US3663734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simulated aircraft radio aids
Assignee: Link Flight Simulation Corp
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Filing: 1970-03-27
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Granted: 1972-05-16
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Expires: 1990-03-27
Abstract
Abstract A system for deriving electrical signals to operate simulated radio and navigation equipment in a fixed-base aircraft trainer in accordance with assumed fixed data and variable flight information. Data associated with the transmitting stations is programmed on punched cards which are inserted in a static card reader and supplied in digital form to other components for operations combining or comparing such data with digital flight data. Signals representing the difference between station and aircraft reference coordinates are provided in digital form, as opposed to the analog signals in all prior forms of such apparatus. These digital signals are then applied to a D/A converter, along with other digital signals representing other navigational information, and commensurate analog voltages are produced and sampled at appropriate times to provide signals for computation in the aircraft trainer radio aids analog computer. The D/A converter is time-shared so that it provides, in addition to the aforementioned analog outputs, a ramp voltage generated in response to an input from a free running digital counter.
Inventors
- 👤 Robert W Howland
- 👤 Richard L Van Fleet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:44
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
190 words
A system for simulating aircraft radio navigation equipment in a fixed-base aircraft trainer wherein the simulated aircraft parameters are computed by an analog computer, said system comprising, in combination: a. first means for representing digitally the simulated location, in terms of assumed reference coordinates, and the frequency of a transmitting station; b. second means for representing digitally the simulated location, in terms of said reference coordinates, of said trainer; c. third means responsive to the setting of a simulated tuning dial for representing digitally the frequency to which said tuning dial has been set. d. a binary subtractor adapted to receive digital inputs from said first and second means and generate a digital output representing the difference between the simulated location of said station and said aircraft; e. a digital-to-analog converter for converting said digital output to analog voltages commensurate with said difference in location; f. means for comparing said digital representation of said transmitting station simulated frequency with said digital representation of said tuning dial setting; and g. means responsive to said comparing means for validating the output of said binary subtractor only when said frequencies are the same.
Claim 2
Independent Claim
190 words
A system for simulating aircraft radio navigation equipment in a fixed-base aircraft trainer wherein the simulated aircraft parameters are computed by an analog computer, said system comprising, in combination: a. first means for representing digitally the simulated location, in terms of assumed reference coordinates, and the frequency of a transmitting station; b. second means for representing digitally the simulated location, in terms of said reference coordinates, of said trainer; c. third means responsive to the setting of a simulated tuning dial for representing digitally the frequency to which said tuning dial has been set. d. a binary subtractor adapted to receive digital inputs from said first and second means and generate a digital output representing the difference between the simulated location of said station and said aircraft; e. a digital-to-analog converter for converting said digital output to analog voltages commensurate with said difference in location; f. means for comparing said digital representation of said transmitting station simulated frequency with said digital representation of said tuning dial setting; and g. means responsive to said comparing means for validating the output of said binary subtractor only when said frequencies are the same.
Claim 3
Dependent Claim
29 words
The invention according to claim 1 wherein said first means comprises a static card reader having an output commensurate with data programmed on punched cards inserted in said reader.
Claim 4
Dependent Claim
53 words
The invention according to claim 1 wherein signals commensurate with the frequency to which the simulated VOR tuning dial has been set are directly represented digitally, and an analog signal commensurate with the frequency to which the simulated ADF tuning dial has been set is converted to digital form by analog-to-digital converting means.
Claim 5
Dependent Claim
69 words
The invention according to claim 3 wherein the value of said analog signal is compared with a ramp voltage generated by said digital-to-analog converter in response to an input from a digital master logic counter, and the digital value necessary to produce the ramp voltage value which is equal to said analog signal is compared with the digital value of the simulated ADF frequency programmed on said punched cards.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |