DGPS/RTK

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This page covers the DGPS/RTK configuration when you are setting up and configuring your VBOX system using VBOX 4 ADAS.

VBOX 4 units must have the correct DGPS mode enabled via the VBOX Setup Software before it is capable of receiving and using the DGPS correction information transmitted by a Local Base Station or an NTRIP service.

Using with Local DGNSS Base Station

2 cm positional accuracy:

If you use VBOX 4 ADAS with a Base Station (RLVBBS5 or RLVBBS6), the positional accuracy will increase to 2 cm.

RTCM v3 - 2 cm correction (RTCM standard message type) RECOMMENDED
Racelogic - proprietary 2 cm correction
CMR - 2 cm correction (Trimble standard message type)

RTCM v3 is recommended as the default RTK 2-cm correction type. This message format is a globally recognised type and is more resilient to data loss caused by radio errors.

RTK

The receiver automatically detects the format of the differential corrections (RTCM or CMR) and switches between standalone, DGPS or RTK modes according to the type of corrections it receives.

Setup using VBOX Setup

Run the latest VBOX Setup software.
Select the correct COM Port and go to the GNSS menu.
Go to the DGPS option and select the correct DGPS mode and baud settings from the available options.
Select Write to unit to upload the new settings to the VBOX 4 unit.

Solution type lookup

0 = None

GNSS receiver cannot compute a solution for position.

1 = GNSS only

Position computed from GNSS only.

2 = GNSS DGPS

Position computed from assisted GNSS, this includes SBAS and Base Station DGPS corrections.

3 = 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.

4 = 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.

5 = Fixed position

GNSS receiver position is fixed/locked. This is primarily used for Base Station receivers.

6 = IMU Coast

Position computed from the Kalman filter when GNSS is lost, inertial data from the IMU is used to maintain a solution for position until the GNSS is re-established.