DETECTION AND SIGNAL ISOLATION OF INDIVIDUAL VEHICLE SIGNATURES
First Claim
1. A system for detecting objects moving along a path, the system comprising:
- a plurality of sensors; and
a processing circuit connected to the sensors,the processing circuit being configured to;
receive a plurality of digital time records of acoustic data, each representing a signal sensed by a respective one of the plurality of sensors,form a plurality of complex spectrogram structures, each of the complex spectrogram structures being formed from a respective one of the digital time records, each element of the complex spectrogram structure having a frequency coordinate and a time coordinate,form a movement structure from the complex spectrogram structures, each element of the movement structure corresponding to a respective element of the complex spectrogram structure and having a value corresponding to an angle of arrival of an acoustic wave at the frequency of the frequency coordinate of the element of the movement structure,fit a movement model to the movement structure, the movement model representing an object moving with constant velocity along the path; and
infer a velocity of a first object from the fit.
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Accused Products
Abstract
A system for isolating signals from individual vehicles. An array of sensors generates a plurality of time records. The time records are transformed into spectrogram structures, and for each time-frequency point in the spectrogram structures, a bearing is calculated, to form a movement structure. A Hough transform is used to fit a movement model to the movement structure, to form a Hough transform structure. Peaks in the Hough transform structure correspond to vehicles and their position in the Hough transform structure correspond to motion parameters, such as the velocity of the vehicle, and the time of closest approach of the vehicle to the array of acoustic sensors. A model of the motion of a vehicle is then used to associate, with the vehicle, points (e.g., structure elements in the spectrogram structures) from the data.
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Citations
20 Claims
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1. A system for detecting objects moving along a path, the system comprising:
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a plurality of sensors; and a processing circuit connected to the sensors, the processing circuit being configured to; receive a plurality of digital time records of acoustic data, each representing a signal sensed by a respective one of the plurality of sensors, form a plurality of complex spectrogram structures, each of the complex spectrogram structures being formed from a respective one of the digital time records, each element of the complex spectrogram structure having a frequency coordinate and a time coordinate, form a movement structure from the complex spectrogram structures, each element of the movement structure corresponding to a respective element of the complex spectrogram structure and having a value corresponding to an angle of arrival of an acoustic wave at the frequency of the frequency coordinate of the element of the movement structure, fit a movement model to the movement structure, the movement model representing an object moving with constant velocity along the path; and infer a velocity of a first object from the fit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for detecting objects moving along a path, the method comprising:
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receiving a plurality of digital time records of data, each representing a signal sensed by a respective one of a plurality of sensors, forming a plurality of complex spectrogram structures, each of the complex spectrogram structures being formed from a respective one of the digital time records, each element of the complex spectrogram structure having a frequency coordinate and a time coordinate, forming a movement structure from the complex spectrogram structure, each element of the movement structure corresponding to a respective element of the complex spectrogram structure and having a value corresponding to an angle of arrival of a signal at the frequency of the frequency coordinate of the element of the movement structure, fitting a movement model to the movement structure, the movement model representing an object moving with constant velocity along the path; and inferring a velocity of a first object from the fit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification