US4721270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Missile guidance systems
Assignee: MBDA UK Ltd
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Filing: 1986-10-31
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Granted: 1988-01-26
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Expires: 2006-10-31
Abstract
Abstract In automatic command to line of sight guidance systems, the missile and target are tracked remotely and a guidance computer processes the tracking data to provide a guidance command for the missile. In such systems, the target and missile must be visible but when the angular subtense of the missile flare is greater than that of the target, the target is totally obscured by the flare when the missile is on sightline leading to the erroneous guidance commands. Described herein is a system in which the obscuration of the target by the missile flare is reduced by guiding the missile along a trajectory displaced from the sightline until the target subtense is the same size as that of the missile.
Inventors
- 👤 David Salkeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:59
CPC Classifications
F; F41; F41G; F41G7/00; F41G7/20; F41G7/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
140 words
A missile guidance system including missile tracker means for outputting missile directional data representative of the angular direction of said missile and missile subtense data representative of the angular subtense of said missile, target tracker means for outputting target directional data representative of the angular direction of said target and target subtense data representative of the angular subtense of said target, processing means for processing said missile directional data and target directional data to generate a guidance command adapted to maintain said missile on a sightline connecting the target and the tracker, comparator means for comparing said missile subtense data and said target subtense data, and trajectory bias means responsive to the output of said comparator means for applying an offset to said guidance command when the ratio of the missile subtense to the target subtense exceeds a predetermined value.
Claim 2
Dependent Claim
140 words
A missile guidance system including missile tracker means for outputting missile directional data representative of the angular direction of said missile and missile subtense data representative of the angular subtense of said missile, target tracker means for outputting target directional data representative of the angular direction of said target and target subtense data representative of the angular subtense of said target, processing means for processing said missile directional data and target directional data to generate a guidance command adapted to maintain said missile on a sightline connecting the target and the tracker, comparator means for comparing said missile subtense data and said target subtense data, and trajectory bias means responsive to the output of said comparator means for applying an offset to said guidance command when the ratio of the missile subtense to the target subtense exceeds a predetermined value.
Claim 3
Dependent Claim
38 words
A system according to claim 1, wherein the missile is guided along a trajectory displaced relative to the sightline until the target subtense is the same size as that of the missile when said predetermined value is exceeded.
Claim 4
Dependent Claim
27 words
A system according to claim 2, wherein the offset applied causes the missile to follow a trajectory displaced relative to the sightline by a predetermined angular amount.
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) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |