VBOX 3iS

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VB3iS - Vbox - Speed Sensors | ZenMicroSystems

The VBOX 3iS is a compact GNSS-aided Inertial Navigation System that also utilises wheel speed data from the vehicle’s CAN bus.

In areas with limited or no satellite signal (such as tunnels or test tracks surrounded by trees), the VBOX 3iS can fill in the gaps for prolonged periods of time – allowing you to continue testing without having to worry about erroneous data.

test-plot_680 - Vbox- 3is

The VBOX 3iS connects to your data logger via Serial or CAN and offers highly accurate position, speed, acceleration and attitude data in almost any environment. It is therefore an extremely cost-effective solution for ADAS validation and autonomous vehicle testing, and can also be used for conducting performance, braking and benchmarking tests.

For ADAS applications, connecting to another VBOX 3i RTK device enables the VBOX 3iS to act as a moving target and with RTK enabled, is capable of achieving 2 cm accuracy.

In areas with poor satellite visibility, such as in car parks, tunnels and dense, urban environments, combining wheel speed information with the GNSS and inertial data makes a huge improvement to the accuracy of the estimated speed and position.

As seen in this video, we were able to achieve sub 50 cm accuracy throughout the car park.

Thanks to a 100 Hz multi-constellation GNSS engine and the tracking of both the GPS and GLONASS networks of satellites, the VBOX 3iS ensures the accuracy of the data being captured even in restricted sky view conditions.

In this situation, the VBOX 3iS removes the need to fit expensive external wheel speed sensors that are difficult to fit and vulnerable to damage, by using the existing CAN bus information from the vehicle. Thanks to our comprehensive Vehicle CAN database, this is quick and easy to do as you can simply download the CAN file for each vehicle you are testing.

The VBOX Speed Sensor Dual Antenna has a host of features which makes it a very powerful and flexible vehicle testing equipment.

  • Compact GNSS-aided inertial navigation system, with wheel sensor interface
  • Available with RTK for 2 cm positional accuracy when used with an RTK Base station / NTRIP modem
  • Helps fill GNSS gaps and maintains position and velocity measurements in areas with poor GNSS
  • Connects to your existing control system or data logger
  • Ideal for use in multi-vehicle, multi-target ADAS testing
  • High performance 100 Hz GPS and GLONASS receiver
  • Compatible with steering robots
  • Built-in OLED display for easy configuration and diagnostics

As the VBOX 3iS has an internal IMU that is used for GNSS/IMU integration, the unit needs to be mounted securely to ensure optimum performance.

You can easily mount the VBOX 3iS inside a vehicle using our bespoke mounting kit. Consisting of a bracket (RLACS291) that simply attaches to the VBOX IMU mounting prop (RLACS212-V2), the solution fits many vehicle types without modification and can be installed and removed very quickly. We recommend that the VBOX 3iS is mounted vertically, towards the bottom of the pole.

GNSS SPECIFICATIONS

ABSOLUTE POSITIONING

  • Accuracy: 3 m (95 % CEP*)
  • Accuracy with SBAS DGNSS: <1.8 m (95 % CEP*)
  • Accuracy with RTCM DGNSS Base Station: 0.4 m (95 % CEP*)
  • Accuracy with RTK Base Station: 0.02 m (95 % CEP*)
  • Update rate: 100 Hz
  • Height accuracy: 6 m (95 % CEP*)
  • Height accuracy with DGNSS: 2 m (95 % CEP*)

*Circle of Error Probable
95% of the time the position readings will fall within a circle of the stated radius.

DISTANCE

  • Accuracy: 0.05 % (<50cm per Km)
  • Update rate: 100 Hz
  • Resolution: 0.078 mm

ACCELERATION

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

TIME

  • Resolution: 0.01 s
  • Accuracy: 30 ns

HEADING

  • Resolution: 0.01°
  • Update Rate: 100 Hz

BRAKE STOP ACCURACY (TRIGGER ACTIVATED)

  • Accuracy: +/- 1.8 cm**

(based on <50 m brake stop distance)

ROLL & PITCH ANGLE ACCURACY

  • Pitch Angle: 0.06° RMS
  • Roll Angle: 0.06° RMS

IMU SPECIFICATIONS

GYROSCOPES (ANGULAR RATE SENSORS)*

  • Dynamic range: ±450°/s
  • Nonlinearity: 0.01% FS
  • Resolution: 16 bit ADC (0.014°/s)
  • Bandwidth: 50 Hz
  • Noise density: 0.01 °/s/√Hz
  • Bias stability: ±0.003 °/s
  • Bias repeatability (1 year): 0.2 °/s

ACCELEROMETERS

  • Dynamic range: ±20 g
  • Nonlinearity: 0.1 % FS
  • Resolution: 16 bit ADC (0.15 mg )
  • Bandwidth: 50 Hz
  • Noise density: 60 µg/√Hz
  • Bias stability: 15 µg
  • Bias repeatability (1 year): 0.005 g
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