US3740749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Increased field of view detector array
Assignee: Bendix Corp
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Filing: 1971-02-22
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Granted: 1973-06-19
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Expires: 1991-02-22
Abstract
Abstract A system for increasing the field of view of an array of detectors is described. The system also unambiguously identifies the location of a target with respect to the array. The increase of the field of view and the unambiguous locating of the target are obtained by oscillating the detector array about an axis which passes through the plane of the detector array. The angle of oscillation is related to the wavelength of the detected radiation and the separation of the detectors so that a target falling within the main lobe or either side lobe is detected and unambiguously located.
Inventors
- 👤 E Marom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:21
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/02; G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
138 words
A system for increasing the angular field of view of an array of radiation detectors systematically arranged and spaced by a distance gamma and for unambiguously determining the presence of targets present on the main lobe and side lobes of the radiation pattern of said array comprising: means for oscillating said array through an angular excursion and at a constant frequency about an axis within the plane of said array and for generating an array oscillating signal indicative of the oscillating frequency and phase of said array; and frequency sensitive means for receiving the output of said array and said array oscillation signal and yielding an indication representative of the lobe, within said radiation pattern, in which said target is located in accordance with the frequency and phase relationship between said array output and said array oscillation signal.
Claim 2
Independent Claim
138 words
A system for increasing the angular field of view of an array of radiation detectors systematically arranged and spaced by a distance gamma and for unambiguously determining the presence of targets present on the main lobe and side lobes of the radiation pattern of said array comprising: means for oscillating said array through an angular excursion and at a constant frequency about an axis within the plane of said array and for generating an array oscillating signal indicative of the oscillating frequency and phase of said array; and frequency sensitive means for receiving the output of said array and said array oscillation signal and yielding an indication representative of the lobe, within said radiation pattern, in which said target is located in accordance with the frequency and phase relationship between said array output and said array oscillation signal.
Claim 3
Dependent Claim
29 words
The system of claim 1 wherein said means for oscillating oscillates said array through an angular excursion functionally determined from said distance gamma and the wavelength of said radiation.
Claim 4
Dependent Claim
41 words
The system of claim 1 wherein said means for oscillating oscillates said array through an angular excursion defined by the function Rho arcs in lambda / gamma where: Rho said excursion lambda the wavelength of said radiation gamma said distance gamma
Claim 5
Dependent Claim
64 words
The system of claim 1 wherein said means for oscillating includes an oscillator generating said oscillating signal at a constant frequency fs and said array output contains an intensity component fluctuating at a frequency 2fs when a target is present on said main lobe and an intensity component fluctuating at a frequency fs when a target is present on one of said side lobes.
Claim 6
Dependent Claim
52 words
The system of claim 4 wherein said means for receiving includes filter means for separating said fs and said 2fs components, and phase determining means for comparing the phase of said fs component with the phase of said array oscillation signal to thereby identify which of said side lobes contains said target.
Claim 7
Dependent Claim
42 words
The system of claim 5 wherein said means for oscillating oscillates said array through an angular excursion defined by the function Rho sin 1 lambda / gamma where: Rho said excursion lambda the wavelength of said radiation gamma the distance gamma .
Claim 8
Dependent Claim
27 words
The system of claim 1 wherein said means for oscillating oscillates said array through an angular excursion equal to one-half the beam width of said main lobe.
Claim 9
Dependent Claim
27 words
The system of claim 5 wherein said means for oscillating oscillates said array through an angular excursion equal to one-half the beam width of said main lobe.
Claim 10
Dependent Claim
24 words
The system of claim 6 wherein said main lobe of said detector array has a width of 2 sin 1 lambda / gamma .
Claim 11
Dependent Claim
19 words
The system of claim 1 wherein said axis of said array is coincident with the centerline of said array.
Claim 12
Dependent Claim
23 words
The system of claim 1 wherein said radiation detectors are photodiodes located at the intersections of the lines of a right angle matrix.
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |