US3594796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distance measuring
Assignee: International Standard Electric Corp
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Filing: 1969-05-12
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Granted: 1971-07-20
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Expires: 1989-05-12
Abstract
Abstract A pair of horizontally radiating vertically spaced antennas, A and B, radiate frequencies f and f+ delta f, respectively, from a first vehicle. On a second vehicle there is provided a receiver which is coupled to a pair of similarly mounted antennas, A1 and B1. Each antenna, A1 and B1, receives f and f+ delta f. Said receiver determines the phase difference between the best frequencies corresponding to f and f+ delta f at each antenna, A1 and B1, and determines therefrom the distance from said second vehicle to said first vehicle.
Inventors
- 👤 Charles W Earp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:55
CPC Classifications
G; G01; G01S; G01S11/00; G01S11/02; G01S13/00; G01S13/88; G01S13/93; G01S13/933
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
58 words
A receiver for measuring the distance to a pair of spaced transmitters which respectively radiate frequencies f and f+ delta f comprising: a pair of spaced antennas; means coupled to each antenna for deriving the beat frequencies between f and f+ delta f at each antenna; and means for determining the phase difference between said beat frequency signals.
Claim 2
Dependent Claim
58 words
A receiver for measuring the distance to a pair of spaced transmitters which respectively radiate frequencies f and f+ delta f comprising: a pair of spaced antennas; means coupled to each antenna for deriving the beat frequencies between f and f+ delta f at each antenna; and means for determining the phase difference between said beat frequency signals.
Claim 3
Dependent Claim
15 words
A receiver, according to claim 1, wherein said pair of spaced antennas are vertically arranged.
Claim 4
Dependent Claim
67 words
A receiver, according to claim 1, wherein said means for deriving the beat frequency between f and f+ delta f at each antenna includes a first and second detector each of which is coupled to one of said antennas; an RF oscillator coupled to said first and second detectors, and first and second means for extracting beat frequency signals respectively coupled to said first and second detectors.
Claim 5
Dependent Claim
70 words
A receiver, according to claim 1, wherein said means for determining the phase difference between said beat frequency signals includes a first and second limiter; first and second differentiators coupled to said first and second limiters respectively; a bistable multivibrator coupled to said first and second differentiators; and a DC filter coupled to said bistable multivibrator whose output is a measure of the phase difference between said beat frequency signals.
Claim 6
Dependent Claim
24 words
A receiver, according to claim 1, further including a transmitter coupled to said pair of spaced antennas for radiating respectivelY first and second frequencies.
Claim 7
Dependent Claim
21 words
A receiver, according to claim 5, wherein said first and second frequencies are a function of the altitude of the receiver.
Claim 8
Dependent Claim
26 words
A receiver, according to claim 5, wherein said first and second frequencies are radiated only when frequencies f and f+ delta f are not being received.
References Cited (Backward Citations)
US3337872A
Cited
US3366975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |