Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1979-04-12
1981-01-13
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343113DE, 343123, 367102, G01S 314, G01S 1306, G01S 1506
Patent
active
042452201
ABSTRACT:
A target location system comprising a signal transmitter arrangement for transmitting pulses the frequency of which increase progressively during each pulse period from a frequency f to a frequency f+.DELTA.f and an echo signal receiver arrangement comprising a pair of echo signal receiver transducers arranged in spaced apart relationship, a first mixer having two input signal terminals fed from the said transducers one transducer being fed from each terminal, a second mixer via which one transducer of the pair is arranged to feed the first mixer, the second mixer being fed with a local oscillator signal, a first filter via which one sideband output signal from the said second mixer is fed to the said first mixer and a plurality of bandpass filters forming a filter bank fed from the first mixer, the filters of the bank each having a different passband or slot whereby all slots in aggregate cover a predetermined frequency band so that the bearing of a target from which an echo signal is received is indicated in accordance with the slot or slots in which the echo signal is received.
REFERENCES:
patent: 2519521 (1950-08-01), Weighton
patent: 3012222 (1961-12-01), Hagemann
patent: 3025517 (1962-03-01), Watson et al.
patent: 3068474 (1962-12-01), Higgins et al.
patent: 3119998 (1964-01-01), Foley
patent: 3386097 (1968-05-01), Richter et al.
patent: 3614786 (1971-10-01), Goggins, Jr.
Hubler Malcolm F.
Plessey Handel und Investments AG
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