Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1990-09-26
1992-06-23
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367 98, H01S 1500
Patent
active
051249545
ABSTRACT:
This invention relates to a method of, and apparatus for, detecting the position of an object relative to a detector device, in which a pulse signal is transmitted to such object by a transmitter means, and a receiver means receives a signal reflected by the object, the position of the object being determined in dependence upon the time difference between the moment the transmitter means transmits the pulse signal and the moment the receiver means receives the reflected signal. According to the invention, to eliminate the effect of spurious signals, a reference signal stored in a memory means is subtracted from the signal received by the receiver means, which reference signal has previously been received by the receiver means in response to a signal transmitted by the transmitter means in the absence of an object whose position is to be detected.
REFERENCES:
patent: 3399404 (1968-08-01), Githens et al.
patent: 3422435 (1969-01-01), Cragon et al.
patent: 4382291 (1983-05-01), Nakauchi
patent: 4639902 (1987-01-01), Leverance et al.
patent: 4952911 (1990-08-01), D'Ambrosia
Pihulic Daniel T.
Staalkat B.V.
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