Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1983-09-28
1987-02-24
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
364726, 342196, H01Q 322
Patent
active
046460993
ABSTRACT:
Signals from antenna elements (14) of a rectangular array (12) are translated in frequency by mixers (16) fed from a chirped local oscillator (19). The resultant signals are fed to the first of two groups (20 and 36) of two-dimensional delay lines connected in series at right angles to each other. The two-dimensional delay lines are dispersive, having a linear relationship of delay to frequency, and the sweep rate of the local oscillator (19) is such that the signals caused by a given frequency component at the mixer input ports are completely compressed in time when they reach the output ports (46) of the delay lines of the second group (36). As a consequence, the device performs a three-dimensional Fourier transformation from time and two spatial dimensions to temporal frequency and two dimensions of spatial frequency. When fed by a two-dimensional antenna array, the output of the device can readily be interpreted as indicating the direction of the source and the frequency at which it is radiating.
REFERENCES:
patent: 3255450 (1966-06-01), Butler
patent: 4084148 (1978-04-01), Koshikawa
patent: 4204262 (1980-05-01), Fitelson et al.
patent: 4332016 (1982-05-01), Berntsen
patent: 4542657 (1985-09-01), Barber et al.
Blum Theodore M.
Sanders Associates Inc.
Seligman Richard I.
Weinstein Stanton D.
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