US3855595A — Frequency spectrum display for radar

Claim 1

Independent Claim 223 words

In a velocity-and-acceleration analyzing radar including means for displaying the velocity parameter of target-return signals, radar timing means, a velocity-and-acceleration analyzer, a video amplifier and a threshold circuit, means for displaying the doppler frequency spectrum of a selected signal comprising: velocity strobe means triggered by the radar timing means output signal for producing a pulse output which is adjustable as to time of occurrence with respect to the trigger pulse, the stobe pulse also being fed to said means for displaying the velocity parameter so that a particular target may be selected by adjusting the position of the pulse indication to coincide with the target-return indication; means for generating a high-speed sweep signal, said sweep means being connected to be triggered by the output from said velocity strobe means; adding means for adding its input signals, said adding means being connected to receive as input signals the thresholded video signal output of said threshold means and the strobe pulse from said velocity strobe means; and cathode ray tube means (CRT) for displaying the doppler frequency spectrum of said selected target return, said CRT means having the output of said high-speed sweep means connected to its horizontal deflection means, the output of said video amplifier connected to its vertical deflection means and the output of said adding means connected to its beam intensification means.

Claim 2

Dependent Claim 223 words

In a velocity-and-acceleration analyzing radar including means for displaying the velocity parameter of target-return signals, radar timing means, a velocity-and-acceleration analyzer, a video amplifier and a threshold circuit, means for displaying the doppler frequency spectrum of a selected signal comprising: velocity strobe means triggered by the radar timing means output signal for producing a pulse output which is adjustable as to time of occurrence with respect to the trigger pulse, the stobe pulse also being fed to said means for displaying the velocity parameter so that a particular target may be selected by adjusting the position of the pulse indication to coincide with the target-return indication; means for generating a high-speed sweep signal, said sweep means being connected to be triggered by the output from said velocity strobe means; adding means for adding its input signals, said adding means being connected to receive as input signals the thresholded video signal output of said threshold means and the strobe pulse from said velocity strobe means; and cathode ray tube means (CRT) for displaying the doppler frequency spectrum of said selected target return, said CRT means having the output of said high-speed sweep means connected to its horizontal deflection means, the output of said video amplifier connected to its vertical deflection means and the output of said adding means connected to its beam intensification means.

Claim 3

Dependent Claim 30 words

Apparatus as in claim 1, wherein said velocity strobe means includes means for adjusting both edges of its output pulse in time so that the pulse width may be varied.

Claim 4

Dependent Claim 69 words

Apparatus as in claim 1, further including means for photographing said doppler-frequency-spectrum display comprising: camera means having a biased solenoid and shutter means, said solenoid operating to open said shutter means when energized and to close said shutter means when deenergized, and camera control means connected to receive the velocity strobe pulse as an input for energizing said solenoid during the period of occurrence of said velocity strobe pulse.

Claim 5

Dependent Claim 197 words

Apparatus as in claim 2, wherein said velocity strobe means comprises: first keying means connected to receive the radar timing signal as an input, said keying means acting as an isolating and differentiating circuit; first delay means connected to receive the output of said first keying means as an input for producing a pulse therefrom having an adjustable trailing edge; second keying means connected to receive the output of said first delay means as an input, said keying means acting as an isolating and differentiating circuit; second delay means connected to receive the output of said second keying means as an input, for producing a pulse from the trailing spike of said input whereby both edges of the output of said second delay means are adjustable as to time of occurrence; third keying means connected to receive the output of said second delay means as an input, said keying means acting as an isolating and differentiating circuit; and strobe pulse means connected to receive the output of said third keying means as an input for producing a pulse from the trailing spike thereof, said pulse being adjustable as to time of occurrence and as to pulse width.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-12-16	1978-06-17	1978-12-17	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-12-16	1982-06-17	1982-12-17	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-12-16	1986-06-17	1986-12-17	$7700.00	Window Closed / Lapsed

Frequency spectrum display for radar

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