Vehicular Traffic Surveillance Doppler Radar System
First Claim
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1. A vehicular traffic surveillance Doppler radar system, the system comprising:
- a source vehicle;
a multiple vehicle environment comprising a plurality of target vehicles, each of the plurality of target vehicles having a range; and
a direction-sensing Doppler radar associated with the source vehicle, the Doppler radar for performing a quadrature demodulation on reflected modulated FM signals received from at least a portion of the plurality of target vehicles and determining a range measurement for the at least a portion of the plurality of target vehicles based upon phase angle measurements derived therefrom.
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Abstract
A vehicular traffic surveillance Doppler radar system and method for use of the same are disclosed. In one embodiment, the system comprises a modulation circuit portion for generating modulated FM signals. An antenna circuit portion transmits the modulated FM signals to a target and receives the reflected modulated FM signals therefrom. A ranging circuit portion performs a quadrature demodulation on the reflected modulated FM signals and determines a range measurement based upon phase angle measurements derived therefrom.
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Citations
20 Claims
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1. A vehicular traffic surveillance Doppler radar system, the system comprising:
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a source vehicle; a multiple vehicle environment comprising a plurality of target vehicles, each of the plurality of target vehicles having a range; and a direction-sensing Doppler radar associated with the source vehicle, the Doppler radar for performing a quadrature demodulation on reflected modulated FM signals received from at least a portion of the plurality of target vehicles and determining a range measurement for the at least a portion of the plurality of target vehicles based upon phase angle measurements derived therefrom. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A vehicular traffic surveillance Doppler radar system, the system comprising:
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a source vehicle; a multiple vehicle environment comprising a plurality of target vehicles, each of the plurality of target vehicles having a range with respect to the source vehicle, speed, and radar cross-section; and a direction-sensing Doppler radar associated with the source vehicle, the Doppler radar for performing Fourier transforms on reflected modulated FM signals received at the source vehicle and determining respective ranges and speeds of each of the plurality of target vehicles independently of the respective radar cross-sections of the plurality of vehicles. - View Dependent Claims (8, 9, 10)
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11. A method for operating a vehicular traffic surveillance Doppler radar, the method comprising:
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transmitting modulated FM signals from a Doppler radar to first and second targets; receiving first reflected modulated FM signals at the Doppler radar from the first target; receiving second reflected modulated FM signals at the Doppler radar from the second target; transforming the received first and second reflected modulated FM signals to target spectrum; analyzing frequency signal differentials associated with the target spectrum to determine respective speeds of the first and second targets; and analyzing phase angle signal differentials associated with the target spectrum to determine respective ranges of the first and second targets. - View Dependent Claims (12, 13, 14, 15)
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16. A system for operating a vehicular traffic surveillance Doppler radar, the system comprising:
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means for transmitting modulated FM signals from a Doppler radar to first and second targets; means for receiving first reflected modulated FM signals at the Doppler radar from the first target; means for receiving second reflected modulated FM signals at the Doppler radar from the second target; means for transforming the received first and second reflected modulated FM signals to target spectrum; means for analyzing frequency signal differentials associated with the target spectrum to determine respective speeds of the first and second targets; and means for analyzing phase angle signal differentials associated with the target spectrum to determine respective ranges of the first and second targets. - View Dependent Claims (17, 18, 19, 20)
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Specification