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Noun1.ESM - electronic warfare undertaken under direct control of an operational commander to locate sources of radiated electromagnetic energy for the purpose of immediate threat recognition
electronic warfare, EW - military action involving the use of electromagnetic energy to determine or exploit or reduce or prevent hostile use of the electromagnetic spectrum
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References in periodicals archive ?
Passive countermeasures include early warning systems and signal jamming.
At the very least, there should be a comprehensive review of operational responses (e.g., CONOPs), I&W, force posture and presence, and active and passive countermeasures in the Asia-Pacific; a flow of forces into the region to counter this capability is problematic and could likely lead to PLA preemption.

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