Patent ID: 8611849

Claim:
A method of determining whether a signal received by a wireless communications device in a vehicle, on a wireless communication system control channel is authentic, the method comprising: monitoring a control channel signal; measuring the control channel signal level; identifying an abnormal rate at which the control channel signal level increases over time; upon the identification of an abnormal rate of increase in the control channel signal level, obtaining a current location from a navigation system; ignoring the abnormal rate of increase in the control channel signal level, at the current location, if the current location is proximate to a location listed in a data base; and when the abnormal rate of control channel signal level increases over time exceeds a threshold rate and when the current location is not proximate to a location listed in the data base, generating an output signal indicating that the identification of an abnormal rate of increase in the control channel signal level is likely due to a control channel jamming transmitter being proximate to the vehicle.