Vehicular traffic surveillance doppler radar system
AssigneeApplied Concepts, Inc.
InventorJohn L. Aker
Life of this patent
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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.
Claims13
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 determine, for the target, a range measurement based upon phase angle measurements derived therefrom.
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:
- 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 determine a range measurement for the at least a portion of the plurality of target vehicles based upon phase angle measurements derived therefrom.
A method for operating a vehicular traffic surveillance Doppler radar, the method comprising:
- 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;
- 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.
Dependencies are inferred from the claim text.