Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1979-08-13
1981-09-29
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
343 5BL, 367910, G01S 1534, G01S 1588
Patent
active
042926785
ABSTRACT:
A method of locating an object by wave energy reflection and an apparatus therefor in which receiving outer transducers provide directional receptivities represented by polar lobes diverging on opposite sides of a reference axis and an inner receiving transducer provide a directional receptivity represented by a narrower polar lobe centered on the reference axis. The signals received from the outer transducers are operated upon in channels of the receiver to modulate them with a frequency swept local signal derived from the transmitted signal and develop indicator signals of difference frequency between the transmitted and received frequencies and which represent the range of the object. The outer signals are displayed binaurally, to enable the user to achieve firstly approximate directional sensing by binaural effect, and thereafter more accurate directional sensing by the use of signals developed in a central channel and derived from the inner transducer or outer transducers simulating an inner transducer. Gain in channels fed from the outer transducers is preferably adjusted as an inverse function of signal strength in the channel. Higher frequency components are preferably accentuated in the inner channel to improve object character recognition.
REFERENCES:
patent: 2702379 (1955-02-01), Barton
patent: 2982941 (1961-05-01), Chun
patent: 3107351 (1963-10-01), Milam
patent: 3172075 (1965-03-01), Kay
patent: 3329956 (1967-07-01), Caspers
patent: 3366922 (1968-01-01), Kay
patent: 3789353 (1974-01-01), Hunter et al.
Kay, The Radio and Electronic Engineer, vol. 44, Nov. 1974, pp. 605-627.
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