Abstract:
An echo sounding apparatus having a source of coherent waves and an array of detectors each providing an output signal significant of the phase and amplitude of that portion of a wave reflected from the target to which the coherent wave from the source is directed. Sampling circuitry samples the outputs of the detectors at periods delayed with respect to a sampling origin time by an amount proportional to the square of the distance from the sampled detector to a reference point in the array. A calculator is then provided for carrying out a Fourier transformation on each sample to provide an output signal representative of the target.
Abstract:
A device for determining the direction of propagation of a plane wave in an isotropic medium, in which the detectors are uniformly distributed on a circle. These detectors are disposed in groups each corresponding to a predetermined direction. Each detector is connected to a chain consisting of the same number of adders as detectors in a group. The adders are interconnected by shift registers.
Abstract:
A device for determining the direction of propagation of a plane wave in an isotropic medium, in which the detectors are uniformly distributed on a circle. These detectors are disposed in groups each corresponding to a predetermined direction. Each detector is connected to a chain consisting of the same number of adders as detectors in a group. The adders are interconnected by shift registers.