Apparatus for avoiding crosstalk problems when locating a vehicl

Details Apparatus for avoiding crosstalk problems when locating a vehicl Apparatus for avoiding crosstalk problems when locating a vehicl

1996-06-24

1998-06-02

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Determining distance

Combined with determining direction

342 22, 342159, G01S 1342

Patent

active

057607338

ABSTRACT:
An apparatus for avoiding crosstalk problems when locating a vehicle travelling along an electromagnetic wave propagation path. The apparatus is particularly directed to rail transport. The apparatus includes a transmitter for transmitting electromagnetic waves suitable for propagation along the propagation path. A reflector is included for reflecting the electromagnetic waves which propagate along the propagation path. The apparatus also includes a receiver, a comparator, and a processor. The apparatus is configured so that the transmitter does not transmit electromagnetic waves along the propagation path at the same time that the receiver receives the reflected electromagnetic waves. Because the transmitted waves are not transmitted on the propagation path at the same time as the reflected waves are received, the receiver receives only reflected waves at a time when there is no crosstalk interference between the transmitted and reflected waves. The vehicle's location is determined by comparing the transmitted and reflected waves.

REFERENCES:
patent: 3587100 (1971-06-01), Doremus et al.
patent: 3628147 (1971-12-01), Makino
patent: 3829682 (1974-08-01), Geiger
patent: 3854683 (1974-12-01), Bieder et al.
patent: 4022408 (1977-05-01), Staples
patent: 4467430 (1984-08-01), Even et al.
patent: 4488238 (1984-12-01), Salmon et al.
patent: 4660215 (1987-04-01), Horiike et al.

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