A more detailed description defines it as the electronic warfare operations taken by a radar to offset the enemy's countermeasure.
This originated with the Royal Air Force's use of what they codenamed Window during World War II, which Americans referred to as chaff.
[4] In perhaps the first example of ECCM, the Germans increased their radio transmitter power in an attempt to 'burn through' or override the British jamming, which by necessity of the jammer being airborne or further away produced weaker signals.
The technology powering modern sensors and seekers allow all successful systems partly due to ECCM designed into them.
[5] Examples of electronic counter-countermeasures include the American Big Crow program, which served as a Bear bomber and a standoff jammer.
[6] It was a modified Air Force NKC-135A and was built to provide capability and flexibility of conducting varied and precision electronic warfare experiments.
This system, together with advanced microelectronics, also provided secure voice, data, and text communications under the most severe electronic warfare conditions.
One of the effects of the pulse compression technique is boosting the apparent signal strength as perceived by the radar receiver.
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 makes the use of such ECM a difficult decision – it may serve to obscure an exact location from non-ARMs, but in doing so it must put the jamming vehicle at risk of being targeted and hit by ARMs.
This mode, called "home-on-jam", actually makes the missile's job easier, as the jammer usually puts out more power than normal radar return would.