US3573338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fresnel image computer
Assignee: United States Department of the Navy
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Filing: 1965-08-13
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Granted: 1971-04-06
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Expires: 1985-08-13
Abstract
Abstract A TV projection system for simulating on a common projector screen the appearance of an aircraft landing area and an associated Fresnel-type visual landing aid through the use of a TV projector for the landing area image and a beam writing projector for the landing aid image, the system utilizing a flying spot scanner TV image method and containing a transparency representative of the landing area and having a reflective pointer positioned in such a way with respect to the flying spot scanner horizontal and vertical sweep directions so that the point of the pointer is first touched by the flying spot in each frame, an optical pickup above the transparency to pick up reflected video from the arrow so that the first video pulse per frame represents the beam writing pattern center position on the flying spot scanner as well as on the TV projector, a sampling system to sample the TV yoke currents at the first video pulse, and two DC stabilized operational amplifiers, which may include yoke driver output stages, connected in such a way as to produce the desired beam writing pattern in the beam writing projector, properly positioned with respect to the TV projector, when both images are projected on the common screen.
Inventors
- 👤 Dorsey Davidoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:12
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/30; G09B9/301; G09B9/302; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
319 words
In a device for simulating the appearance of an aircraft landing area and an associated Fresnel type visual landing aid, the combination comprising: a first source (16) of signals including a first horizontal signal component and a first vertical signal component, representative of said landing area; a second source (10) of signals including a second horizontal signal component, a second vertical signal component, and a blanking signal component; means (31) for generating landing aid position pulses representative of the position of the landing aid with respect to said landing area; position pulse detection means (24) responsive to said position pulses to provide position signals; a landing aid horizontal position computer (26); a landing aid vertical position computer (28); first and second sampler means (20, 22) responsive to said position signals to sample said first horizontal and first vertical signal components, respectively, and to provide signal voltages corresponding thereto as outputs to said horizontal and vertical position computers, respectively; a Fresnel image control means (30) responsive to said blanking signal component and to an input signal which is an analogue representation of simulated distance from a simulated aircraft to said landing aid to provide size control signals as one output and Fresnel image video signals as another output; first and second size control means (63, 61) connected to receive said second horizontal and second vertical signal components, respectively, and responsive to said size control signals to apply size-corrected horizontal and vertical signal components to said horizontal and vertical position computers, respectively, said position computers being responsive to said signal voltage outputs of said sampler means and to said size corrected signal components to provide Fresnel image horizontal and vertical deflection signals; and a Fresnel color projector connected to receive said Fresnel image video signals and said Fresnel image horizontal and vertical deflection signals and responsive thereto to project an image simulating the appearance of said Fresnel type visual landing aid.
Claim 2
Dependent Claim
319 words
In a device for simulating the appearance of an aircraft landing area and an associated Fresnel type visual landing aid, the combination comprising: a first source (16) of signals including a first horizontal signal component and a first vertical signal component, representative of said landing area; a second source (10) of signals including a second horizontal signal component, a second vertical signal component, and a blanking signal component; means (31) for generating landing aid position pulses representative of the position of the landing aid with respect to said landing area; position pulse detection means (24) responsive to said position pulses to provide position signals; a landing aid horizontal position computer (26); a landing aid vertical position computer (28); first and second sampler means (20, 22) responsive to said position signals to sample said first horizontal and first vertical signal components, respectively, and to provide signal voltages corresponding thereto as outputs to said horizontal and vertical position computers, respectively; a Fresnel image control means (30) responsive to said blanking signal component and to an input signal which is an analogue representation of simulated distance from a simulated aircraft to said landing aid to provide size control signals as one output and Fresnel image video signals as another output; first and second size control means (63, 61) connected to receive said second horizontal and second vertical signal components, respectively, and responsive to said size control signals to apply size-corrected horizontal and vertical signal components to said horizontal and vertical position computers, respectively, said position computers being responsive to said signal voltage outputs of said sampler means and to said size corrected signal components to provide Fresnel image horizontal and vertical deflection signals; and a Fresnel color projector connected to receive said Fresnel image video signals and said Fresnel image horizontal and vertical deflection signals and responsive thereto to project an image simulating the appearance of said Fresnel type visual landing aid.
Claim 3
Dependent Claim
80 words
The combination of claim 1, and wherein said horizontal position computer comprises: DC amplifier means (34) responsive to signal voltages from said first sampler means and to said size-corrected horizontal signal component to provide a horizontal error signal; AC amplifier means (56) responsive to said error signal and said size-corrected horizontal signal component to provide horizontal yoke driver input signals; and yoke driver means (58) responsive to said yoke driver input signals to provide said Fresnel image horizontal deflection signals.
Claim 4
Dependent Claim
80 words
The combination of claim 2, and wherein said vertical position computer comprises: DC amplifier means responsive to signal voltages from said second sampler means and to said size-corrected vertical signal component to provide a vertical error signal; AC amplifier means responsive to said vertical error signal and said size corrected vertical signal component to provide vertical yoke driver input signals; and yOke driver means responsive to said vertical yoke driver input signals to provide said Fresnel image vertical deflection signals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |