Method and apparatus for determining the position and velocity of a target in inertial space
First Claim
1. A method for determining the position and velocity of a target in inertial space including the steps of:
- (a) Tracking the target and providing three orthogonal velocity components in inertial space;
(b) computing the scalar velocity VT of the target in an inertial reference frame by providing the square root of the sum of the squares of the orthogonal velocity components;
(c) computing the aspect angle cue of the target relative to a line-of-sight to a platform as an inverse sinusoidal function of the ratio of one of said orthogonal components and VT, when such tracking data is available, and otherwise;
(d) estimating actual target maneuver to develop a minimum uncertainty zone using an assumed worst case lateral target acceleration; and
(e) aiming an antenna at said determined positioned of said target.
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Abstract
A method for determining the position and velocity of a target in inertial space including the steps of (a) tracking the target and providing three orthogonal velocity components in inertial space; (b) computing the scalar velocity VT of the target in an inertial reference frame by providing the square root of the sum of the squares of the orthogonal velocity components; and (c) computing the aspect angle βcue of the target relative to a line-of-sight to a platform as an inverse sinusoidal function of the ratio of one of said orthogonal components and VT, when such tracking data is available, and otherwise; (d) estimating actual target maneuver to develop a minimum uncertainty zone using an assumed worst case lateral target acceleration. Also disclosed are techniques for bounding the aspect angle and for providing global range and range rate estimates which account for uncertainties in the measurements of target and platform ranges and velocities.
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Citations
10 Claims
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1. A method for determining the position and velocity of a target in inertial space including the steps of:
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(a) Tracking the target and providing three orthogonal velocity components in inertial space; (b) computing the scalar velocity VT of the target in an inertial reference frame by providing the square root of the sum of the squares of the orthogonal velocity components; (c) computing the aspect angle cue of the target relative to a line-of-sight to a platform as an inverse sinusoidal function of the ratio of one of said orthogonal components and VT, when such tracking data is available, and otherwise; (d) estimating actual target maneuver to develop a minimum uncertainty zone using an assumed worst case lateral target acceleration; and (e) aiming an antenna at said determined positioned of said target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for determining the position and velocity components in inertial space;
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means for tracking the target and providing three orthogonal velocity components in inertial space; means for computing the scalar velocity VT of the target in an inertial reference frame by providing the square root of the sum of the squares of the orthogonal velocity components; means for computing the aspect angle cue of the target relative to a line-of-sight to a platform as an inverse sinusoidal function of the ratio of one of said orthogonal components and VT, when such tracking data is available, and; means for estimating actual target maneuver to develop a minimum uncertainty zone using an assumed worst case lateral target acceleration when such tracking data is not available; and means for aiming an antenna at said determined position.
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Specification