Radar system and method of operating same
First Claim
1. A method of operating a radar receiver comprising the steps of:
- (a) sampling received signals at a predetermined sampling rate to periodically provide a set of selected samples, the set of selected samples including positive going ramp samples, negative going ramp samples and CW burst samples;
(b) performing a first fast Fourier transform on the positive going ramp samples, performing a second fast Fourier transform on the negative going ramp samples and performing a third fast Fourier transform on the CW burst samples;
(c) tracking one or more signals provided from the first fast Fourier transform performing step, wherein each of the one or more signals provided from the first fast Fourier transform performing step represents a corresponding target and said tracking step provides range, range rate, and acceleration of each corresponding target;
(d) tracking one or more signals provided from the second fast Fourier transform performing step wherein each of the one or more signals provided from the second fast Fourier transform performing step represents a corresponding target and said tracking step provides range, range rate, and acceleration of each corresponding target;
(e) tracking one or more signals provided from the third fast Fourier transform performing step wherein each of the one or more signals provided from the third fast Fourier transform performing step represents a corresponding target and said tracking step provides range, range rate, and acceleration of each corresponding target; and
(f) associating the signals from the tracking steps in a track combiner to periodically provide output signals corresponding to track states of each of the corresponding targets.
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Accused Products
Abstract
A method of operating a radar system, including the steps of digitally sampling a received signal at a predetermined sampling rate, to periodically provide a set of selected samples, the set of selected samples including positive going ramp samples, negative going ramp samples and CW burst samples and performing a first fast Fourier transform (FFT) on the positive going ramp samples, performing a second fast Fourier transform on the negative going ramp samples and performing a third fast Fourier transform on the CW burst samples is described. Utilizing the subsequent radar operations the method further includes the steps of tracking each resulting signal from the first fast Fourier transform performing steps, tracking each resulting signal from the second fast Fourier transform performing steps and tracking each resulting signal from the third fast Fourier transform performing steps and associating any resulting signals from the tracking steps to periodically provide output signals indicative of other vehicles.
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Citations
20 Claims
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1. A method of operating a radar receiver comprising the steps of:
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(a) sampling received signals at a predetermined sampling rate to periodically provide a set of selected samples, the set of selected samples including positive going ramp samples, negative going ramp samples and CW burst samples; (b) performing a first fast Fourier transform on the positive going ramp samples, performing a second fast Fourier transform on the negative going ramp samples and performing a third fast Fourier transform on the CW burst samples; (c) tracking one or more signals provided from the first fast Fourier transform performing step, wherein each of the one or more signals provided from the first fast Fourier transform performing step represents a corresponding target and said tracking step provides range, range rate, and acceleration of each corresponding target; (d) tracking one or more signals provided from the second fast Fourier transform performing step wherein each of the one or more signals provided from the second fast Fourier transform performing step represents a corresponding target and said tracking step provides range, range rate, and acceleration of each corresponding target; (e) tracking one or more signals provided from the third fast Fourier transform performing step wherein each of the one or more signals provided from the third fast Fourier transform performing step represents a corresponding target and said tracking step provides range, range rate, and acceleration of each corresponding target; and (f) associating the signals from the tracking steps in a track combiner to periodically provide output signals corresponding to track states of each of the corresponding targets. - View Dependent Claims (2, 13, 14, 15, 16, 17, 18, 19, 20)
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3. A radar receiver comprising:
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(a) means for sampling received signals at a predetermined sampling rate for periodically providing a set of selected samples, the set of selected samples comprising positive going ramp samples, negative going ramp samples and CW burst samples; (b) fast Fourier transform means for performing a first fast Fourier transform on the positive going ramp samples, for performing a second fast Fourier transform on the negative going ramp samples and for performing a third fast Fourier transform on the CW burst samples; (c) means for tracking one or more signals provided by the fast Fourier transform means wherein each of the one or more signals provided from the fast Fourier transform means represents a corresponding target and said means for tracking provides range, range rate, and acceleration of each corresponding target; and (d) means for associating the signals provided from the means for tracking to periodically provide output signals corresponding to track states of the corresponding targets. - View Dependent Claims (4)
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5. A frequency modulated continuous wave radar system comprising:
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(a) means for periodically transmitting a signal having a positive going frequency ramp portion, a negative going frequency ramp portion and a continuous wave burst portion; (b) means for receiving one or more signals returned from one or more targets; (c) means for sampling the received signal at a predetermined sampling rate and for periodically providing a set of selected samples, the set of selected samples comprising positive going ramp samples, negative going ramp samples and CW burst samples; (c) a fast Fourier transform processor for performing a first fast Fourier transform on the positive going ramp samples, a second fast Fourier transform on the negative going ramp samples and a third fast Fourier transform on the CW burst samples; (d) a target tracker for tracking each resulting signal provided by the fast Fourier transform processor; and (e) a track combiner to associate any resulting signals provided by the target tracker to periodically provide output signals corresponding to track states of each of the corresponding targets.
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6. A radar system comprising:
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means for decoupling range and range rate information from multiple objects along a roadway; means for assigning a priority to each of the multiple objects; means for identifying and verifying the presence of a moving object among the multiple objects and for changing the priority of the multiple objects based upon the presence of the moving object; and means for tracking the multiple objects. - View Dependent Claims (7, 8, 9)
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10. A method of target tracking comprising the steps of:
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(a) tracking, in a frequency space, at least one target in a field of view; (b) determining frequency, frequency rate and frequency acceleration values for each of the at least one target in the frequency space; (c) processing the frequency, frequency rate and frequency acceleration values for each of the at least one targets to decouple the range and range rate information in frequency space; (d) transforming the frequency, frequency rate and frequency acceleration values in the frequency space to equivalent range and range rate values in a time space for each of the at least one targets in the field of view; and (e) comparing the range and range rate values of each of the at least one targets to primary target range and range rate threshold requirement values. - View Dependent Claims (11, 12)
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Specification