|The various technologies presented herein relate to generation of a
desired waveform profile in the form of a spectrum of apparently random
noise (e.g., white noise or colored noise), but with precise spectral
characteristics. Hence, a waveform profile that could be readily
determined (e.g., by a spoofing system) is effectively obscured.
Obscuration is achieved by dividing the waveform into a series of chips,
each with an assigned frequency, wherein the sequence of chips are
subsequently randomized. Randomization can be a function of the
application of a key to the chip sequence. During processing of the echo
pulse, a copy of the randomized transmitted pulse is recovered or
regenerated against which the received echo is correlated. Hence, with
the echo energy range-compressed in this manner, it is possible to
generate a radar image with precise impulse response.