How does electronic warfare use the electromagnetic spectrum against an enemy?

Electronic warfare involves the strategic use of the electromagnetic spectrum to gain a military advantage by denying an enemy the ability to use their own electronic systems while protecting one's own.1

Key methods used against an enemy include:

• Electronic Countermeasures (ECM): These tactics aim to degrade or neutralize enemy systems. Jamming overrides radio transmissions or confuses radar by increasing noise levels or generating false targets. Other methods include deploying chaff—metallic strips that create false echoes—and using decoys to mask real targets.12
• Signals Intelligence (SIGINT): This involves eavesdropping on enemy communications to gather critical intelligence.1
• Electronic Support Measures (ESM): These are used to detect and identify enemy emissions, providing data for threat recognition, targeting, and the development of further countermeasures.1

To maintain operational integrity, forces employ electronic counter-countermeasures (ECCM), such as frequency-hopping, to ensure their own communications remain secure against enemy interference.1