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LSS Lane Departure Warning (LDW)

Technical Articles July 11, 2018

The Euro NCAP LSS LDW protocol is designed to evaluate the effectiveness of LDW systems, which alert the driver when the vehicle unintentionally leaves a lane but do not physically intervene. The protocol does this by driving the vehicle under test (VUT) along pre-surveyed lanes at 72 km/h and measuring when warning interventions from the LDW system are triggered as the vehicle crosses dashed or solid lines with different lateral velocities.

Protocol accuracy requirements 

  • Axes to be in ISO 8855:1991 orientation
  • Longitudinal speed to 0.1 km/h
  • Update rate at least 100 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 departure warning with OxTS RT-Range

Getting the measurements you need 

For the LSS LDW 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 alert 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 also used. 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 such as the in-vehicle robots from AB Dynamics.Using the CAN acquisition feature, any alert triggered by the LDW system can be captured and logged alongside the other data.

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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