System and method for detection of cellular signal jamming for security systems

A cellular jamming detection device, comprising:

• RF receiving circuitry configured to receive RF energy across a plurality of cellular frequency bands;
• a plurality of RF signal conditioning circuits, each RF signal conditioning circuit corresponding to a different cellular frequency band and configured to produce a band-specific RF energy signal;
• a processor coupled to the plurality of RF signal conditioning circuits and configured to:
• establish baseline RF energy levels for the plurality of cellular frequency bands;
• compare band-specific RF energy signals to the corresponding baseline RF energy levels;
• determine whether elevated RF energy persists in each cellular frequency band for longer than a predetermined duration;
• and
• declare a cellular jamming condition based on concurrent persistent elevated RF energy in more than one cellular frequency band;
• and
• an output interface operable to provide a signal indicative of the declared cellular jamming condition.

A method for detecting cellular signal jamming, comprising:

• receiving radio frequency (RF) energy from an environment;
• obtaining RF energy measurements for each of a plurality of RF measurement channels corresponding to different cellular frequency bands;
• establishing reference RF energy levels for the plurality of RF measurement channels;
• comparing the RF energy measurements to the corresponding reference RF energy levels;
• identifying elevated RF energy within individual RF measurement channels based on the comparing;
• determining whether the elevated RF energy persists over multiple measurement intervals for each RF measurement channel;
• evaluating RF energy conditions across the plurality of RF measurement channels collectively;
• and
• declaring a cellular jamming event when elevated RF energy is detected in a predetermined number of the RF measurement channels.