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US4231533A
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Static self-contained laser seeker system for active missile guidance
Assignee: United States Department of the Air Force
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Filing: 1975-07-09
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Granted: 1980-11-04
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Expires: 1995-07-09
Abstract
Abstract Four pulse-repetition-frequency coded laser diode arrays emit four beams in quadrature relationship having a central optical axis coinciding with the missile axis. The returned reflected energy from a target impinges upon an optically centered holographic quadrant selector detection system which provides quadrature output signals. These quadrature output signals are passed through respective pulse-repetition-frequency discriminators corresponding to the quadrature prf coded transmitted beams. The outputs from the discriminators are processed through a null comparison circuit to provide output signals for actuating the servo guidance system of the missile to center the optical axis, which is also the missile axis, on the target so that the missile continuously seeks and eventually flies into the target.
Inventors
- 👤 Richard F. Durig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:04
CPC Classifications
F; F41; F41G; F41G7/00; F41G7/20; F41G7/22; F41G7/2246; F41G7/2273; F41G7/2293; G; G01; G01S; G01S17/00; G01S17/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A static target seeker system for providing active missile guidance signals comprising: a. a first laser diode array emitting an optical beam modulated by a first pulse repetition frequency; b. a second laser diode array emitting an optical beam modulated by a second pulse repetition frequency; c. a third laser diode array emitting an optical beam modulated by a third pulse repetition frequency; d. a fourth laser diode array emitting an optical beam modulated by a fourth pulse repetition frequency; e. means for placing the said four optical beams in respective quadrature relationship about an optical axis; f. a holographic quadrant selector lens plate positioned on the said optical axis, the said lens having a quadrature focal point for each quadrant; g. a diode detector positioned at each said focal point; h. a discriminator associated with each diode, each discriminator providing an output substantially responsive only to signals from the respective corresponding emitting array; and i. a null comparison circuit receiving the outputs from the said discriminators and providing target guidance signals to the said missile.
Claim 2
Dependent Claim
176 words
A static target seeker system for providing active missile guidance signals comprising: a. a first laser diode array emitting an optical beam modulated by a first pulse repetition frequency; b. a second laser diode array emitting an optical beam modulated by a second pulse repetition frequency; c. a third laser diode array emitting an optical beam modulated by a third pulse repetition frequency; d. a fourth laser diode array emitting an optical beam modulated by a fourth pulse repetition frequency; e. means for placing the said four optical beams in respective quadrature relationship about an optical axis; f. a holographic quadrant selector lens plate positioned on the said optical axis, the said lens having a quadrature focal point for each quadrant; g. a diode detector positioned at each said focal point; h. a discriminator associated with each diode, each discriminator providing an output substantially responsive only to signals from the respective corresponding emitting array; and i. a null comparison circuit receiving the outputs from the said discriminators and providing target guidance signals to the said missile.
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) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |