Collision predicting operation system
First Claim
1. A collision predicting operation system comprising:
- electromagnetic wave generating means whose oscillation frequency is varied in accordance with an input voltage thereto;
antenna means for radiating said electromagnetic wave and for receiving a reflected wave reflected from a target due to the encounter of said electromagnetic wave with said target;
means for causing said reflected wave to interfere with a part of said electromagnetic wave to generate a doppler signal;
periodic wave generating means connected to said doppler signal generating means and including circuitry responsive only to a doppler signal having an amplitude higher than a predetermined value and a frequency within a predetermined range to produce a periodic wave synchronized with said doppler signal and having a rise portion occurring when the phase angle of the doppler signal is zero;
frequency modulating means connected to said electromagnetic wave generating means and said periodic wave generating means, said frequency modulating means including circuit means response to the rise of said periodic wave for changing the input voltage to said electromagnetic wave generating means in synchronization with the occurrence of said zero phase angle of said doppler signal thereby changing the oscillation frequency of said electromagnetic wave generating means; and
means for detecting the polarity and phase of the modulated portion of said doppler signal.
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Abstract
There is provided a collision predicting operation system comprising a radar circuit whereby a reflected wave which has been radiated from an oscillator and encountered and reflected from a target is received and caused to interfere with the radiated wave to generate a doppler signal, an oscillator circuit group for generating a periodic wave synchronized with the doppler signal when the amplitude of the doppler signal is higher than a predetermined value and its frequency is within a predetermined range, means for changing the oscillation frequency of the oscillator in synchronization with the periodic wave, and means for detecting the polarity and the amount of change of the phase of the doppler signal changed by the frequency modulating means.
54 Citations
4 Claims
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1. A collision predicting operation system comprising:
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electromagnetic wave generating means whose oscillation frequency is varied in accordance with an input voltage thereto; antenna means for radiating said electromagnetic wave and for receiving a reflected wave reflected from a target due to the encounter of said electromagnetic wave with said target; means for causing said reflected wave to interfere with a part of said electromagnetic wave to generate a doppler signal; periodic wave generating means connected to said doppler signal generating means and including circuitry responsive only to a doppler signal having an amplitude higher than a predetermined value and a frequency within a predetermined range to produce a periodic wave synchronized with said doppler signal and having a rise portion occurring when the phase angle of the doppler signal is zero; frequency modulating means connected to said electromagnetic wave generating means and said periodic wave generating means, said frequency modulating means including circuit means response to the rise of said periodic wave for changing the input voltage to said electromagnetic wave generating means in synchronization with the occurrence of said zero phase angle of said doppler signal thereby changing the oscillation frequency of said electromagnetic wave generating means; and means for detecting the polarity and phase of the modulated portion of said doppler signal. - View Dependent Claims (2, 3)
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4. A collision predicting operation system comprising:
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transmitting means for radiating a transmission wave towards a target; antenna means for receiving a reflected wave reflected from said target; interference means connected to said transmitting means and said antenna for causing said reflected wave received by said antenna to interfere with a part of said transmission wave branched from said transmission wave to obtain a doppler signal; periodic wave generating means connected to said interference means and including circuitry responsive only to a doppler signal having an amplitude higher than a predetermined value and a frequency within a predetermined range, said circuitry including an oscillator whose oscillation frequency and phase are adjustable to obtain a periodically occurring wave whose frequency and phase coincide with those of said doppler signal, said circuitry further comprising means responsive to the periodically occurring wave to produce a periodic rectangular wave synchronized with said doppler signal and having a rise portion occurring when the phase angle of the doppler signal is zero; frequency modulating means, including circuit means responsive to said periodic rectangular wave from said periodic wave generating means, for modulating the frequency of said transmission wave in synchronization with the occurrence of said zero phase angle of said doppler signal; and means connected to said frequency modulating means for detecting the polarity and phase of the modulated portion of said doppler signal.
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Specification