초록 ▼

Forming and directive control of the beam in a circular sonar array without time delay or phase shift networks. Predetermined weighting coefficients are used to scale sensor outputs that are summed in an add-only processor to provide a weighted sum output characteristic of target position relative t

Forming and directive control of the beam in a circular sonar array without time delay or phase shift networks. Predetermined weighting coefficients are used to scale sensor outputs that are summed in an add-only processor to provide a weighted sum output characteristic of target position relative to the main receiving axis of the array.

대표청구항 ▼

A method for controlling the directivity of a circular array of acoustic sensors so as to be characterized by a formed beam along a main receiving axis, said method comprising the steps of: providing a circular array of radius R including sensors 1 through N disposed on one side of a xeroth sensor o

A method for controlling the directivity of a circular array of acoustic sensors so as to be characterized by a formed beam along a main receiving axis, said method comprising the steps of: providing a circular array of radius R including sensors 1 through N disposed on one side of a xeroth sensor on said main receiving axis and -1 through -N disposed on the other side of said zeroth sensor, said sensors being equally spaced aximuthally from one another; imposing a set of weighting coefficients A(n) on the outputs of said sensors, said coefficients A(n) each comprising a product of a signal replica factor A1(n)=Cos [2pR(1-cos an)], a sensor density correction factor A2(n)=cos an, and an aperture illumination factor A3(n)=cos an, where an is the angle of the nth sensor from said main receiving axis, so as to provide weighted sensor outputs; and adding said weighted sensor outputs such that the weighted sum output [Figure] results in formation of a beam │E*(qn*(qq