Dual-frequency receiving array using randomized element position

Details Dual-frequency receiving array using randomized element position Dual-frequency receiving array using randomized element position

1991-11-13

1992-12-01

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

With beam steering, scanning, or focussing

367103, 367135, 367905, G01S 380

Patent

active

051684721

ABSTRACT:
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..sub.o of its corresponding nominal position where .epsilon. is a randomization parameter and .lambda..sub.o is the wavelength of the higher frequency wave.

REFERENCES:
patent: 4064479 (1977-12-01), Ruehle
patent: 4143351 (1979-03-01), Orieux
patent: 4460987 (1984-07-01), Stokes et al.
patent: 4509151 (1985-04-01), Anderson
patent: 4567766 (1986-02-01), Seiferling
patent: 4882714 (1989-11-01), Tanigawa
Lockwood, "Randomized Arrays", J. Acoust Soc. Am 81(4), Apr. 1987, pp. 101013.

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