Abstract
In this paper, we examine several field tests of correlated helicopter noise and demonstrate that measured vertical gradients can offer signal-to-noise improvements of 4:1 in rotor noise and 6:1 in maneuver noise over comparable total field measurements for unexploded ordnance (UXO) applications. This translates into an additional [Formula: see text] in acceptable survey height or ordnance depth. Horizontal gradients, both transverse and longitudinal to the helicopter flight path, are also examined. These offer smaller signal-to-noise improvements over the total field (approximately 1.5:1) and have other disadvantages not found in the vertical gradient.
Published Version
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