Abstract
Public concern about the noise from low-altitude military jet overflights and its alleged effects on the health and annoyance of those overflown has resulted in some restrictions on flying activities at low level, even bans within some countries, being imposed. Much past research into aircraft noise emissions has been based on band-limited noise measurements. Full pressure signatures are required if all possible noise effects are to be fully understood. In 1995 a series of trials was completed in the UK under controlled conditions, and typical wideband noise signatures obtained for a variety of speeds and heights of a Tornado aircraft. Samples of these signatures are presented and the various pertinent characteristics highlighted. The question as to whether these signatures should be considered impulsive is discussed.
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