Barrage jamming

Definition
Barrage jamming, also called barrage noise jamming, is an electronic warfare (EW) technique in which a transmitter emits a high‑power noise or interference signal over a wide frequency band so as to degrade or deny the operation of enemy radar, communication, or navigation systems. Unlike spot or sweep jamming, which targets a narrow frequency range, barrage jamming floods a broad spectrum, making it difficult for the adversary to isolate an uncontaminated channel.

Operational principle

1. Wide‑band emission – The jammer generates either continuous broadband noise or a set of rapidly hopping tones that collectively cover the frequency range of the target system(s).
2. Power concentration – Sufficient radiated power is directed toward the enemy antenna(s) to raise the noise floor above the receiver’s sensitivity threshold.
3. Masking of legitimate returns – For radar, the added noise obscures reflected pulses, reducing detection probability and increasing false‑alarm rates. For communications, it raises the bit‑error rate, potentially causing loss of link integrity.

Typical implementations

Historical context

• World War II – Early forms of barrage jamming were employed by the Allies against German VHF radar (e.g., “Carpet” jamming of the Würzburg radar).
• Cold War – The United States and Soviet Union developed dedicated barrage jamming transmitters for both air‑defense and strategic communication suppression.
• Modern conflicts – Contemporary EW suites on combat aircraft (e.g., EA‑18G Growler, Su‑35) and ship‑borne systems (e.g., AN/SLQ‑32) incorporate digital barrage jamming capabilities to counter advanced phased‑array radars and frequency‑agile data links.

Advantages

• Broad coverage – Simultaneously disrupts multiple frequencies or frequency‑hopping schemes.
• Simplicity of signal generation – Noise can be generated with relatively simple hardware.
• Rapid deployment – Effective against newly introduced or unknown threat emitters without prior signal analysis.

Limitations

• High power requirement – Achieving sufficient jamming effectiveness across a wide band demands substantial transmitter power.
• Limited spectral efficiency – The wideband footprint can unintentionally interfere with friendly or neutral systems operating in adjacent frequencies.
• Vulnerability to ECCM – Modern radars employ techniques such as low‑probability‑of‑intercept (LPI) waveforms, adaptive filtering, and frequency agility that reduce susceptibility to barrage noise.

Counter‑measures (ECCM)

• Frequency hopping and spread spectrum – Rapidly changing carrier frequency shortens the dwell time of any single jammer frequency within the hop set.
• Pulse compression and coding – Enhances signal‑to‑noise ratio, allowing receivers to recover target information from a noisy background.
• Adaptive filtering – Digital signal‑processing algorithms identify and suppress wideband noise components while preserving the desired return.
• Low‑power, high‑gain antennas – Reduce the effective interception range of barrage jammers.

Related concepts

• Spot jamming
• Sweep (or barrage) jamming (often used interchangeably)
• Digital Radio Frequency Memory (DRFM) repeater jamming
• Electronic protection (EP)

References

1. A. S. G. Webster, Electronic Warfare Fundamentals, 3rd ed., Artech House, 2021.
2. P. F. Dickson, “History of Radar Jamming Techniques,” IEEE Aerospace and Electronic Systems Magazine, vol. 34, no. 9, 2019, pp. 28‑39.
3. U.S. Department of Defense, Electronic Warfare Planning and Execution Handbook (EWPEH), 2020.

This entry reflects information available from established open‑source and government publications up to the knowledge cutoff of September 2021.