System for preventing collision of vehicles

Claim 2

In a system for preventing a collision of a motor vehicle with a target object, a combination comprising a triggering pulse generator for generating a train of triggering pulses having a predetermined pulse repetition frequency, signal generator means driven by said triggering pulse generator for producing an energy signal and for radiating said signal toward a target, detector means for detecting a signal reflected from said target, gating pulse generator means for generating a train of gating pulses having a pulse repetition frequency identical to that of said triggering pulses and having a phase difference with respect to said triggering pulses determined by the speed of the vehicle, gate circuit means coupled to said gating pulse generator means and said detector means for producing an output signal proportional to said reflected signal upon receipt of said gating pulses, pulse height holding circuit means having said output signal applied thereto for producing and holding a peak value signal of the output signal from said gate circuit means at each period of the pulse repetition frequency, and integrator circuit means having said peak value signal applied thereto for integrating said peak value signal and for producing an integrated output signal, whereby the signal-to-noise ratio of the signal received by said detector means is increased to cause said signal reflected from said target to be efficiently sensed.

Claim 3

In a system for preventing a collision of a motor vehicle with a target object, a combination comprising a triggering pulse generator for generating a train of triggering pulses having a predetermined pulse repetition frequency; signal generator means driven by said triggering pulse generator for producing an energy signal and for radiating said signal toward A target; detector means for detecting a signal reflected from the target; first, second and third gating pulse generator means for generating respective trains of gating pulses each having a pulse repetition frequency identical to said triggering pulses and having different phase relationships with respect to said triggering pulses determined by predetermined low, moderate and high speeds of the vehicle; first, second and third gate circuit means coupled respectively to said first, second, and third gating pulse generator means, and coupled to said detector means, wherein said gate circuit means are for producing respective first, second and third output signals proportional to said reflected signal upon receipt of the respective gating pulses from said gating pulse generator means; first, second and third pulse height holding circuit means having said first, second and third output signals respectively applied thereto producing and holding respective first, second and third peak value signals from said gate circuit means at each period of the pulse repetition frequency; first, second and third integration circuit means having said first second and third peak value signals applied respectively thereto for integrating the respective peak value signals to produce first, second and third integrated output signals, and first, second and third collision preventive means having said first second and third integrated output signals applied thereto for producing collision preventive signals whereby the signal-to-noise ratio of the signal received by said detector means is increased to cause said signal reflected from said target to be efficiently sensed in different modes in accordance with the low, moderate and high speeds of the vehicle.

Claim 4

In a system for preventing a collision of a motor vehicle with a target object, a combination comprising a triggering pulse generator for generating a train of triggering pulses having a predetermined pulse repetition frequency; signal generator means driven by said triggering pulse generator for producing an energy signal and for radiating said signal toward A target; detector means for detecting a signal reflected from the target; first, second and third gating pulse generator means for generating respective trains of gating pulses each having a pulse repetition frequency identical to said triggering pulses and having different phase relationships with respect to said triggering pulses determined by predetermined low, moderate and high speeds of the vehicle; first, second and third gate circuit means coupled respectively to said first, second, and third gating pulse generator means, and coupled to said detector means, wherein said gate circuit means are for producing respective first, second and third output signals proportional to said reflected signal upon receipt of the respective gating pulses from said gating pulse generator means; first, second and third pulse height holding circuit means having said first, second and third output signals respectively applied thereto producing and holding respective first, second and third peak value signals from said gate circuit means at each period of the pulse repetition frequency; first, second and third integration circuit means having said first second and third peak value signals applied respectively thereto for integrating the respective peak value signals to produce first, second and third integrated output signals, and first, second and third collision preventive means having said first second and third integrated output signals applied thereto for producing collision preventive signals whereby the signal-to-noise ratio of the signal received by said detector means is increased to cause said signal reflected from said target to be efficiently sensed in different modes in accordance with the low, moderate and high speeds of the vehicle.