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AEB Car-to-Car Rear Stationary (CCRs)

Technical Articles July 27, 2018

The Euro NCAP test protocol for AEB CCRs evaluates the performance of systems as the test vehicle approaches a stationary global vehicle target (GVT), which in this case will normally be a soft target—balloon car. The test is conducted at incremental predefined speeds for both City and Inter-Urban tests and with differing amounts of lateral overlap between the centreline of the VUT and GVT. The test is conducted a number of times for each scenario and concludes when all tests are completed or the vehicle under test makes contact with the soft target.

Protocol accuracy requirements

Our RT and RT-Range Hunter products meet the requirements below and are well known for their consistency and reliability.

  • GVT and VUT axes to be in ISO 8855:1991 orientation
  • Lateral path error
  • Update rate at least 100 Hz
  • Time is required as a synchronisation DGPS
  • Position to 0.03 m
  • Speed to 0.1 km/h
  • Yaw velocity to 0.1°/s
  • Acceleration to 0.1 m/s²

Getting the measurements you need

To capture the test data, the vehicle under test is equipped with one of our automotive RT systems (the RT is a GNSS-aided inertial navigation system), which receives differential corrections from either a local base station or NTRIP server to achieve 1 cm accuracy. The RT accurately measures the position, orientation and velocity of the vehicle in all three axes at up to 250 Hz.

VUT drives towards balloon target

Measurements from the RT are passed via Ethernet to an RT-Range Hunter that is also installed in the test vehicle. The RT-Range Hunter performs real-time calculations using information from the RT and the geographic position of the static target (entered prior to the test). The availability of real-time measurements is extremely useful as allow test drivers to instantly verify test conditions and accuracies while on track.

Back at the office, data collected during the test is easily downloaded, processed, tested and exported in CSV format using software tools that are included free of charge for further analysis.

 

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