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US 4,253,166 AGranted
Target location systems
AssigneePlessey Handel und Investments AG
InventorPhillip L. M. Johnson
Life of this patent
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AssigneePlessey Handel und Investments AG
InventorPhillip L. M. Johnson
Estimating the term…
A target location system comprising a signal transmitter including a pair of signal transmitter transducers arranged in spaced apart relationship and means for driving the transducers with transmitter pulse signals at the frequencies Fo and Fo+Fb respectively which are arranged to increase progressively in frequency during each pulse to Fo+.DELTA.f and Fo+Fb+.DELTA.f respectively where .DELTA.f is equal to or less than Fb, and an echo signal receiver comprising receiving transducer means feeding a filter bank, the filter bank comprising a plurality of filters which cover in aggregate a predetermined frequency band, each filter being adapted to cover one slot or section of the band whereby the bearing of a target from which an echo signal of a transmitter pulse signal is received, is indicated in accordance with the slot or slots in which the echo signal is received.
A target location system comprising a signal transmitter including a pair of signal transmitter transducers arranged in spaced apart relationship, means for driving the transducers with transmitter pulse signals at the frequencies Fo and Fo+Fb respectively which are arranged to increase progressively in frequency during each pulse to Fo+.DELTA.f and Fo+Fb+.DELTA.f respectively, where .DELTA.f is equal to or less than Fb, and an echo signal receiver comprising receiving transducer means feeding a filter bank the filter bank comprising a plurality of filters which cover in aggregate a predetermined frequency band, each filter being adapted to cover one slot, or section of the band whereby the bearing of a target from which an echo signal of the transmitter pulse signal is received is indicated in accordance with the slot or slots in which the echo signal is received.
A target location system comprising a signal transmitter including a pair of signal transmitter transducers arranged in spaced apart relationship, means for driving the transducers with transmitter pulse signals at the frequencies Fo and Fo+Fb, respectively, which are arranged to increase progressively in frequency during each pulse to Fo+.DELTA.f and Fo+Fb+.DELTA.f, respectively, where .DELTA.f is equal to or less than Fb, and an echo signal receiver comprising receiving transducer means feeding frequency detector means operative to provide an indication of a target bearing in dependence upon the difference frequency between transmitted pulses reflected contemporaneously from the target to the receiving transducer means.
Dependencies are inferred from the claim text.