VBOX 3i Dual Antenna | 100Hz Vehicle Dynamics Measurement

HomeVBOX 3i Dual Antenna | 100Hz Vehicle Dynamics Measurement

A VBOX 3i Dual Antenna (VB3iSL) uses a GPS/GLONASS receiver to achieve high level accuracy and thanks to the twin antennas has the ability to measure slip and pitch/roll angles at 100Hz.

The system is so accurate that it can even detect the difference a side wind makes to the slip angle measurement, a feat that even the very best inertial systems cannot currently replicate. Watch a demo video here.


In addition to GPS, the VB3iSL tracks the Russian GLONASS range of satellites. The advantage of using both satellite constellations is that there are almost twice as many satellites in view, helping to maintain a robust satellite connection and increasing the accuracy of the system. More about GPS accuracy.


Utilising two GPS/GLONASS antennas, the VB3iSL 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. This system is ideal for vehicle dynamics testing.



The VBOX 3i Dual Antenna 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 (max. width 2.5m) ensures the most accurate attitude measurement.

Video demonstrating pitch and roll angle measurement using the VBOX 3i Dual Antenna and IMU04.

The VBOX 3i Dual Antenna has a host of features which makes it a very powerful and flexible vehicle testing data logger.

  • Simultaneous measurement of Slip Angle, Pitch or Roll Angle, Yaw Rate, True Heading, Lateral Velocity and Longitudinal Velocity
  • 100Hz data logging using GPS and GLONASS
  • Very low latency: 8.5 ±1.5 mS
  • Oversampled brake/event trigger input (25nS accuracy)
  • 4x analogue inputs
  • 1x default CAN Bus port for input module expansion
  • 1x configurable CAN Bus for vehicle CAN interface or VBOX data output
  • Easy to fit and transport
  • Real-time result display via serial, USB or Bluetooth
  • Audio voice tagging
  • Data logged to CF memory card
  • User configurable logging conditions
  • Logging rate selectable to 100Hz, 50Hz, 20Hz, 10Hz, 5Hz, 1Hz
  • 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.

VBOX 3i Dual Antenna can be used for a multitude of test applications such as

  • Brake Testing
  • Handling & Dynamics (ESC Testing, Aquaplane, Centreline Deviation, Lane Change)
  • ADAS & Safety Systems Testing
  • Performance Testing (Coastdown, Pass-by-Noise, Speed & Distance Verification) and more.

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.

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


There are a number of standard test configurations which can be loaded into the software with one button click:

  • Brake Testing – Using a brake pedal mounted trigger input, VB3iSL will measure braking distance to within ±1.8cm.
  • Performance Testing – This unit is perfect for all variations of performance testing, the accuracy and quick response of the 100Hz unit gives very repeatable and accurate results.
  • Acceleration Testing – Instantly view speed versus time & distance tables.
  • Circuit Testing – Extract and analyse lap information.
  • Dynamic Tests – Slip and pitch angles updated at 100Hz alongside speed, distance and acceleration.
  • Steady State Cornering – Slip angle without any drift or correction over time.
  • Trailer Angles – Measure relative angles between two fixed bodies (two systems needed)
  • Accident Reconstruction – Log and animate the vehicle’s movement in three axis

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.

For customers with focused test requirements, we offer dedicated software packages to simplify the test procedure:

  • Aquaplane
  • Coastdown
  • Lane Change
  • Centreline Deviation


We also offer complete packages of hardware for specific tests:

  • Test and Validation of Advanced Driver Assistance Systems (ADAS)
  • Lane Departure Warning – 2cm accuracy combined with calibrated video overlay
  • Adaptive Cruise Control – 2cm vehicle to vehicle accuracy
  • Collision Avoidance Systems – vehicle to point, vehicle to vehicle
  • Blind Spot Detection – Calibrated Video Overlay


  • 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).
  • 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.

VBOX 3i Dual Antenna measures the following parameters at 100 samples per second:

  • Time
  • Position
  • Velocity
  • Vertical velocity
  • Longitudinal velocity
  • Lateral velocity
  • Height
  • Heading
  • True heading
  • Lateral acceleration
  • Longitudinal acceleration
  • Distance between two cars
  • Centreline deviation
  • Slip angle
  • Pitch angle or roll angle, depending on antenna orientation
  • Yaw rate
  • Radius of turn

All specifications refer to VBOX 3i Dual Antenna (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 ±1.5 ms****



  • 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 RTCM DGPS: 80cm*
  • Accuracy with RTK DGPS: 2cm*
  • Update rate: 100 Hz
  • Resolution: 1.8 mm
  • Height accuracy: 6m*
  • Height accuracy with DGPS: 2m*



  • 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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