MULTIPLE BEAM SCANNED PLANAR ARRAY

摘要

Apparatus for determining the direction of arrival of an incoming wave front comprises a planar array of transducer elements arranged in N rows and N columns. The transducers are scanned serially in each row, and row by row, by a sequential sampler the output voltage of which comprises the sampled transducer voltages. A frequency spectrum analyzer such as a swept analyzer or bank of filters determines the frequency components of the sampler output which are related in a particular way to the angle of arrival of the incoming wave front.