Systems and methods for monitoring speed
First Claim
Patent Images
1. A method for measuring a speed of a vehicle approaching an intersection as the vehicle passes through a field of view of a dual transducer sensor configuration, the method comprising:
- receiving one or more signals at a first transducer of the dual sensor configuration, the one or more signals received at the first transducer being reflected off of or emanating from a vehicle as the vehicle passes through a first field of view of the first transducer;
receiving one or more signals at a second transducer of the dual transducer sensor configuration, each of the one or more signals received at the second transducer having a time delay relative to a corresponding signal received at the first transducer resulting in a series of time delays between signals received at the first transducer and signals received at the second transducer, the one or more signals received at the second transducer being reflected off of or emanating from the vehicle as the vehicle passes through a second field of view of the second transducer, wherein the second field of view at least partially overlaps with the first field of view;
performing a plurality of correlations between the one or more signals received at the first transducer and the one or more signals received at the second transducer, wherein the result is a correlation function indicating the correlation between signals received at the first transducer and signals received at the second transducer for the series of time delays;
identifying a time delay, from among the series of time delays, corresponding to a peak correlation in the correlation function;
determining the speed of the vehicle using the identified time delay and a distance between the first transducer and the second transducer;
using the determined speed to monitor the safety of the intersection;
the first transducer transmitting one or more transmitted signals into the field of view of the first transducer; and
the second transducer transmitting one or more transmitted signals into the field of view of the second transducer such that the one or more transmitted signals transmitted into the field of view of the second transducer at least partially overlap with the one or more transmitted signals transmitted into the field of view of the first transducer.
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0 Petitions
Accused Products
Abstract
Systems and methods for measuring the speed and/or direction of a target such as a vehicle in a field of view. The speed of a vehicle is measured using distance measurements, phase measurements, or Doppler shift measurements using a single transducer side fire configured sensor. The speed of a vehicle can be measured using laterally spaced transducers in a side fire or off angle configuration and using a single transducer sensor in a forward fire configuration.
120 Citations
28 Claims
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1. A method for measuring a speed of a vehicle approaching an intersection as the vehicle passes through a field of view of a dual transducer sensor configuration, the method comprising:
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receiving one or more signals at a first transducer of the dual sensor configuration, the one or more signals received at the first transducer being reflected off of or emanating from a vehicle as the vehicle passes through a first field of view of the first transducer; receiving one or more signals at a second transducer of the dual transducer sensor configuration, each of the one or more signals received at the second transducer having a time delay relative to a corresponding signal received at the first transducer resulting in a series of time delays between signals received at the first transducer and signals received at the second transducer, the one or more signals received at the second transducer being reflected off of or emanating from the vehicle as the vehicle passes through a second field of view of the second transducer, wherein the second field of view at least partially overlaps with the first field of view; performing a plurality of correlations between the one or more signals received at the first transducer and the one or more signals received at the second transducer, wherein the result is a correlation function indicating the correlation between signals received at the first transducer and signals received at the second transducer for the series of time delays; identifying a time delay, from among the series of time delays, corresponding to a peak correlation in the correlation function; determining the speed of the vehicle using the identified time delay and a distance between the first transducer and the second transducer; using the determined speed to monitor the safety of the intersection; the first transducer transmitting one or more transmitted signals into the field of view of the first transducer; and the second transducer transmitting one or more transmitted signals into the field of view of the second transducer such that the one or more transmitted signals transmitted into the field of view of the second transducer at least partially overlap with the one or more transmitted signals transmitted into the field of view of the first transducer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for measuring a speed of a vehicle approaching an intersection as the vehicle passes through a field of view of a dual transducer sensor configuration, the method comprising:
