US3732564A — Pulse doppler fuze

Claim 1

Independent Claim 183 words

In a proximity fuze circuit, an antenna, a normally ineffective superregenerative radio frequency oscillator coupled to said antenna, said oscillator generating a radio signal to be radiated by said antenna and developing a detected output correlative to the difference between said generated signal and any reflected portion thereof intercepted by said antenna during the period of effectiveness of said oscillator, a multivibrator coupled to said oscillator for applying periodic impulses of a constant duration and repetition rate thereto thereby rendering said oscillator effective for a predetermined period after each of the applied impulses, a second radio frequency oscillator coupled to said superregenerative oscillator and operating at substantially one-half of the natural frequency of said superregenerative oscillator, a source of electricity energizing said superregenerative oscillator, said second oscillator, and said multivibrator, said second oscillator providing a second harmonic signal to said superregenerative oscillator having an amplitude level large relative to the level of any spurious noises thereby to effect constancy in the initiation of each period of effectiveness and to render said detected output insensitive to weak external signals, such as spurious jamming signals.

Claim 2

Dependent Claim 183 words

In a proximity fuze circuit, an antenna, a normally ineffective superregenerative radio frequency oscillator coupled to said antenna, said oscillator generating a radio signal to be radiated by said antenna and developing a detected output correlative to the difference between said generated signal and any reflected portion thereof intercepted by said antenna during the period of effectiveness of said oscillator, a multivibrator coupled to said oscillator for applying periodic impulses of a constant duration and repetition rate thereto thereby rendering said oscillator effective for a predetermined period after each of the applied impulses, a second radio frequency oscillator coupled to said superregenerative oscillator and operating at substantially one-half of the natural frequency of said superregenerative oscillator, a source of electricity energizing said superregenerative oscillator, said second oscillator, and said multivibrator, said second oscillator providing a second harmonic signal to said superregenerative oscillator having an amplitude level large relative to the level of any spurious noises thereby to effect constancy in the initiation of each period of effectiveness and to render said detected output insensitive to weak external signals, such as spurious jamming signals.

Claim 3

Dependent Claim 237 words

In a proximity fuze circuit, an antenna for radiating a radio signal into the surrounding spatial region and for intercepting any portion thereof reflected from a target in the spAtial region, a superregenerative radio frequency oscillator coupled to said antenna and including a normally non-conductive electron discharge tube, said oscillator generating a radio signal to be radiated by said antenna upon said tube being rendered conductive and developing a detected output having an instantaneous frequency correlative to the difference between the generated signal and any portion thereof intercepted during the conductive period of said tube, a multivibrator coupled to said oscillator for applying to said tube a single train of periodic impulses of constant repetition rate and uniform duration for rendering said tube periodically conductive during a portion of the duration of each of the applied impulses, a second oscillator coupled to said superregenerative oscillator and operating at substantially one-half of the natural frequency of said superregenerative oscillator, said second oscillator providing a second harmonic signal to said tube having an amplitude level large relative to the level of any spurious noises thereby to effect constancy in the initiation of each period of effectiveness of said superregenerative oscillator and to render its detected output insensitive to weak external signals, such as spurious jamming signals, and means selectively responsive to the frequency of said detected output for exploding the proximity fuze at a lethal range from the target.

Claim 4

Dependent Claim 237 words

In a proximity fuze circuit, an antenna for radiating a radio signal into the surrounding spatial region and for intercepting any portion thereof reflected from a target in the spAtial region, a superregenerative radio frequency oscillator coupled to said antenna and including a normally non-conductive electron discharge tube, said oscillator generating a radio signal to be radiated by said antenna upon said tube being rendered conductive and developing a detected output having an instantaneous frequency correlative to the difference between the generated signal and any portion thereof intercepted during the conductive period of said tube, a multivibrator coupled to said oscillator for applying to said tube a single train of periodic impulses of constant repetition rate and uniform duration for rendering said tube periodically conductive during a portion of the duration of each of the applied impulses, a second oscillator coupled to said superregenerative oscillator and operating at substantially one-half of the natural frequency of said superregenerative oscillator, said second oscillator providing a second harmonic signal to said tube having an amplitude level large relative to the level of any spurious noises thereby to effect constancy in the initiation of each period of effectiveness of said superregenerative oscillator and to render its detected output insensitive to weak external signals, such as spurious jamming signals, and means selectively responsive to the frequency of said detected output for exploding the proximity fuze at a lethal range from the target.

Claim 5

Dependent Claim 230 words

In a circuit, an antenna, a superregenerative oscillator coupled to said antenna and including an electron discharge tube having at least a grid and an anode, said tube being normally biased to be non-conductive, said oscillator generating an electromagnetic signal to be radiated by said antenna and developing a detected output correlative to the frequency difference between the generated signal and any reflected portion thereof intercepted by said antenna during the conduction period of said tube, biasing means coupled to said grid for normally maintaining said tube non-conductive, a multivibrator coupled to said tube for applying to the grid thereof impulses of constant duration and rate of repetition, each of said impulses having an amplitude suitable for overcoming the effect of said biasing means and render said tube periodically conductive during a preselected portion of the duration of each of the applied impulses, and a continuous wave oscillator coupled to said tube anode in said superregenerative oscillator and operating at substantially one-half of the natural frequency of said superregenerative oscillator, said continuous wave oscillator providing a second harmonic signal having an amplitude level large relative to the level of any spurious noises thereby to effect a constancy in the buildup of oscillations of said superregenerative oscillator in response to each of the applied impulses and to render its detected output insensitive to weak external signals, such as spurious jamming signals.

Claim 6

Dependent Claim 230 words

In a circuit, an antenna, a superregenerative oscillator coupled to said antenna and including an electron discharge tube having at least a grid and an anode, said tube being normally biased to be non-conductive, said oscillator generating an electromagnetic signal to be radiated by said antenna and developing a detected output correlative to the frequency difference between the generated signal and any reflected portion thereof intercepted by said antenna during the conduction period of said tube, biasing means coupled to said grid for normally maintaining said tube non-conductive, a multivibrator coupled to said tube for applying to the grid thereof impulses of constant duration and rate of repetition, each of said impulses having an amplitude suitable for overcoming the effect of said biasing means and render said tube periodically conductive during a preselected portion of the duration of each of the applied impulses, and a continuous wave oscillator coupled to said tube anode in said superregenerative oscillator and operating at substantially one-half of the natural frequency of said superregenerative oscillator, said continuous wave oscillator providing a second harmonic signal having an amplitude level large relative to the level of any spurious noises thereby to effect a constancy in the buildup of oscillations of said superregenerative oscillator in response to each of the applied impulses and to render its detected output insensitive to weak external signals, such as spurious jamming signals.

Claim 7

Dependent Claim 224 words

In a circuit for a radio proximity fuze, an antenna for radiating a radio signal into the surrounding spatial region and for intercepting any portion thereof reflected from a target, a normally ineffective first radio frequency oscillator coupled to said antenna and functioning as a transmitter-detector during the period of effectiveness thereof whereby said oscillator generates a radio signal to be radiated by said antenna means and develops a detected output correlative to the frequency difference between the generated signal and any reflected portion intercepted during said period of effectiveness, a pulse source coupled to said oscillator and emitting pulses of a predetermined constant repetition rate and uniform length, a second radio frequency oscillator coupled to the said first oscillator and operating at substantially one-half of the natural frequency of said first oscillator, said second oscillator continually providing a second harmonic signal to said first oscillator of a preselected amplitude to effect a constancy in the buildup of oscillations of said first oscillator iN response to each of the applied impulses and to render its detected output insensitive to weak external signals, such as spurious jamming signals, an amplifier circuit coupled to said first oscillator for developing an initiating signal in response to a detected output of a predetermined frequency, and electroresponsive ignition means responsive to said initiating signals for detonating the proximity fuze.

Claim 8

Dependent Claim 224 words

In a circuit for a radio proximity fuze, an antenna for radiating a radio signal into the surrounding spatial region and for intercepting any portion thereof reflected from a target, a normally ineffective first radio frequency oscillator coupled to said antenna and functioning as a transmitter-detector during the period of effectiveness thereof whereby said oscillator generates a radio signal to be radiated by said antenna means and develops a detected output correlative to the frequency difference between the generated signal and any reflected portion intercepted during said period of effectiveness, a pulse source coupled to said oscillator and emitting pulses of a predetermined constant repetition rate and uniform length, a second radio frequency oscillator coupled to the said first oscillator and operating at substantially one-half of the natural frequency of said first oscillator, said second oscillator continually providing a second harmonic signal to said first oscillator of a preselected amplitude to effect a constancy in the buildup of oscillations of said first oscillator iN response to each of the applied impulses and to render its detected output insensitive to weak external signals, such as spurious jamming signals, an amplifier circuit coupled to said first oscillator for developing an initiating signal in response to a detected output of a predetermined frequency, and electroresponsive ignition means responsive to said initiating signals for detonating the proximity fuze.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-05-07	1976-11-06	1977-05-08	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-05-07	1980-11-06	1981-05-08	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-05-07	1984-11-06	1985-05-08	$7700.00	Window Closed / Lapsed

Pulse doppler fuze

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