System for determining the position of a transponder
First Claim
1. System for determining a position of a transponder, which transmits a signal and moves along a route with at least a measuring station comprising antenna means for receiving said signal at least at two measuring points positioned at the two outer points of a line segment which crosses the course in a perpendicular manner, wherein said measuring station comprises:
- a first receiver for receiving said signal through said antenna means at the one measuring point,a second receiver for receiving said signal through said antenna means at the other measuring point,high frequency phase measuring means measuring the phase difference between the output signal of the first receiver and the output signal of the second receiver,evaluation means which, based on the measured phase difference, determines where the transponder passes said line segment.
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Accused Products
Abstract
A system for determining the position of a transponder transmitting a signal and moving along a route is disclosed. The route includes a measuring station with at least two measuring points having on each side of the route and along a line generally perpendicular to the route. The measuring station includes a first receiver that receives the signal at one measuring point and a second receiver that receives the signal at the other measuring point. Each receiver provides an output. A circuit measures the phase difference between the outputs of the first and second receivers, and the transponder location along the line between the measuring points is determined based on the measured phase difference.
15 Citations
18 Claims
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1. System for determining a position of a transponder, which transmits a signal and moves along a route with at least a measuring station comprising antenna means for receiving said signal at least at two measuring points positioned at the two outer points of a line segment which crosses the course in a perpendicular manner, wherein said measuring station comprises:
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a first receiver for receiving said signal through said antenna means at the one measuring point, a second receiver for receiving said signal through said antenna means at the other measuring point, high frequency phase measuring means measuring the phase difference between the output signal of the first receiver and the output signal of the second receiver, evaluation means which, based on the measured phase difference, determines where the transponder passes said line segment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for determining a position of a transponder, which transmits a signal and moves along a route, the system comprising:
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an antenna assembly having a first point of measurement and a second point of measurement, the points of measurement configured to define a line segment which crosses the course in a perpendicular manner, the antenna assembly adapted to receive said signal at each point of measurement; a first receiver coupled to the antenna assembly and adapted to provide a first output signal based on said signal as received at the first point of measurement; a second receiver coupled to the antenna assembly and adapted to provide a second output signal based on said signal as received at the second point of measurement; a phase measuring unit coupled to the first receiver and the second receiver, the phase measuring unit adapted to provide a phase output signal based on a phase difference between the first output signal of the first receiver and the second output signal of the second receiver; and an evaluation unit coupled to the phase measuring unit and adapted to determine a position of the transponder along the line segment based on the phase output signal. - View Dependent Claims (10, 11, 12, 13)
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14. A method for determining a position of a transponder, which transmits a signal and moves along a route, the method comprising:
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providing a first signal based on said signal as received at a first point of measurement; providing a second signal based on said signal as received at a second point of measurement, the second point of measurement being positioned relative to the first point of measurement to define a line segment which crosses the course in a perpendicular manner; measuring a phase difference between the first signal and the second signal; and determining a position of the transponder along the line segment based on the measured phase difference of the first and second signals. - View Dependent Claims (15, 16, 17, 18)
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Specification