  Passive emitter tracking (PET) algorithms can estimate both the range and
Doppler of a wireless emitter when it uses orthogonal frequency division
multiplexing (OFDM). In this paper we are interested to prevent this from
happening by an unauthorized receiver (URx). To accomplish that we introduce in
the transmitted signal a \textit{spoofing signal} that varies across
subcarriers and successive OFDM symbols. With this technique the emitter is not
only able to spoof its actual range and Doppler (allowing covert communication
in terms of these two parameters), but is also capable of producing additional
false emitter signatures to further confuse the URx. To evaluate the
performance of our approach we calculate the range-Doppler response at the URx
for different system configurations of an 802.11-based system.
