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Passive emitter tracking (PET) algorithms can estimate both the range andDoppler of a wireless emitter when it uses orthogonal frequency divisionmultiplexing (OFDM). In this paper we are interested to prevent this fromhappening by an unauthorized receiver (URx). To accomplish that we introduce inthe transmitted signal a \textit{spoofing signal} that varies acrosssubcarriers and successive OFDM symbols. With this technique the emitter is notonly able to spoof its actual range and Doppler (allowing covert communicationin terms of these two parameters), but is also capable of producing additionalfalse emitter signatures to further confuse the URx. To evaluate theperformance of our approach we calculate the range-Doppler response at the URxfor different system configurations of an 802.11-based system.

Range-Doppler Spoofing in OFDM Signals for Preventing Wireless Passive Emitter Tracking