Abstract
In the presence of ground reflections, the traditional methods for aircraft noise direction of arrival
estimation based on the time differences between the microphones of a compact array lose accuracy
in the vertical direction. With the aim of reducing this error, this work explores the use of directional
instead of omnidirectional microphones in a tetrahedral array geometry. The theoretical advantages
of using directional microphones are analyzed, and in the particular case of first-order directivity, it
is shown, by computer simulation and by experimental measurements of jet and propeller aircraft
take-offs, that the improvement is relevant.
estimation based on the time differences between the microphones of a compact array lose accuracy
in the vertical direction. With the aim of reducing this error, this work explores the use of directional
instead of omnidirectional microphones in a tetrahedral array geometry. The theoretical advantages
of using directional microphones are analyzed, and in the particular case of first-order directivity, it
is shown, by computer simulation and by experimental measurements of jet and propeller aircraft
take-offs, that the improvement is relevant.