Editing Electronic counter-countermeasure (section)

===Frequency hopping===
[[Frequency]] agility ("[[frequency hopping]]") may be used to rapidly switch the frequency of the transmitted energy, and receiving only that frequency during the receiving time window. This foils jammers which cannot detect this switch in frequency quickly enough or predict the next hop frequency, and switch their own jamming frequency accordingly during the receiving time window. The most advanced jamming techniques have a very wide and fast frequency range, and might possibly jam out an antijammer.<ref>{{Cite web |url=https://www.rbth.com/economics/2014/05/15/russia_surges_ahead_in_radio-electronic_warfare_35247 |title=Russia surges ahead in radio-electronic warfare &#124; Russia & India Report |date=15 May 2014 |access-date=2015-12-22 |archive-date=2020-09-22 |archive-url=https://web.archive.org/web/20200922221604/https://www.rbth.com/economics/2014/05/15/russia_surges_ahead_in_radio-electronic_warfare_35247 |url-status=live }}</ref>

This method is also useful against [[barrage jamming]] in that it forces the jammer to spread its jamming power across multiple frequencies in the jammed system's frequency range, reducing its power in the actual frequency used by the equipment at any one time. The use of [[spread-spectrum]] techniques allow signals to be spread over a wide enough spectrum to make jamming of such a wideband signal difficult.