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receiving one or more signals at a first transducer of the dual transducer sensor configuration, the one or more signals received at the first transducer being reflected off of or emanating from a vehicle as the vehicle passes through the field of view of the first transducer; receiving one or more signals at a second transducer of the dual transducer sensor configuration, each of the one or more signals received at the second transducer having a time delay relative to a corresponding signals received at the first transducer resulting in a series of time delays between signals received at the first transducer and signals received at the second transducer, the one or more signals received at the second transducer being reflected off of or emanating from the vehicle as the vehicle passes through the field of view of the second transducer; performing a plurality of correlations between the one or more signals received at the first transducer and the one or more signals received at the second transducer, wherein the result is a correlation function indicating the correlation between signals received at the first transducer and signals received at the second transducer for the series of time delays; identifying a time delay, from among the series of time delays, corresponding to a peak correlation in the correlation function; determining the speed of the vehicle using the identified time delay and a distance between the first transducer and the second transducer; using the determined speed to monitor the safety of the intersection the first transducer transmitting one or more transmitted signals into the field of view of the first transducer; and the second transducer transmitting one or more transmitted signals into the field of view of the second transducer such that the one or more transmitted signals transmitted into the field of view of the second transducer at least partially overlap with the one or more transmitted signals transmitted into the field of view of the first transducer. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for measuring a speed of a vehicle on a roadway as the vehicle passes through a field of view of a dual transducer sensor configuration, the method comprising:
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receiving one or more signals at a first transducer of the dual transducer sensor configuration, the one or more signals received at the first transducer being reflected off of or emanating from a vehicle as the vehicle passes through the field of view of the first transducer; receiving one or more signals at a second transducer of the dual transducer sensor configuration, each of the one or more signals received at the second transducer having a time delay relative to a corresponding signal received at the first transducer resulting in a series of time delays between signals received at the first transducer and signals received at the second transducer, the one or more signals received at the second transducer being reflected off of or emanating from the vehicle as the vehicle passes through the field of view of the second transducer, wherein the field of view of the second transducer at least partially overlaps with the field of view of the first transducer; performing a plurality of correlations between the one or more signals received at the first transducer and the one or more signals received at the second transducer, wherein the result is a correlation function indicating the correlation between signals received at the first transducer and signals received at the second transducer for the series of time delays; identifying a time delay, from among the series of time delays, corresponding to a peak correlation in the correlation function; determining the speed of the vehicle using the identified time delay and a distance between the first transducer and the second transducer; using the determined speed to monitor traffic on the roadway the first transducer transmitting one or more transmitted signals into the field of view of the first transducer; and the second transducer transmitting one or more transmitted signals into the field of view of the second transducer such that the one or more transmitted signals transmitted into the field of view of the second transducer at least partially overlap with the one or more transmitted signals transmitted into the a field of view of the first transducer. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A method for measuring a speed of a vehicle on a roadway as the vehicle passes through a field of view of a dual transducer sensor configuration, the method comprising:
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receiving one or more signals at a first transducer of the dual transducer sensor configuration, the one or more signals received at the first transducer being reflected off of or emanating from a vehicle as the vehicle passes through the field of view of the first transducer; receiving one or more signals at a second transducer of the dual transducer sensor configuration, each of the one or more signals received at the second transducer having a time delay relative to a corresponding signal received at the first transducer resulting in a series of time delays between signals received at the first transducer and signals received at the second transducer, the one or more signals received at the second transducer being reflected off of or emanating from the vehicle as the vehicle passes through the field of view of the second transducer; performing a plurality of correlations between the one or more signals received at the first transducer and the one or more signals received at the second transducer, wherein the result is a correlation function indicating the correlation between signals received at the first transducer and signals received at the second transducer for the series of time delays; identifying a time delay, from among the series of time delays, corresponding to a peak correlation in the correlation function; determining the speed of the vehicle using the identified time delay and a distance between the first transducer and the second transducer; using the determined speed to monitor traffic on the roadway; the first transducer transmitting one or more transmitted signals into the field of view of the first transducer; and the second transducer transmitting one or more transmitted signals into the field of view of the second transducer such that the one or more transmitted signals transmitted into the field of view of the second transducer at least partially overlap with the one or more transmitted signals transmitted into the field of view of the first transducer. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification