Editing Electronic counter-countermeasure (section)

===Pulse compression by "chirping", or linear frequency modulation===
One of the effects of the [[pulse compression]] technique is boosting the apparent signal strength as perceived by the radar receiver.  The outgoing radar pulses are [[chirp]]ed, that is, the frequency of the carrier is varied within the pulse, much like the sound of a cricket chirping.  When the pulse reflects off a target and returns to the receiver, the signal is processed to add a delay as a function of the frequency.  This has the effect of "stacking" the pulse so it seems stronger, but shorter in duration, to further processors.  The effect can increase the received signal strength to above that of noise jamming.  Similarly, jamming pulses (used in deception jamming) will not typically have the same chirp, so will not benefit from the increase in signal strength.