in any VBOX II, VBOX III or VBOX 3i connected to it. The mode selection will be chosen to reflect the Base Station mode that is being used, and the baud rate to reflect the type of radio modems and data baud rate being used. If your VBOX is not enabled for RTK (2 cm) or 20 cm then this will not work and an error message will confirm this. Once configured, you can then close the software program before disconnecting the VBOX.

VBOX Tools

To enable DGPS in a VBOX II, VBOX III or VBOX 3i, simply run the VBOX Tools software with the VBOX connected to the required COM port as usual, and then click on ‘VBOX Setup’.

The software will take a few seconds to communicate with the VBOX and open the VBOX Setup screen shown on the right. Once this appears, click on ‘GPS’, and then set the correct DGPS ‘Mode’ and ‘DGPS port RS232 Baud rate’ as shown in the drop down menus.

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VBOX Setup

To enable DGPS in a VBOX II, VBOX III or VBOX 3i, simply run the VBOX Setup software and select the COM port that the VBOX is connected to. VBOX Setup then automatically connects to the selected device.

The software will take a few seconds to communicate with the VBOX and open the VBOX Setup screen shown on the right. Once this appears, click on ‘GPS’, and then on the 'Settings' tab set the correct DGPS ‘Mode’ and ‘RS232 baud rate’ shown in the area highlighted red.

VBOX Manager Configuration

A VBOX Manager can also be used to enable the correct DGPS mode. Within the menu, enter 'SETUP', select 'VBOX' and then 'DGPS MODE'. Select the correct DGPS mode from the available options. Select 'BACK' and then select 'DGPS RS232 RATE' within the 'VBOX' menu. Choose the correct DGPS baud rate and select 'EXIT' to return to main menu.

 

Checking that you have DGPS Lock

VBOX Tools

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No data

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2 cm RTK fix

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Receiving data but not yet fixed

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Differential fix

VBOX Test Suite

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No data

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GNSS fix

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GNSS DGPS (inc RTCMv2 40 cm) fix

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Receiving data but not yet fixed

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2 cm RTK fix

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GNSS receiver position is fixed/locked

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Position is being computed from the Kalman filter as GNSS is lost

From approximately July 2004, all VBOX units have been shipped with DGPS reception enabled. However, VBOX units supplied before this date will require a small hardware modification to be carried out by Racelogic to accept the DGPS information via the radio modem. Please contact Racelogic for more information.