Dual-Frequency Receiving Array Using Randomized Element Positions.
Patent, Filed 13 Nov 91, patented 1 Dec 92,
DEPARTMENT OF THE NAVY WASHINGTON DC
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An array for receiving wave energy at a pair of widely spaced frequencies has receiving elements arranged to function as a half-wave array for the lower frequency and as a random array for the higher frequency. A plurality of receiving elements are arranged in an array with the receiving elements having nominal positions spaced apart such that spacing between adjacent nominal positions is approximately one half the wavelength lambda of the wave having the lower frequency. The receiving elements are randomly distributed about their respective nominal positions with each receiving element being within a distance of epsilon lambda omicron of its corresponding nominal position where epsilon is a randomization parameter and lambda omicron is the wavelength of the higher frequency wave.
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