Vehicular traffic surveillance doppler radar system
First Claim
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1. A vehicular traffic surveillance Doppler radar comprising:
- an antenna circuit portion configured to receive reflected modulated FM signals from a target;
a ranging circuit portion configured to perform a quadrature demodulation on the reflected modulated FM signals; and
the ranging circuit portion configured to;
acquire a first buffer of data associated with a first frequency of the reflected modulated FM signals while analyzing a second buffer of data associated with a second frequency of the reflected modulated FM signals, anddetermine, for the target, a range measurement based upon phase values derived from the data of the second buffer.
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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
16 Claims
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1. A vehicular traffic surveillance Doppler radar comprising:
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an antenna circuit portion configured to receive reflected modulated FM signals from a target; a ranging circuit portion configured to perform a quadrature demodulation on the reflected modulated FM signals; and the ranging circuit portion configured to; acquire a first buffer of data associated with a first frequency of the reflected modulated FM signals while analyzing a second buffer of data associated with a second frequency of the reflected modulated FM signals, and determine, for the target, a range measurement based upon phase values derived from the data of the second buffer. - View Dependent Claims (2, 3)
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4. A vehicular traffic surveillance Doppler radar for use in a multiple vehicle environment including a plurality of target vehicles, the vehicle traffic surveillance Doppler radar comprising:
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a direction-sensing Doppler radar associated with a source vehicle; the Doppler radar configured to perform a quadrature demodulation on reflected modulated FM signals received from at least a portion of a plurality of target vehicles; the Doppler radar configured to; acquire a first buffer of data associated with a first frequency of the reflected modulated FM signals while analyzing a second buffer of data associated with a second frequency of the reflected modulated FM signals, and determine, for the at least a portion of the plurality of target vehicles, a range measurement based upon phase values derived from the data of the second buffer. - View Dependent Claims (5, 6, 7, 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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receiving first reflected modulated FM signals at the Doppler radar from a first target; receiving second reflected modulated FM signals at the Doppler radar from a second target; acquiring a first buffer of data associated with a first frequency of the first reflected modulated FM signals and the second reflected modulated FM signals while transforming data of a second buffer associated with a second frequency of the first reflected modulated FM signals and the 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, 16)
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Specification