Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Patent
1986-05-01
1989-02-14
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
By combining or comparing signals
364822, 364824, 367100, G06G 900
Patent
active
048051586
ABSTRACT:
An optical correlator using a light emitting diode array, in which analog gnals from two spaced sensors are correlated in order to locate and track a target. One signal is clipped and digitized and clocked through a shift register, and the other signal is delayed. The shift register is coupled to an LED array, element for element. Each shift register element modulates its corresponding LED element. The delayed signal is also connected at its output to the LED array via a transistor, and modulates each LED element. Therefore, the LED elements emit light in proportion to the product of the two signals. The emitted light is focused onto a CCD imaging array where it is integrated over a period of time before being sent to an integrator and output display device. The output is the correlation function versus the time delay between the two signals. Successive outputs display the movement of targets. Circuit design mitigates inherent errors within the system.
REFERENCES:
patent: 3392392 (1968-07-01), Magnuski
patent: 3486016 (1969-12-01), Faiss
patent: 3622963 (1971-11-01), Sage
patent: 3919707 (1975-11-01), Evans
patent: 4267580 (1981-05-01), Bond et al.
patent: 4468093 (1984-08-01), Brown
patent: 4519046 (1985-05-01), Cole
patent: 4651297 (1987-03-01), Schlunt
patent: 4669054 (1987-05-01), Schlunt et al.
Beers Robert F.
Hansen Henry
Swann Tod R.
Tarcza Thomas H.
The United States of America as represented by the Secretary of
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