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Short Range Radar (SRR)


Automotive Short-Range Radar (SRR) are radar systems operating around a car when in motion to detect possible impacts with obstacles, such as other cars, walls, pedestrians, etc. so that safety measures may be triggered automatically, such as pre-tensioning of seat belts and inflating airbags. Ultimately, this could include automated braking to avoid or to mitigate collisions.

The SRR systems consists of a number of radars that can be used for a number of different functions, including:

  • Parking assistance: Rear-mounted sensors, with a range of 1.8-meters, can detect small objects in front of large objects and measure direction of arrival
  • Pre-crash sensing: The sensors scan out up to 30 meters to provide an advanced warning of an imminent collision to arm airbag, pre-tension seat restraints or other injury mitigation strategies
  • Blind spot detection: Short-range sensors detect objects in critical zones
  • Obstacle detection: With up to a 30 meter operating range, the radar sensor can be used to warn of unseen objects

Short Range Radar
Short Range Radar

Automotive short-range radars are permitted to use two harmonised frequency bands in the European Union: 24 GHz and 79 GHz. Since technology for the latter is not considered mature for commercial implementation as yet, the 24 GHz band may be used until 30th June 2013 with some detailed regulatory measures to avoid interference with existing users in the 24 GHz range, such as radio astronomy stations.

The 24 GHz band is actually a band of 5 MHz around 24,15 GHz (24,15 +/ 2,50 GHz; 21,65 to 26,65 GHz). The maximum mean power density is 41,3 dBm/MHz (eirp) and the maximum peak power density is 0 dBm/50MHz eirp, except for frequencies below 22 GHz, where the maximum mean power density shall be limited to -61,3 dBm/MHz eirp.

The 79 GHz band is 4 GHz width (77 - 81 GHz). The maximum mean power density is -3 dBm/MHz (eirp).

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