VBOX 3i-v4 100Hz Dual Antenna Data Logger
for Vehicle Dynamics Measurement
Slip Angle measurement has never been as accurate!
By using two GPS + GLONASS engines configured in
a 'Fixed Baseline RTK setup', VBOX 3i Dual Antenna (VB3iSL) combines high level
accuracy and test repeatability with 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
Higher accuracy with GPS and GLONASS
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
More about GPS accuracy.
Slip and Pitch/Roll measurement using two antennas
Utilising two GPS/GLONASS antennas, the VB3iSL
measures all of the normal VBOX GPS parameters, plus the
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, show real time graphs of speed against time, set up slip angle data
and calculate antenna locations. A
Dual Antenna Mounting Pole (max. width 2.5m) ensures the most accurate
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
- 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
- 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
- Logging rate selectable to 100Hz,
50Hz, 20Hz, 10Hz, 5Hz, 1Hz
- Wide 7V to 30V operating range
- Low current consumption
VBOX 3i is compatible with all existing
Telemetry Systems and
Display Overview for more information.
VBOX 3i Dual Antenna can be used for a multitude
of test applications such as
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.
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:
We also offer complete packages of hardware for
Inputs / Outputs
- 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, head ing & position). Velocity and heading are calculated via
Doppler Shift in the GPS carrier signal, providing you with unparalleled
- 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
- Base Station Radio Link
Can be used in conjunction with an RTK
differential Base Station to obtain centimetre-level positional
- 2x CAN Bus
Two CAN Bus interfaces are available. The first CAN Bus connections allows
data to be logged from 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
- 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.
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.
VBOX 3i USB connector can be
used for VBOX configuration and to output real-time data at 100Hz to a PC.
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 20kmh.
- 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.
VBOX 3i Dual Antenna measures the
following parameters at 100 samples per second:
- Vertical velocity
- Longitudinal velocity
- Lateral velocity
- 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
By adding data from an IMU additional benefits
can be achieved, such as:
- Logging pitch
and roll angle in real time
- Improved yaw rate and slip angle
- Resilience against GPS dropouts
Many other external parameters can be logged
- by using the four high resolution analogue
inputs built into the unit
- from a number of versatile Racelogic
VBOX Input Modules
- or directly from the CAN bus of the vehicle
using the Racelogic
Vehicle CAN Database.
All specifications refer to VBOX 3i Dual Antenna
- Accuracy: 0.1 Km/h
(averaged over 4 samples)
- Units: Km/h or Mph
- Update rate: 100 Hz
- Maximum velocity: 1000 Mph
- Minimum velocity: 0.1 Km/h
- Resolution: 0.01 Km/h
- Latency: 8.5 ±1.5 mS****
- Accuracy: 3m *
- 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: 6 Metres *
- Height accuracy with DGPS: 2 metres
- Accuracy: 0.05 % (<50cm per Km)
- Units: Metres / Feet
- Update rate: 100 Hz
- Resolution: 1 cm
- Accuracy: 0.50%
- Maximum: 20 G
- Resolution: 0.01 G
- Update rate: 100 Hz
Accel/Brake Test Time
(Multifunction Display /
- Resolution: 0.01 s
- Accuracy: 0.01 s
(OLED Display /
- Resolution: 0.01 s
- Accuracy: 0.01 s **
Brake Stop Accuracy
- Accuracy: ± 1.8 cm
(for a typical 100-0 kph brake stop)
- Resolution: 0.01°
- Accuracy: 0.1°
- Compact Flash: Type I
- Recording time: Dependent on flash
- Input Voltage Range: 7 – 30V DC
- Power: Max. 5.5 Watts
Slip Angle Accuracy
- <0.2° rms at 0.5m antenna
- <0.1° rms at 1.0m antenna
- <0.067° rms at 1.5m antenna
- <0.05° rms at 2.0m antenna
- <0.04° rms at 2.5m antenna
Pitch/Roll Angle Accuracy
- <0.14° rms at 0.5m antenna
- <0.07° rms at 1.0m antenna
- <0.047° rms at 1.5m antenna
- <0.035° rms at 2.0m antenna
- <0.028° rms at 2.5m antenna
Environmental and Physical
- Weight: Approx. 900 grams
- Size: 170 x 121 x 41mm
- Operating temperature: -20°C to
- Storage temperature: -30°C to +80°C
* 95% Circle of Error Probable (CEP) = 95% of the time the position readings
will fall within a circle of the stated radius. 2cm accuracy requires an RTK
option and RTK enabled Base Station.
** Not using DGPS and crossing the start/finish line at 100km/h.
*** Approximately 29Mb per hour used when logging GPS data at 100Hz; Approx.
182Mb per hour total logging capacity.
**** 15.5 mS with fixed CAN Delay.
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