Detection of signals

摘要

Described herein is a method and apparatus for the detection of signals in an area of interest. Three sensor channels are provided for sensing radiated emissions in an area of interest, each channel having a sensor and a processor, the three channels sensing radiated emissions in the very low frequency band, the high/very high frequency band, and the ultra high frequency band respectively. The first and third sensor channels provide input signals to the processor in the second sensor channel so that accumulated signal data can be processed to produce an input signal for a comparator. The comparator compares the input signal with data stored in a database to indicate presence of equipment having known modes of operation.

主权项

1. A method of determining an operation of equipment in an area based on radiated emissions of the equipment, the method comprising:
a) receiving radiated emissions in at least one frequency band; b) generating at least one spectral output signal indicative of the received radiated emissions, the at least one spectral signal having peaks; c) processing each spectral output signal to determine modulation on the peaks over time in the spectral output signal; d) comparing the modulation on the peaks with data stored in a database; and e) determining a presence of operating equipment in the area from the comparing.