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LSS Lane Keeping Assist (LKA)

Technical Articles July 11, 2018

The Euro NCAP LSS LKA protocol is designed to evaluate the effectiveness of LKA systems that physically intervene to keep the vehicle within its lane when an unintentional departure is detected. This is done by driving the vehicle under test (VUT) along surveyed lanes at 72 km/h and causing it to drift out of the lane at different lateral velocities. Of particular interest is at which point any warnings are triggered and the correcting lateral acceleration of the vehicle moving back into the lane.

The test is conducted as the vehicle moves between lanes across solid and dashed lines, and as it leaves the paved area.

Protocol accuracy requirements 

  • Axes to be in ISO 8855:1991 orientation
  • Longitudinal speed to 0.1 km/h
  • Update rate at least100 Hz
  • Time is required as a synchronisation DGPS
  • Position to 0.03 m
  • Yaw velocity to 0.1°/s
  • Acceleration to 0.1 m/s²
  • Vehicle edge to lane edge measurements

Lane keep assist testing with OxTS RT-Range

Getting the measurements you need 

For the LSS LKA tests, the key measurements are the distance from the outer-edge bulge of the front tyres to the inside edge of the lane markings and when any intervention is triggered. To capture these measurements, the vehicle is installed with an RT to accurately measure its position, velocity and orientation. A local base station is normally used too. It sends out differential GNSS corrections allowing the RT to achieve RTK integer 1 cm accuracy.

An RT-Range Hunter is also installed in the VUT. The Hunter takes information from the RT via Ethernet and calculates the distance from the defined vehicle edges to the edges of the lane markings. Lane marking information can be pre-surveyed using the RT and our survey trolley. The survey information is then uploaded into the RT-Range Hunter for use in real-time calculations.

If a steering robot is being used to control the position and deviation of the VUT within the lane, information from the RT can easily be fed into it. The RT is compatible with all top-end steering robots and pedal robots. Information from the RT-Range S can be output in real-time if a separate device is being used to log steering wheel force, or that information can also be logged by the RT-Range S via CAN bus, along with any alerts generated by the LKA system.

Once back in the office, data can be downloaded, post-processed, tested and exported in CSV format ready for further analysis.

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