Radar Interference
Radar jamming and deception is a form of electronic countermeasures that intentionally sends out radio frequency signals to interfere with the operation of radar by saturating its receiver with noise or false information. Concepts that blanket the radar with signals so its display cannot be read are usually known as jamming, while systems that produce confusing or contradictory signals are known as deception, but it is also common for all such systems to be referred to as jamming. There are two general classes of radar jamming, mechanical and electronic. Mechanical jamming reflects enemy radio signals in various ways to provide the radar operator with false or misleading target signals. Electronic jamming works by transmitting additional radio signals toward enemy receivers, making it difficult to detect real target signals or take advantage of known behaviors of automated systems like radar lock-on to confuse the system. Various counter-countermeasures can sometimes help radar operators maintain target detection despite jamming [Wikipedia].
Often radar detects things that they are not designed to detect. For example, a marine radar designed to detect ships may also pick up waves on the sea surface – or an air traffic control radar designed to detect aircraft may detect vehicles on a busy road near the airport. In all these cases, the radar system can detect and display things it was not originally designed to detect. These particular effects can be referred to as clutter, false returns, or simply radar interference. False returns tend to be used more with modern digital systems, whereas clutter tends to be used more with older analog systems [Pager Power.com].
Radar jamming and deception. Wikipedia. Retrieved from: https://en.wikipedia.org/wiki/Radar_jamming_and_deception
Radar Interference. Pager Power.com. Retrieved from: https://www.pagerpower.com/news/radar-interference/