Method and apparatus to determine if a cellular jamming signal is malicious or non-malicious based on received signal strength

摘要

A signal on a wireless communication system control channel can be identified as authentic or malicious by monitoring control channel signal strength changes. When a control channel signal level increases abnormally fast or too quickly, i.e., above a threshold value rate of increase, the control channel signal is identified as likely being from a malicious source, such as a jamming transmitter.

主权项

1. A method of determining whether a signal received by a wireless communications transceiver 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; determining a rate of increase in the control channel signal level; determining if the control channel signal level rate of increase exceeds a predetermined threshold; after determining that the control channel signal level rate of increase exceeds the predetermined threshold, determining from a navigation system on the vehicle, a first location of the vehicle where the control channel signal level rate of increase exceeded said predetermined threshold; determining from a jamming transmitter location database stored within the vehicle whether said first location is proximate to a location where a control channel signal jamming transmitters is known to be located; and identifying the rate of increase in the control channel signal level as indicative of a control channel jamming signal when the rate of increase exceeds the predetermined threshold and when the first location of the vehicle is not proximate to a location where a control channel signal jamming transmitter is known to be located.