What Is Electronic Warfare?

Electronic warfare (EW) is the use of the electromagnetic spectrum to sense, protect, and deny the operational environment to adversaries. It encompasses deliberate manipulation of the electromagnetic environment to gain military or strategic advantage, including actions that disrupt enemy sensors and communications, protect friendly systems from similar disruption, and gather intelligence from radiated signals. Electronic warfare is a domain of military operations that predates digital computing, with roots in radio jamming and direction-finding during the First and Second World Wars, but has grown steadily more sophisticated as radar, satellite communication, and software-defined radio have become central to modern military and civil infrastructure. U.S. Department of Defense doctrine divides the discipline into three main subdivisions: electronic attack, electronic protection, and electronic support.

Electronic Attack

Electronic attack (EA) comprises actions that use electromagnetic energy to degrade, neutralize, or destroy enemy equipment, information, or personnel. Jamming, in which a transmitter floods a target frequency band with interference to prevent enemy receivers from decoding legitimate signals, is the most familiar form. Noise jamming raises the noise floor across a band, while spot jamming concentrates energy on a specific channel. Deception jamming transmits false signals designed to mislead enemy radar and navigation systems. High-power microwave weapons and directed-energy devices also fall under electronic attack when they use electromagnetic energy to damage or disable electronics. The IEEE Xplore paper on information jamming in electronic warfare examines operational requirements and the signal processing techniques underlying modern EA systems.

Electronic Protection

Electronic protection (EP) refers to actions taken to protect friendly personnel, facilities, and equipment from the effects of electronic attack and from interference, whether hostile or environmental. Protection measures span a wide range of techniques: spread spectrum waveforms, including frequency hopping and direct sequence, reduce vulnerability to narrowband jamming by distributing signal energy across a broad frequency range. Emissions control (EMCON) disciplines reduce the probability that friendly transmitters are detected and located. Low probability of intercept (LPI) radar waveforms use randomized pulse patterns and wide bandwidths to evade electronic support receivers. Communication system security, encompassing encryption, authentication, and anti-jam coding, is a component of electronic protection that intersects with the broader domain of cryptographic information assurance. The IEEE Spectrum analysis of electronic warfare developments provides context on how adversarial EW capabilities have driven EP design requirements in recent operational experience.

Electronic Support and Intelligence

Electronic support (ES), also called electronic warfare support, consists of actions to search for, intercept, identify, and locate radiated electromagnetic energy for the purpose of immediate threat recognition and targeting. Electronic support receivers scan designated frequency bands, detect and classify emitters by their signal characteristics, and correlate detections with a library of known radar and communication signatures. This signals intelligence function provides situational awareness to commanders and feeds the targeting data that electronic attack elements use. Electronic intelligence (ELINT) and communications intelligence (COMINT), while formally associated with the broader intelligence community rather than tactical EW, share sensors, processing chains, and analytical methods with electronic support operations. The ScienceDirect overview of electronic warfare systems describes the system architectures used to integrate ES receivers with EA transmitters and EP decision logic in a single platform.

Applications

Electronic warfare capabilities are developed and deployed across a range of military and security contexts, including:

• Airborne jamming platforms that suppress enemy air defense radar and communication links
• Ship-based EW suites for protection against anti-ship missile seekers
• Ground vehicle electronic protection systems for countering improvised explosive device triggers
• Electronic intelligence collection for order-of-battle analysis and target characterization
• Spectrum management and frequency deconfliction in joint and coalition operations