DETECTION OF AN ELECTRICAL DEVICE BY AN UNINTENTIONALLY RADIATED RF SIGNAL

摘要

There is provided a method of detecting an electrical device by searching for an RF signal that is emitted from the electrical device. The RF signal is a continuous wave signal that has a known carrier frequency and a sideband at a known frequency offset from the carrier frequency, and may be an unintentionally radiated RF signal. The method comprises receiving (10) an RF signal; downconverting (40) the received RF signal to a baseband signal, the downconverting being done according to the known carrier frequency such that the baseband signal encompasses the continuous wave signal; squaring (60) the baseband signal; calculating (70) a frequency spectrum of the squared baseband signal; and checking (80) the frequency spectrum for a peak corresponding to the known frequency offset.