electronic warfare support measures
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electronic warfare support measures[i‚lek′trän·ik ′wȯr‚fer sə′pȯrt ‚mezh·ərz]
That division of electronic warfare involving actions taken to search for, intercept, locate, record, and analyze radiated electromagnetic energy for the purpose of exploiting such radiations in support of military operations. Also known as electronic support measures.
electronic warfare support measures (ESM)
That division of electronic warfare involving actions taken under direct control of an operational commander to search for, intercept, identify, and locate sources of radiated electromagnetic energy for the purpose of immediate threat recognition. Thus, ESM provide a source of information required for immediate decisions involving electronic countermeasures (ECM), electronic counter-countermeasures (ECCM), avoidance, targeting, and other tactical employment of forces.