Electronic countermeasures is a division of EW involving actions taken to prevent or reduce an
enemy's efficient use of the electromagnetic spectrum. This lesson introduces you to the two
types of ECM--jamming and deception; how to recognize and identify them; and the correct
procedures to be followed when being jammed. This lesson is presented in frames. After you
complete a frame, check your response against the desired response and proceed to the next
frame. When you feel confident that you are proficient on the information presented, take the
practice exercise and check your answers against the answer key and feedback sheet before
proceeding to Lesson 2.
PART A: DEFINITIONS OF ELECTRONIC WARFARE TERMS
This program provides information regarding difficulties which communications may be
subjected to in time of war. First, it is worthwhile to define key EW terms.
ELECTRONIC WARFARE (EW) - Military action involving the use of
electromagnetic energy to determine, exploit, reduce, or prevent hostile use of the
electromagnetic spectrum, and action which retains friendly use of the electromagnetic spectrum.
EW is divided into three parts, electronic support measures, electronic
countermeasures, and electronic counter-countermeasures.
ELECTRONIC WARFARE SUPPORT MEASURES (ESM) - The part of EW
involving actions taken (under direct control of operational commander) to search for, intercept,
locate, and identify sources of radiated electromagnetic energy for the purpose of immediate
threat recognition. Thus, ESM provides ECM, ECCM, avoidance, targeting, and other tactical
employment of forces.
taken to prevent or reduce effective use of the electromagnetic spectrum by hostile forces.
ECM is divided into two parts: Jamming and Deception.