VBOX 3i RTK | ADAS Testing

HomeVBOX 3i RTK | ADAS Testing

The VBOX 3i RTK is an RTK enabled version of the VBOX 3i Dual Antenna which can be used in conjunction with an RTK differential Base Station to obtain ±2cm positional accuracy.

This top-of-the-range data logger combines all the advantages of a twin antenna GPS setup with GLONASS satellite tracking and can be used in any number of vehicle tests where positional accuracy and repeatability are of the utmost importance.


For tests where positional accuracy is of key importance, like lane departure testing, distance to a fixed object, or precise mapping, the VBOX 3i RTK offers industry-leading 2cm positional accuracy, in real time, at 100Hz!

VBOX 3i RTK is the key data acquisition unit of the RACELOGIC ADAS Test Systems for measuring vehicle separation, time to collision, position within a lane, and more to 2cm precision.


Utilising two GPS/GLONASS antennas, the VBOX 3i RTK measures all of the normal VBOX GPS parameters, plus the azimuth and elevation between the antennas, i.e. the direction the antennas are pointing, and the angle between them measured from the horizontal. This allows the unit to measure slip angle, and also pitch angle (or roll angle depending on how the antennas are mounted), all at 100Hz.

Both the VBOX and the Base Station track the Russian GLONASS range of navigation satellites as well as the normal GPS constellation, using almost twice as many measurements for accurate results and reception in areas of poor satellite visibility. Read more on VBOX GPS accuracy.



VBOX 3i Dual Antenna RTK comes with a VBOX Manager, a display enabling you to change the dynamic modes and filter settings, set up slip angle data and define antenna locations.

A Dual Antenna Mounting Pole (needs to be ordered separately) ensures optimum antenna separation and the most accurate attitude measurement.

The VBOX 3i Dual Antenna RTK is our top of the range GPS data logger:

  • Better than 2cm positional accuracy with an RTK Base Station.
  • ±5cm vehicle separation accuracy when used as part of a Moving Base setup.
  • Measures slip angle, pitch (or roll) angle and yaw rate at 100Hz.
  • Twice as many satellites tracked using GPS + GLONASS.
  • Very low latency: 8.5 ±1.5 mS.
  • 4 x 24bit differential analogue input channels with ±50v input range and synchronous capture.
  • Over sampled brake/event trigger input (25nS accuracy)
  • Logs up to 16 channels of Vehicle CAN simultaneously
  • Real-time result display via serial, USB or Bluetooth
  • Audio voice tagging with microphone included
  • Data logged to compact flash memory card
  • User configurable logging conditions
  • Wide 7V to 30V operating range
  • Low current consumption

VBOX 3i can be combined with a wide range of VBOX modules, telemetry systems and displays.

Centimetre-level position accuracy can be used for a number of standard industry tests. For example:

  • Lane Departure Warning – 2cm accuracy combined with synchronised video.
  • Adaptive Cruise Control – 2cm vehicle to vehicle accuracy.
  • Collision Avoidance Systems – Vehicle to point, vehicle to vehicle.
  • Blind Spot Detection – Calibrated video overlay.
  • Rear Cross Traffic Detection Testing.

In addition:

  • Track Mapping and Route Profiling – Height is also improved to within ±2cm
  • Driving Line Analysis – Precise track position allows the ultimate analysis

The VBOX Tools software analysis package allows you to carry out sophisticated tests in real-time and in post processing.

All parameters can be viewed in a customisable graph, and the data can be scanned, analysed and manipulated using the very powerful Report Generator function.

RepGen is very customizable, allowing results to be produced for virtually any type of automotive test. All created configurations can be saved and easily recalled for future analysis.

VBOX Tools is able to load signal data from an industry standard CAN database file (.DBC).


  • 100Hz GPS / GLONASS Engine
    VB3iSLR features a powerful GPS engine embracing two antennas and capable of providing 100Hz signal up date rate for all GPS/GLONASS parameters (i.e. velocity, heading & position). Velocity and heading are calculated via Doppler Shift in the GPS carrier signal, providing you with unparalleled data accuracy.
  • 2x GPS/GLONASS Antennas
    All standard parameters like time, speed, distance, and position are measured at the primary antenna. The secondary antenna enables logging of additional channels like slip angle, pitch or roll angle (depending on antenna orientation).
  • Base Station Radio Link
    Can be used in conjunction with an RTK differential Base Station to obtain centimetre-level positional accuracy.
  • 2x CAN Bus
    Two CAN Bus interfaces are available. The first CAN Bus connections allows data to be logged from external RACELOGIC modules such as TC8 and FIM03. The second CAN Bus interface allows you to log up to 16 CAN signals from a different CAN source (e.g. Vehicle CAN Bus, laser height sensors, or steering wheel sensor). VBOX Tools analyisis software is able to load signal data from an industry standard CAN database file (.DBC).
  • Brake Trigger
    By using a physical pressure switch on the brake pedal, a precise ‘start of braking event’ can be captured. The brake/event trigger input is oversampled to 25nS for high distance accuracy.
  • Log Switch
    A start/stop logging switch allows users to manually choose when they wish to record data.
  • 4x Analogue Inputs
    Each of the four analogue input channels have a dedicated 24bit analogue converter. Data is recorded from each channel simultaneously to avoid latency between analogue channel data. The name, scale and offset of each analogue input channel can be adjusted using VBOX Tools software to allow sensor calibration and therefore logging of data in standard SI units. The analogue input connector also provides two power outputs that may be used for driving sensors. These are in the form of a 5v DC isolated supply and an output equal to the VBOX power supply voltage. Log rates can be set to either 100Hz or 500Hz.
  • Voice Tagging
    VBOX 3i can record a GPS synchronised WAV audio tag up to 30 seconds long to a time accuracy of 0.5 sec. The recorded WAV file is then logged to the CF card.
  • Power Supply
    VBOX 3i can accept a supply voltage between 7 to 30V DC. Low current consumption results in extended battery life.


  • CAN Bus
    One of the two VBOX CAN ports can be used to output VBOX GPS parameters plus any 12 channels from connected input modules or internal AD channels. The baud rate and CAN id’s for these outputs are user configurable.
  • RS232
    The RS232 connector is used for VBOX configuration and output of real-time GPS data. Provides the facility to connect to a radio telemetry system to offer PC monitoring of test data.
  • USB
    VBOX 3i USB connector can be used for VBOX configuration and to output real-time data at 100Hz to a PC.
  • Bluetooth
    VBOX 3i comes equipped with an internal Bluetooth Radio allowing remote configuration and remote output of real-time GPS data to any Bluetooth capable PC or Data logger. The Bluetooth connection is capable of sending data at the full 100Hz rate.
  • 2x Digital Outputs
    The first digital output is assigned to ‘Speed/Distance’ with adjustable ‘Pulses per Meter’ setting, while the second output is a level switch output enabling users to select any one of the logged channels and assign it a threshold value, e.g. output high (5V) when speed greater than 20kph.
  • 2x Analogue Outputs
    Both 16bit analogue outputs can be configured to output velocity (or other GPS parameters) for use by additional data logging equipment. The voltage output range is from 0 to 5v DC with a resolution of 76 μV per bit.
  • CF Card
    Data is logged in a space-delimited text format. Recording time dependent on flash card capacity, log frequency, number of channels and logging conditions. Approximately 29Mb per hour used when logging GPS data at 100Hz; approx. 182Mb per hour total logging capacity. Please note that only compact flash cards up to 32GB are supported.

VB3iSLR measures the following parameters at 100 samples per second:

  • Time
  • Position
  • Velocity
  • Vertical velocity
  • Longitudinal velocity
  • Lateral velocity
  • Heading
  • True heading
  • Height
  • Lateral acceleration
  • Longitudinal acceleration
  • Slip angle
  • Pitch angle
  • Yaw rate
  • Radius of turn
  • Centreline deviation
  • Distance between two cars

All specifications refer to VBOX 3i Dual Antenna RTK (RLVB3iSLR – IMU04 ready).


  • Accuracy: 0.1Km/h
    (averaged over 4 samples)
  • Units: Km/h or Mph
  • Update rate: 100Hz
  • Maximum velocity: 1000Mph
  • Minimum velocity: 0.1Km/h
  • Resolution: 0.01Km/h
  • Latency: 8.5 ±1.5mS****





  • Accuracy: 0.05% (<50cm per Km)
  • Units: Metres / Feet
  • Update rate: 100Hz
  • Resolution: 1cm


(Multifunction Display / VBOX Tools)

  • Resolution: 0.01s
  • Accuracy: 0.01s



  • Accuracy: ± 1.8cm
    (for a typical 100-0 kph brake stop)



  • Compact Flash: Type I
  • Recording time: Dependent on flash card capacity***



  • <0.2° rms at 0.5m antenna separation
  • <0.1° rms at 1.0m antenna separation
  • <0.067° rms at 1.5m antenna separation
  • <0.05° rms at 2.0m antenna separation
  • <0.04° rms at 2.5m antenna separation



  • Weight: Approx. 900 grams
  • Size: 170 x 121 x 41mm
  • Operating temperature: -20°C to +70°C
  • Storage temperature: -30°C to +80°C


  • Accuracy: 2m*
  • Accuracy with SBAS DGPS: >1m*
  • Accuracy with EGNOS DGPS: 70cm*
  • Accuracy with WAAS DGPS: 1.5m*
  • Accuracy with RTCM DGPS: 80cm*
  • Accuracy with RTK DGPS: 2cm*
  • Update rate: 100Hz
  • Resolution: 1.8mm
  • Height accuracy: 6m*
  • Height accuracy with DGPS: 2m*
  • Height accuracy with RTK DGPS: 2cm*



  • Accuracy: 0.50%
  • Maximum: 20G
  • Resolution: 0.01G
  • Update rate: 100Hz


(OLED Display / VBOX Tools)

  • Resolution: 0.01s
  • Accuracy: 0.01s**



  • Resolution: 0.01°
  • Accuracy: 0.1°



  • Input Voltage Range: 7 – 30V DC
  • Power: Max. 5.5 Watts


Pitch/Roll Angle Accuracy

  • <0.14° rms at 0.5m antenna separation
  • <0.07° rms at 1.0m antenna separation
  • <0.047° rms at 1.5m antenna separation
  • <0.035° rms at 2.0m antenna separation
  • <0.028° rms at 2.5m antenna separation
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