Vehicular traffic surveillance Doppler radar system
DCFirst Claim
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1. A vehicular traffic surveillance Doppler radar system, the system comprising:
- a modulation circuit portion for generating modulated FM signals;
an antenna circuit portion for transmitting the modulated FM signals to a target and receiving reflected modulated FM signals therefrom; and
a ranging circuit portion for performing a quadrature demodulation on the reflected modulated FM signals and determining a range measurement 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
42 Claims
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1. A vehicular traffic surveillance Doppler radar system, the system comprising:
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a modulation circuit portion for generating modulated FM signals; an antenna circuit portion for transmitting the modulated FM signals to a target and receiving reflected modulated FM signals therefrom; and a ranging circuit portion for performing a quadrature demodulation on the reflected modulated FM signals and determining a range measurement based upon phase angle measurements derived therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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 a target; receiving reflected modulated FM signals at the Doppler radar from the target; performing a quadrature demodulation on the reflected modulated FM signals; and determining a range measurement of the target based upon phase angle measurements associated with the quadrature demodulated reflected modulated FM signals. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A vehicular traffic surveillance Doppler radar system, the system comprising:
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means for transmitting modulated FM signals from the Doppler radar to a target; means for receiving reflected modulated FM signals at the Doppler radar from the target; means for performing a quadrature demodulation on the reflected modulated FM signals; and means for determining a range measurement of the target based upon phase angle measurements associated with the quadrature demodulated reflected modulated FM signals. - View Dependent Claims (15, 16, 17, 18)
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19. A vehicular traffic surveillance Doppler radar system, the system comprising:
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a source vehicle having a direction-sensing Doppler radar that transmits modulated FM signals and receives reflected modulated FM signals; and a target vehicle having a speed and a range with respect to the source vehicle, the target vehicle reflecting the modulated FM signals as the reflected modulated FM signals, wherein the direction-sensing Doppler radar is operable to determine the speed and the range and, based thereupon, assess a risk of collision between the source vehicle and the target vehicle. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A method for avoiding collisions, the method comprising:
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transmitting modulated FM signals to a target vehicle from a Doppler radar associated with a source vehicle; receiving reflected modulated FM signals at the Doppler radar from the target vehicle; determining a range measurement of the target vehicle based upon phase angle measurements associated with the reflected modulated FM signals; determining a speed measurement of the target vehicle based upon frequency signal differentials associated with the transmitted and reflected modulated FM signals; and responsive to the range measurement and the speed measurement, determining a risk of collision between the source vehicle and the target vehicle. - View Dependent Claims (28, 29, 30)
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31. A method for determining a range of a target, the method comprising:
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transmitting modulated FM signals from a Doppler radar to the target; receiving reflected modulated FM signals at the Doppler radar; converting reflected modulated FM signals into digital samples; performing a complex fast Fourier transform on the digital samples to generate an approaching target spectrum and a receding target spectrum; searching at least one of the spectrum for the target; and calculating the range of the target based upon phase angle signals associated with the target. - View Dependent Claims (32, 33, 34, 35, 36)
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37. A system for determining a range of a target, the system comprising:
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means for transmitting modulated FM signals from a Doppler radar to the target; means for receiving reflected modulated FM signals at the Doppler radar; means for converting reflected modulated FM signals into digital samples; means for performing a complex fast Fourier transform on the digital samples to generate an approaching target spectrum and a receding target spectrum; means for searching at least one of the spectrum for the target; and means for calculating the range of the target based upon phase angle signal differentials associated with the target. - View Dependent Claims (38, 39, 40, 41, 42)
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Specification