Abstract
This article describes the current situation in the area of electronic warfare. Aircraft protection can be greatly utilised not only in military but also in civilian applications. Active radar signal jamming methods are costly and therefore, aircraft protection using Chaff jamming increases efficiency, application variability and makes aircraft protection affordable. The article describes Chaff and the initial set of measurements designed for measuring aerodynamic pressure around a stationary helicopter model. This data lays foundations for the direction of further development, which is introduced at the end of the article.
Highlights
Chaff is defined as “strips of lightweight metal or metallic materials that are dispersed in large numbers that may be utilised in the surveillance or observation volume of radar to reflect impinging signals and simulate a true target.” Chaff typically consists of strips of aluminium foil or metal‐coated fibres
Use of Chaff is restricted or even forbidden in many countries due to its environmental risks caused by the applied materials
The article describes the initial set of measurements designed for measuring aerodynamic pressure around a stationary helicopter model, which will continue to the complex measurement of the turbulent air pressure matrix in the space around the rotary‐wing model
Summary
Chaff is defined as “strips of lightweight metal or metallic materials that are dispersed in large numbers (bundles) that may be utilised in the surveillance or observation volume of radar to reflect impinging signals and simulate a true target.” Chaff typically consists of strips of aluminium foil or metal‐coated fibres. 1) A localised Chaff puff or burst simulates the true target, and serves as a decoy to radar without Doppler clutter rejection capability. This contributes to the overload of data output [1, 3, 4]. Chaff dipoles are intended to resonate at the victim radars’ frequencies This requires the dipole length to be approximately one‐half of the radar wavelength [5]. The hot gases generated by an explosive impulse cartridge are applied These gases push a small plastic piston down a chaff‐filled tube, 8 inches in length, with a 1‐inch‐square cross‐section. Chaff is fed by motors from rolls of approximately 40 pounds, through cutters carried on aircraft to produce either bursts or a continuous stream. 750 seven‐ounce boxes of chaff, each box containing up to 11 million fibres to be expelled continuously or in bursts, can be carried by the B‐52 [6, 7]
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