Electronically scanned echo pulse receiver

Details Electronically scanned echo pulse receiver Electronically scanned echo pulse receiver

1977-04-15

1978-09-26

Tubbesing, T.H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

H01Q 326

Patent

active

041174879

ABSTRACT:
Scanning angle control for a linear array of spaced transducers in a pulse echo receiver is implemented by mixing the respective transducer outputs with progressively shifted output signals from a multi-stage, variable phase shifter fed by a local oscillator. The additively combined mixer outputs thus contain frequency sum and difference components, which are extracted by low or high pass filters to implement scanning control on either side of a perpendicular to the array. When a two dimensional array of transducers arranged in a row and column coordinate grid is employed, scanning in both azimuth and elevation may be implemented by coupling each column of transducer mixers to the respective phase shifter stages through digital delay circuits arranged in rows and fed by a variable frequency clock pulse generator, whereby progressive delays are provided in the columnar direction.

REFERENCES:
patent: 3202992 (1965-08-01), Kent et al.
patent: 3238528 (1966-03-01), Hines
patent: 3460145 (1969-08-01), Johnson
patent: 3500303 (1970-03-01), Johnson
patent: 3600701 (1971-08-01), Gouldthorpe
patent: 4005382 (1977-01-01), Beaver

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