Security Enhancements

To avoid security threats, measure the real physical distance between the vehicle and the smart key. If the vehicle detects that the smart key is not physically close, the vehicle simply ignores the command received.

The technique consists of measuring the time of flight of the Radio Frequency (RF) signal to estimate the distance between the transmitter and the receiver.

The time of flight, with the inclusion of ultra wide band technology, provides accurate data transfer and message timing which efficiently combats security threats. The time of flight operates over a frequency range of 3.99 GHz (4.5 GHz in China) and a bandwidth of 500 MHz.

The ultra wide band signal consists of narrow pulses, making it tolerant of multi-path and in-band interference. The deployment of this technology makes illegal entry and starting attempts much more difficult to achieve.

Ultra wide band technology used in Jaguar Land Rover (JLR) vehicles is very low power and therefore short range. The vehicle system is configured to only take action when the measured distance is no more than 3 meters.

Ultra wide band is capable of achieving a 10 cm accuracy. This allows very accurate zones, triggering the lock release mechanism only when the vehicle user is within close proximity to the vehicle.