US3781880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Area navigation system
Assignee: Honeywell Inc
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Filing: 1971-04-05
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Granted: 1973-12-25
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Expires: 1991-04-05
Abstract
Abstract An apparatus permitting area navigation employs radio distance measuring equipment transmissions and omni-range radio transmissions from a guidance transmitter system for craft-borne employment of magnetic azimuth and actual ground range of the craft with respect to the guidance transmitter location.
Inventors
- 👤 R Jacobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:44
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/38
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
164 words
Area navigation apparatus responsive to fixed navigation transmitter means supplying omni-range and distance meansurement radiations, comprising: craft-borne omni-range receiver means responsive to said omnirange radiations, craft-borne radio distance measurement receiver means responsive to said distance measurement radiations, rectifier means responsive to said omni-range receiver means, multiplier means responsive to said rectifier means and to said radio distance measurement receiver means for producing an output signal substantially proportional to ground range with respect to said navigation transmitter means, and means for utilizing said output signal substantially proportional to said ground range, said omni-range receiver means including: receiver circuit means for providing a first audio outpuT having a first characteristic phase, frequency discriminator means coupled to said receiver circuit means for providing a second audio output having a second characteristic phase, first and second band pass filter means respectively responsive to said first and second audio outputs, and switch means for selectively coupling said first or said second band pass filter means to said rectifier means.
Claim 2
Dependent Claim
164 words
Area navigation apparatus responsive to fixed navigation transmitter means supplying omni-range and distance meansurement radiations, comprising: craft-borne omni-range receiver means responsive to said omnirange radiations, craft-borne radio distance measurement receiver means responsive to said distance measurement radiations, rectifier means responsive to said omni-range receiver means, multiplier means responsive to said rectifier means and to said radio distance measurement receiver means for producing an output signal substantially proportional to ground range with respect to said navigation transmitter means, and means for utilizing said output signal substantially proportional to said ground range, said omni-range receiver means including: receiver circuit means for providing a first audio outpuT having a first characteristic phase, frequency discriminator means coupled to said receiver circuit means for providing a second audio output having a second characteristic phase, first and second band pass filter means respectively responsive to said first and second audio outputs, and switch means for selectively coupling said first or said second band pass filter means to said rectifier means.
Claim 3
Dependent Claim
45 words
Apparatus as described in claim 1 further including: intermediate amplifier means within said receiver circuit means, side band filter means responsive to said intermediate amplifier means, and detector circuit means responsive to said side band filter means for controlling the conductivity of said switch means.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |