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AEB Car-to-Car Rear Moving (CCRm)

Technical Articles July 11, 2018

The Euro NCAP test protocol for AEB CCRm tests how effective AEB/FCW systems are when approaching the rear of a slower-moving vehicle. The test is conducted at a range of Inter-Urban speeds using a towed or guided soft target to avoid damage in the event of a system failure. As well as testing at different speeds, the tests are also repeated with different amounts of lateral overlap between the vehicle under test (VUT) and global vehicle target (GVT). The test concludes when the speed of the VUT is less than the speed of the GVT or if there is contact between the VUT and GVT. 

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 RT and RT-Range from OxTS
  • 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 

AEB Car-to-Car Rear Moving (CCRm) tests with OxTS RT-Range

Getting the measurements you need 

To capture the measurements required for the AEB CCRm test, an RT is installed in the VUT and either in the vehicle towing the GVT or in/on the target itself. An RT-Range Hunter is then also installed in the VUT while an additional RT unit is installed in the GVT. Normally, a local base station is also used to send differential corrections to the RTs, allowing them to achieve RTK integer accuracy of 1 cm.

During testing, the RT in the target vehicle accurately measures position, speed and velocity, which it then wirelessly sends back to the RT-Range Hunter. As well as receiving the measurements from the GVT, the RT-Range Hunter in the VUT also receives measurements from the RT installed alongside it. Using this information, it can then make real-time calculations based on the position, orientation and velocity of two moving vehicles—including range and time to collision (TTC).

Back in the office, the data from both vehicles can be downloaded, processed, tested and exported in CSV format for further analysis, using software tools that are included free of charge.

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