Methods and systems for determining vehicle position in an automatic vehicle identification system
First Claim
1. A method of estimating vehicle location in a roadway using an automatic vehicle identification system, the system including an antenna defining a coverage area for communicating with a transponder mounted to a vehicle in the roadway, the method comprising:
- receiving a set of response signals from the transponder at points in time and determining a range rate of the transponder relative to the antenna at each point in time to obtain a plurality of range rates;
identifying a minima in the magnitude of the plurality of range rates;
estimating a first position of the transponder at a first time corresponding to the occurrence of the minima;
estimating a velocity of the vehicle based upon one or more of the plurality of range rates; and
estimating a second position of the transponder based upon the first position and the velocity.
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Accused Products
Abstract
Methods of estimating vehicle location in a roadway using an automatic vehicle identification system are described. The methods involve receiving a set of response signals from a vehicle-mounted transponder at points in time and determining a range rate of the transponder relative to the antenna at each point in time; identifying a minima in the magnitude of the range rate; estimating a first position of the transponder at a first time corresponding to the occurrence of the minima; estimating a velocity of the vehicle based upon one or more of the determined range rates; and estimating a second position of the transponder based upon the first position and the velocity.
29 Citations
27 Claims
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1. A method of estimating vehicle location in a roadway using an automatic vehicle identification system, the system including an antenna defining a coverage area for communicating with a transponder mounted to a vehicle in the roadway, the method comprising:
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receiving a set of response signals from the transponder at points in time and determining a range rate of the transponder relative to the antenna at each point in time to obtain a plurality of range rates; identifying a minima in the magnitude of the plurality of range rates; estimating a first position of the transponder at a first time corresponding to the occurrence of the minima; estimating a velocity of the vehicle based upon one or more of the plurality of range rates; and estimating a second position of the transponder based upon the first position and the velocity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 27)
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14. An automatic vehicle identification system for identifying the position in a roadway of a vehicle, the system comprising:
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an antenna for communicating with a transponder mounted to the vehicle in the roadway; a transceiver for broadcasting a continuous wave signal over the antenna and for receiving response signals from the transponder; a memory storing vehicle position locating instructions; and a processor, which when executing the vehicle position locating instructions, is configured to; determine a plurality of range rates of the transponder relative to the antenna based upon response signals received at points in time, identify a minima in the magnitude of the plurality of range rates, estimate a first position of the transponder at a first time corresponding to the occurrence of the minima, estimate a velocity of the vehicle based upon one or more of the plurality of range rates, and estimate a second position of the transponder based upon the first position and the velocity. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification