Arrangement for a passive responder for a position finding system
First Claim
1. A passive responder for a position locating system for a wheeled railway vehicle moving on a track and in which said vehicle carries a microwave transmitter and receiver and transmits an interrogation signal to said passive responder the improvement wherein said responder includes a resonator member with several resonators which is mounted in the proximity of a rail of the track, a microwave antenna forming a part of said responder and pointed upwardly with its reciving and radiation opening in immediate proximity to the head of the rail, and a cover member of a dielectric material covering the upper end of said antenna and mounted so that it is engaged by the wheels of said vehicle as they roll by the responder on the rail.
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Abstract
This invention relates in general to a passive responder of a position finding system including at least one microwave antenna and a resonator body. The resonator body is mounted adjacent the rail of a railroad track and is connected to a microwave antenna which points upwardly such that it receives radiation from a transmitter carried by the train. The radiation opening of the receiving antenna is adjacent the rail head and the antenna is covered with a cover member comprising dielectric material which comes into contact with the wheel as each wheel rolls past. The contact of the wheel with the dielectric cover assures that ice, snow, and other foreign material will be continuously cleared from the receiving antenna so as to assure optimum operation of the transponder.
17 Citations
10 Claims
- 1. A passive responder for a position locating system for a wheeled railway vehicle moving on a track and in which said vehicle carries a microwave transmitter and receiver and transmits an interrogation signal to said passive responder the improvement wherein said responder includes a resonator member with several resonators which is mounted in the proximity of a rail of the track, a microwave antenna forming a part of said responder and pointed upwardly with its reciving and radiation opening in immediate proximity to the head of the rail, and a cover member of a dielectric material covering the upper end of said antenna and mounted so that it is engaged by the wheels of said vehicle as they roll by the responder on the rail.
Specification