Definition

1. Noun:
   • Electronic warfare undertaken under direct control of an operational commander to locate sources of radiated electromagnetic energy for the purpose of immediate threat recognition: This term refers to a specific subset of electronic warfare (EW) activities. Its primary function is to detect, identify, and locate enemy radar, communications, and other electronic emitters. This information is gathered in real-time or near-real-time to provide immediate situational awareness and warn of potential threats, such as missile guidance systems or enemy surveillance.

Usage Examples

• Noun:
  • The aircraft's primary mission was to conduct electronic warfare-support measures to map enemy air defense radars.
  • Effective electronic warfare-support measures are crucial for the fleet's ability to recognize and evade incoming threats.
  • The intelligence gathered through electronic warfare-support measures was fed directly to the strike team.

Advanced Usage

• Acronym: The term is commonly abbreviated as ESM (Electronic Support Measures).
  • The ESM suite on the reconnaissance pod identified multiple hostile signals.
• Role in the "ESM" cycle: It is often described as the first step in a cycle that includes Electronic Attack (EA) and Electronic Protection (EP). ESM provides the necessary information for effective jamming (EA) and for protecting one's own forces (EP).

Variants and Related Words

• Electronic Support (ES): A broader, more modern term that encompasses ESM and is one of the three core pillars of Electronic Warfare, alongside Electronic Attack and Electronic Protection.
• Signals Intelligence (SIGINT): A related but broader intelligence discipline. ESM is a tactical, real-time component often focused on immediate threat warning, while SIGINT includes more strategic, long-term analysis of intercepted signals.
• Radar Warning Receiver (RWR): A specific type of equipment carried on aircraft that performs an ESM function by detecting and identifying radar signals that are tracking or targeting the aircraft.

Synonyms

• Electronic Support Measures (ESM): The direct and most common synonym.
• Tactical SIGINT: Emphasizes the immediate, battlefield-focused application of signals intelligence.

Related Phrases

• Electronic Warfare (EW): The overarching domain of military action involving the use of the electromagnetic spectrum.
• Threat Emitter Library: A database of known electronic signals used by ESM systems to identify detected emissions.
• Direction Finding (DF): A key technical process within ESM used to locate the source of a signal.

Noun

1. electronic warfare undertaken under direct control of an operational commander to locate sources of radiated electromagnetic energy for the purpose of immediate threat recognition