VBOX IISX Dual Antenna

HomeVBOX IISX Dual Antenna

The VBOX IISX Dual Antenna has all the features of a  VBOX IISX single antenna version, but contains a second GPS engine.

By using two GPS engines configured in a ‘fixed baseline RTK setup’, extra parameters such as slip and pitch angle (or in an alternative configuration roll angle) can be measured.

Due to its small size and simple installation, VBOX IISX is ideally suited for use in cars, bikes, off road vehicles and boats.

If you don’t want to use a Base Station, then the VBOX IISX range of GPS data loggers gives the highest ‘stand alone’ positional accuracy of our range, utilising the free WAAS/EGNOS correction service to give <1m positional accuracy.

Positional accuracies of 40cm (standard) or 20cm (optional) are also available when used in conjunction with a Racelogic DGPS Base Station.

The VBOX IISX has a host of features which makes it a very powerful and flexible vehicle testing data logger.

  • Logs onto an SD card at 20 times per sec
  • Measurement of slip angle, pitch/roll angle, yaw rate, true heading and velocity simultaneously
  • CAN interface for logging of vehicle data
  • CAN Bus interface: connect to all VBOX input modules
  • Logs up to 24 data channels in addition to up to 13 standard GPS channels
  • +/- 10cm brake distance accuracy
  • USB and RS232 serial interface
  • SD card logging
  • 2 x Analogue outputs + 2 x Digital outputs
  • Accurate brake/event trigger input
  • OLED screen display
  • Front panel configuration
  • Wide range of power input: 6 – 30V

VBOX IISX Dual Antenna can be used for a number of different applications:

  • Dynamic Tests
    Slip and pitch angles updated at 20Hz 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).
  • Brake testing
    Having a maximum update rate of 20Hz is still plenty fast enough for brake testing, you don’t quite get the phenomenal ±1.8cm resolution of the VBOX 3i, but for many purposes the ±10cm achieved is more than adequate. The VBOX IISX has a high speed brake trigger input, which scans for a braking event 100,000 times a second.
  • Performance testing
    This unit is perfect for all variations of performance testing, the accuracy and quick response of the 20Hz unit gives very repeatable and accurate results, when tested back to back with the VBOX 3i, they are within a few hundredths of a second every time.
  • Durability testing
    The lower sample rates of 5Hz and 10Hz make this unit suitable for long term testing where high speed logging is not required.
  • Driving line analysis
    The great positional accuracy and 20Hz update rate are perfect for professional level driving line analysis at an affordable cost.

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.

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

  • Brake Testing – distance, time, MFDD, corrected distance, trigger speed etc.
  • Acceleration Testing – instantly view speed versus time & distance tables.
  • Circuit Testing – extract and analyse lap information.

We offer dedicated software solutions for a number of specialised tests such as:

  • Aquaplane
  • Coastdown
  • Lane Change
  • Centreline Deviation


  • 2x GPS Antennas
    By utilising two GPS engines configured in a ‘fixed baseline RTK setup’, true heading, yaw rate, lateral and longitudinal velocity, slip angle and pitch angle can be measured, (slip is measured at the point at which you place the main reference antenna. This can be translated to any point on the vehicle in post processing). How does it work?
  • CAN Bus
    Data can be logged from external modules e.g. the Thermocouple Interface or the Frequency & Pulse Counter Input Module. Up to 16 CAN signals can also be logged from a different CAN source (e.g. Vehicle CAN Bus). When logging data from another source, VBOX Tools can load signal data from an industry standard CAN database file (.DBC).
  • Brake Trigger
    By using a physical switch on the brake pedal, a precise ‘start of braking event’ can be captured. This is required to capture true Stopping Distance to the accuracy quoted.
  • Power Supply
    VBOX IISX can accept a supply voltage between 6 to 30v DC. Low current consumption results in extended battery life.



  • CAN Bus
    By utilising spare CAN Bus connections VBOX GPS can transmit data while logging readouts from external module inputs.
  • RS232/ USB
    RS232 connector is used for VBOX configuration and output of real-time GPS data. A USB port is also present giving the same functionality for PC’s with USB sockets.
  • 2x Digital Outputs
    Both digital outputs can be configured to output velocity (or other GPS parameters) for use by additional data logging equipment.
  • 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.
  • SD Card
    Accepts most types of SD card. Data is stored in a standard PC format allowing fast transfer of data to a PC equipped with a SD card reader. The file format is an ASCII text file that can be loaded directly onto VBOX Tools software, or imported into Excel and other third party software.

VBOX IISX Dual Antenna measures the following parameters at 20 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

These specifications refer to VBOX IISX Dual Antenna.


  • Accuracy: 0.1 Km/h
    (averaged over 4 samples)
  • Units: Km/h or Mph
  • Update rate: 20Hz
  • Maximum velocity: 1000 Mph
  • Minimum velocity: 0.1 Km/h
  • Resolution: 0.01 Km/h
  • Latency: 30.5 ms (31.5ms when using twin antennas)


  • Accuracy: 0.05 % (<50cm per Km)
  • Units: Metres / Feet
  • Update rate: 20Hz
  • Resolution: 1 cm


(Multifunction Display / VBOX Tools)

  • Resolution: 0.01s
  • Accuracy: 0.05s



  • Accuracy: +/- 10cm




  • Compact Flash: Type I
  • Recording time: Dependant on SD capacity. Approx. 12.8 megabytes per hour used while logging all GPS and slip module channels.



  • <0.5° rms at 0.5m antenna separation
  • <0.25° rms at 1m antenna separation
  • <0.1° rms at 2m antenna separation


Yaw Rate RMS Noise

  • 0.75 degrees/second***



  • Weight: Approx. 690 grams
  • Size: 155mm x 108mm (decreasing to 99mm) x 45mm
  • Operating temperature: -30°C to +60°C
  • Storage temperature: -40°C to +85°C


  • Accuracy: 3m *
  • Accuracy with SBAS DGPS: <0.8m (Europe), <1.5m (USA and Asia) *
  • Accuracy with RTCM DGPS: 40cm *
  • Update rate: 20Hz
  • Resolution: 1.85cm
  • Height accuracy: 6m *
  • Height accuracy with SBAS: 2m *



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


(OLED Display / VBOX Tools)

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



  • Resolution: 0.01°
  • Accuracy: 0.1°



  • Input Voltage Range: 6 – 30V DC
  • Power: 9 watts
  • Current: Typically 560mA


Pitch/Roll Angle Accuracy

  • <1.0° rms at 0.5m antenna separation
  • <0.5° rms at 1m antenna separation
  • <0.25° rms at 2m antenna separation
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