Systems and methods for estimating traffic signal information
First Claim
1. A method of estimating traffic signal information and adjusting an operation of an on-board system of a vehicle, the method comprising:
- obtaining positioning system data from each of a plurality of vehicles, wherein said positioning system data for each of the plurality of vehicles comprises position and velocity of a vehicle as functions of time;
for an intersection having a traffic signal, estimating an average acceleration of the vehicles when leaving the intersection;
for each of a subset of the vehicles, estimating a start time at which the respective vehicle leaves the intersection based on the positioning system data for the respective vehicle and the average acceleration;
wherein the subset of vehicle is determined by;
selecting vehicles whose positioning system data include data points within a distance interval surrounding the intersection, wherein at least a first one of the data points is before the intersection and at least a second one of the data points is after the intersection,removing vehicles from the subset whose velocity is lower, at a point either before the intersection or after the intersection, than a threshold;
estimating a cycle time of the traffic signal by;
for each pair of consecutive vehicles in the subset, calculating a difference between the start times of the vehicles, andsolving an optimization problem based on the differences and the cycle time; and
adjusting the operation of the on-board system of the vehicle based, at least in part, on an estimated start of a future green phase of the traffic signal.
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Abstract
Traffic signal information is estimated based on positioning system data obtained from a plurality of vehicles. Each data set includes the position and the velocity of a vehicle as functions of time. For an intersection having a traffic signal, an average acceleration of the vehicles when leaving the intersection is estimated, and an average deceleration of the vehicles when approaching the intersection is estimated. For each of a subset of the vehicles, a stop duration at the intersection is estimated based on the average acceleration, the average deceleration, and the positioning system data for the respective vehicle. A duration of a red phase of the traffic signal is estimated based on the stop duration of each of the subset of the vehicles.
23 Citations
14 Claims
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1. A method of estimating traffic signal information and adjusting an operation of an on-board system of a vehicle, the method comprising:
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obtaining positioning system data from each of a plurality of vehicles, wherein said positioning system data for each of the plurality of vehicles comprises position and velocity of a vehicle as functions of time; for an intersection having a traffic signal, estimating an average acceleration of the vehicles when leaving the intersection; for each of a subset of the vehicles, estimating a start time at which the respective vehicle leaves the intersection based on the positioning system data for the respective vehicle and the average acceleration; wherein the subset of vehicle is determined by; selecting vehicles whose positioning system data include data points within a distance interval surrounding the intersection, wherein at least a first one of the data points is before the intersection and at least a second one of the data points is after the intersection, removing vehicles from the subset whose velocity is lower, at a point either before the intersection or after the intersection, than a threshold; estimating a cycle time of the traffic signal by; for each pair of consecutive vehicles in the subset, calculating a difference between the start times of the vehicles, and solving an optimization problem based on the differences and the cycle time; and adjusting the operation of the on-board system of the vehicle based, at least in part, on an estimated start of a future green phase of the traffic signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of estimating traffic signal information and adjusting an operation of an on-board system of a vehicle, the method comprising:
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obtaining positioning system data from each of a plurality of vehicles, wherein said positioning system data for each of the plurality of vehicles comprises position and velocity of a vehicle as functions of time; for an intersection having a traffic signal, estimating an average acceleration of the vehicles when leaving the intersection; for each of a subset of the vehicles, estimating a start time at which the respective vehicle leaves the intersection based on the positioning system data for the respective vehicle and the average acceleration; estimating a cycle time of the traffic signal by; for each pair of consecutive vehicles in the subset, calculating a difference between the start times of the vehicles, and solving an optimization problem based on the differences and the cycle time; adjusting the operation of the on-board system of the vehicle based, at least in part, on an estimated start of a future green phase of the traffic signal; fitting a Gaussian mixture model to a histogram of a remainder of a division of the difference and the cycle time; and estimating a signal offset caused by a schedule change of the traffic signal based on clusters within the Gaussian mixture model. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification