Vehicle location system
First Claim
1. A radio location system comprising a fixed base radio station, a radio propagation guiding means following a linear route, mobile radio station means for travelling such linear route, static marker means included in the propagation guiding means and arranged to apply discrete and time-sequential modifications constituting individual interruptions to a radio signal being transmitted through the guiding means in such manner that the position of a mobile radio station may be determined by reference to the numer of such discrete time-sequential modifications thereby imparted to a radio signal transmitted between the fixed base station and the said mobile station.
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Accused Products
Abstract
A leaky-feeder or other form of guided radiocommunication system serving a linear route or track is equipped at intervals with static marker devices which successively modify a radio signal passing those points between a fixed base station and a personal or mobile station travelling the route. By reference to the resulting overall modification to the signal as received at the mobile or fixed station the position of the mobile station may be determined or delimited.
40 Citations
20 Claims
- 1. A radio location system comprising a fixed base radio station, a radio propagation guiding means following a linear route, mobile radio station means for travelling such linear route, static marker means included in the propagation guiding means and arranged to apply discrete and time-sequential modifications constituting individual interruptions to a radio signal being transmitted through the guiding means in such manner that the position of a mobile radio station may be determined by reference to the numer of such discrete time-sequential modifications thereby imparted to a radio signal transmitted between the fixed base station and the said mobile station.
- 8. A location system comprising fixed base station means, mobile station means for travelling with respect to the fixed base station means along a route, signal propagation means for propagating a signal, guiding means for guiding the signal along the route, marker means positioned along the route for applying discrete modifications to the signal being guided through the guiding means, whereby positions of the mobile station means may be determined by reference to the discrete modifications imparted to the signal between the fixed base station means and the mobile station means.
- 17. A method for relatively locating a mobile station with respect to a fixed base station comprising propagating a signal along a route travelled by the mobile station, providing marker means along the route and marking the signal with the marker means as the signal is propagated along the route, receiving the marked signal and determining the position of the mobile station means according to markings in the signal.
Specification