Patent US4541591A successfully refreshed from Google Patents.
← Back to Patent Explorer
US4541591A Expired / Lapsed US ⏱️ 0.0 years remaining

Guidance law to improve the accuracy of tactical missiles

Assignee: United States Department of the Navy
•
Filing: 1983-04-01
•
Granted: 1985-09-17
•
Expires: 2003-04-01
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A missile guidance system in a canard controlled airframe with means to mure the angle of attack as well as the pursuit angle by the use of a two degree of freedom roll-free reference gyroscope or other inertial reference device so as to move the canard control surfaces, where the canards direct the missile to the target.

Inventors

  • 👤 William R. Chadwick
  • 👤 Conrad M. Rose

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 21:00
CPC Classifications
F; F41; F41G; F41G7/00; F41G7/34; F41G7/36; F41G7/20; F41G7/22; F41G7/226; F41G7/2273; F41G7/2293

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 210 words
A missile guidance system for controlling a missile with canards to strike a target comprising: a missile longitudinal body axis; an inertial-space-fixed reference line; an angle, eta (η) defined as an angle between the inertial-space-fixed reference line and the missile longitudinal body axis; means to measure the angle eta (η) a missile velocity-vector representing the direction of the velocity of the missile; a missile angle of attack alpha (α) defined as an angle between the missile velocity vector and the missile longitudinal body axis; means for measuring the missile angle of attack (α); a missile flight path angle gamma (γ); means to subtract angle eta (η) and angle alpha (α) to form the missile flight path angle gamma (γ); a missile to target line-of-sight; means to measure a pursuit angle epsilon (ξ); defined as the angle between the missile to target line-of-sight and the missile velocity vector; means to form a weighted linear combination R of angle epsilon (ξ) and angle gamma (γ); a control means that functions to automatically move the canards to direct the missile to the target according to the weighted linear combination of epsilon (ξ) and gamma (γ); and means to feed the weighted linear combination of epsilon (ξ) and gamma (γ) to the control means.
Claim 2
Dependent Claim 210 words
A missile guidance system for controlling a missile with canards to strike a target comprising: a missile longitudinal body axis; an inertial-space-fixed reference line; an angle, eta (η) defined as an angle between the inertial-space-fixed reference line and the missile longitudinal body axis; means to measure the angle eta (η) a missile velocity-vector representing the direction of the velocity of the missile; a missile angle of attack alpha (α) defined as an angle between the missile velocity vector and the missile longitudinal body axis; means for measuring the missile angle of attack (α); a missile flight path angle gamma (γ); means to subtract angle eta (η) and angle alpha (α) to form the missile flight path angle gamma (γ); a missile to target line-of-sight; means to measure a pursuit angle epsilon (ξ); defined as the angle between the missile to target line-of-sight and the missile velocity vector; means to form a weighted linear combination R of angle epsilon (ξ) and angle gamma (γ); a control means that functions to automatically move the canards to direct the missile to the target according to the weighted linear combination of epsilon (ξ) and gamma (γ); and means to feed the weighted linear combination of epsilon (ξ) and gamma (γ) to the control means.
Claim 3
Dependent Claim 31 words
The missile guidance system of claim 1 where the means to measure the angle between an inertial-space-fixed reference line and the missile longitudinal body axis is a two-degree-of-freedom roll-free reference gyroscope.
Claim 4
Dependent Claim 35 words
The missile guidance system of claim 1 where the means of measuring the missile angle of attack is by electrical potentionmeters attached to a hooks joint pivot means on a velocity-vane or weathercock stablized seeker.
Claim 5
Dependent Claim 34 words
The missile guidance system of claim 1 where the means of combining the angle between the inertial-space-fixed reference line and the missile longitudinal body axis with the missile angle of attack is computer means.
Claim 6
Dependent Claim 26 words
The missile guidance system of claim 1 where the means to form the weighted linear combination of the pursuit and flight path angles is computer means.
Claim 7
Dependent Claim 23 words
The missile guidance system of claim 1 wherein a means to form a control input to the control means is a computer means.
Claim 8
Dependent Claim 17 words
The missile guidance system of claim 1 where the means to move the canards is a servomechanism.
Claim 9
Dependent Claim 27 words
The missile guidance system of claim 1 where the means to measure the pursuit angle is an infrared detector mounted in a velocity-vane or weathercock stabilized seeker.
Claim 10
Dependent Claim 44 words
A missle guidance system as described in claim 1 wherein said means to form a weighted linear combination of epsilon (ξ) and gamma (γ) includes means for weighting in accordance with the following equation: R=k p (ξ+μγ), where μ and k p are constants.
Claim 11
Dependent Claim 44 words
A missle guidance system as described in claim 5 wherein said means to form a weighted linear combination of epsilon (ξ) and gamma (γ) includes means for weighting in accordance with the following equation: R=k p (ξ+μγ), where μ and k p are constants.

References Cited (Backward Citations)

US3206143A Cited
US4264907A Cited
US3905563A Cited
US4231533A Cited
US4189116A Cited
US4288050A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-09-16 1989-03-18 1989-09-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-09-16 1993-03-18 1993-09-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-09-16 1997-03-18 1997-09-17 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag