Method for identifying a vehicle-borne transmitter
First Claim
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1. A method of identifying a vehicle-borne transmitter emitting an interfering signal over a predefined frequency band, the method comprising:
- monitoring the predefined frequency band at a first location to identify an emission of an interfering signal from a passing vehicle, wherein, if an interfering signal is detected, the method further includes;
capturing a first image of the passing vehicle to enable an identity of the passing vehicle to be determined,wherein the monitoring of the frequency band at the first location includes;
collecting phase change data corresponding to a change in a phase difference between a first phase and a second phase, the first phase being a phase of the interfering signal received at a first position and the second phase being a phase of the interfering signal received at a second position, andestimating from the phase change data a position of the passing vehicle in the image by;
fitting the phase change data to a phase change model, the phase change model being a model of the change in the phase difference between the first and second phase using a set of parameters, the parameters including a speed and track of a vehicle,determining parameters of the model,generating from the parameters of the model an estimated track and estimated speed of the passing vehicle, andusing the estimated track and estimated speed of the passing vehicle to determine a position of the passing vehicle within the captured image.
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Abstract
Some embodiments are directed to a method of identifying a vehicle-borne transmitter emitting an interfering signal over a predefined frequency band. The method comprises monitoring the predefined frequency band at a first location to identify an emission of an interfering signal from a passing vehicle. If an interfering signal is detected, the method further comprises capturing a first image of the passing vehicle to enable an identity of the passing vehicle to be determined.
10 Citations
28 Claims
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1. A method of identifying a vehicle-borne transmitter emitting an interfering signal over a predefined frequency band, the method comprising:
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monitoring the predefined frequency band at a first location to identify an emission of an interfering signal from a passing vehicle, wherein, if an interfering signal is detected, the method further includes; capturing a first image of the passing vehicle to enable an identity of the passing vehicle to be determined, wherein the monitoring of the frequency band at the first location includes; collecting phase change data corresponding to a change in a phase difference between a first phase and a second phase, the first phase being a phase of the interfering signal received at a first position and the second phase being a phase of the interfering signal received at a second position, and estimating from the phase change data a position of the passing vehicle in the image by; fitting the phase change data to a phase change model, the phase change model being a model of the change in the phase difference between the first and second phase using a set of parameters, the parameters including a speed and track of a vehicle, determining parameters of the model, generating from the parameters of the model an estimated track and estimated speed of the passing vehicle, and using the estimated track and estimated speed of the passing vehicle to determine a position of the passing vehicle within the captured image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 27, 28)
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14. A system for identifying a vehicle-borne transmitter emitting an interfering signal over a predefined frequency band, the system comprising:
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a detector positioned at a first location configured to monitor the predefined frequency band and to identify an emission of an interfering signal from a passing vehicle, and a camera that operates such that, if the detector detects an interfering signal, the detector is configured to send a trigger signal causing the camera to capture a first image of the passing vehicle thereby enabling an identity of the passing vehicle to be determined; wherein the detector operates such that the monitoring of the frequency band at the first location includes; collecting phase change data corresponding to a change in a phase difference between a first phase and a second phase, the first phase being a phase of the interfering signal received at a first position and the second phase being a phase of the interfering signal received at a second position, and estimating from the phase change data a position of the passing vehicle in the image by; fitting the phase change data to a phase change model, the phase change model being a model of the change in the phase difference between the first and second phase using a set of parameters, the parameters including a speed and track of a vehicle, determining parameters of the model, generating from the parameters of the model an estimated track and estimated speed of the passing vehicle, and using the estimated track and estimated speed of the passing vehicle to determine a position of the passing vehicle within the captured image. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification