Electro-Warfare Aviation
Electronic Countermeasure Planes
- the inability of the antenna to use suboptimal frequencies
- the processing power needed
- the impossibility to practically intermix or segment antenna usages
Offensive ECM often takes the form of jamming. Defensive ECM includes using blip enhancement and jamming of missile terminal homers.
ECM is practiced by nearly all military units—land, sea or air. Aircraft, however, are the primary weapons in the ECM battle because they can "see" a larger patch of earth than a sea or land-based unit. When employed effectively, ECM can keep aircraft from being tracked by search radars, surface-to-air missiles or air-to-air missiles.
Electronic Support (ES)
Electronic support (ES) is the passive use of the electromagnetic spectrum to gain intelligence about other parties on the battlefield in order to find, identify, locate and intercept potential threats or targets. This intelligence, known as ELINT, might be used directly by fire-control systems for artillery or air strike orders, for mobilization of friendly forces to a specific location or objective on the battlefield, or as the basis of electronic attack or electronic protection actions.
Because ES is conducted passively, it can be performed without the target observing any electronic activities. ES's strategic counterpart, SIGINT, is continuously performed by most of the world's countries in order to gain intelligence derived from other parties' electronic equipment and tactics.
An older term for ES is electronic support measures (ESM).
Electronic defense
Electronic defense or Electronic protection (EP) is any measure that is aimed at defending friendly personnel/equipment. EP can also be implemented to prevent friendly forces from being affected by their own EA.
- Active EP includes such activities as technical modifications to radio equipment (such as frequency-hopping spread spectrum).
- Passive EP includes such activities as the education of operators (enforcing strict discipline) and modified battlefield tactics or operations.
Older terms for EP include electronic protective measures (EPM) and electronic counter countermeasures (ECCM).

