US3936829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of radio navigation
Assignee: International Standard Electric Corp
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Filing: 1974-12-05
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Granted: 1976-02-03
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Expires: 1994-12-05
Abstract
Abstract A method of determining, at the site of a radio beacon, the location of any beacon signal reflecting objects, in which method the beacon is caused to transmit a directionally coded signal over a given service sector, in which during said signal transmission a radio receiver is moved towards said beacon along a predetermined path in said sector, in which during said movement all beacon-derived signals received by the receiver are recorded in a form such as to be coded at least in respect of beacon related bearings and in which said recorded signals are individually isolated in such a manner as to permit identification and location of any of said reflecting objects.
Inventors
- 👤 Francis G. Overbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:00
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/38
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A method of determining, at the site of a radio beacon, the location of any beacon signal reflecting objects, in which method the beacon is caused to transmit a directionally coded signal over a given service sector, in which during said signal transmission a radio receiver is moved towards said beacon along a predetermined path in said sector, in which during said movement all beacon-derived signals received by the receiver are recorded in a form such as to be coded at least in respect of beacon related bearings and receiver related bearings, and in which said recorded signals are individually isolated in such a manner as to permit identification and location of any of said reflecting objects.
Claim 2
Independent Claim
117 words
A method of determining, at the site of a radio beacon, the location of any beacon signal reflecting objects, in which method the beacon is caused to transmit a directionally coded signal over a given service sector, in which during said signal transmission a radio receiver is moved towards said beacon along a predetermined path in said sector, in which during said movement all beacon-derived signals received by the receiver are recorded in a form such as to be coded at least in respect of beacon related bearings and receiver related bearings, and in which said recorded signals are individually isolated in such a manner as to permit identification and location of any of said reflecting objects.
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1 in which the transmitted signal is directionally coded in terms of frequency and is transmitted by a Doppler radio beacon.
Claim 4
Dependent Claim
33 words
A method as claimed in claim 2 in which the recorded signals are individually identified in respect of frequency and amplitude from a panoramic display of the recorded signals on a spectrum analyser.
Claim 5
Dependent Claim
40 words
A method as claimed in claim 3 in which the receiver related bearing of an identified reflection signal is derived by measuring the rate of change of differential path length between the identified direct path signal and the reflected signal.
Claim 6
Dependent Claim
53 words
A method as claimed in claim 3 in which, prior to recording the received signals, a swept amplitude modulation pattern is impressed thereon such that on identification of a recorded reflection signal the time of maximum output thereof is indicative of the receiver related bearing of the object reflecting the beacon transmitted signal.
Claim 7
Dependent Claim
69 words
A method as claimed in claim 3 in which, prior to recording the received signals, there is impressed thereon a Doppler frequency shift of a magnitude determined by the angle of reception of a given component of the received signal, and on identification of a recorded reflection signal the receiver Doppler shifted component thereof is indicative of the receiver related bearing of the object reflecting the beacon transmitted signal.
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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |