Parking Sensors

Does anyone know what the technology of the sensors used in the Parking Sensor system? I have looked at the performance of the system on a 740 and it appears
to be very solid and void of false alarms. I don't know if it uses ultrasonic sensors, microwave, infrared, ... but I would like to find out more about their system. I question it being ultrasonic since they supposedly produce many false signals and are very sensitive to their environment. Does anybody know where I can find more detail on what technology they use? I would like to utilize the same technology in another application.
Thanks,
Binder2000
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Binder2000 wrote:

Ultrasonic - but with a very focused pattern.
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