Method and system for target localization
First Claim
Patent Images
1. A method of estimating a minimum range to a target, comprising:
- a. obtaining at least three bearing data points of the target with respect to an ownship;
b. using the three bearing data points to determine a speed contribution Vos of a first point of interest to a distance from a relative velocity vector over a time frame comprising an initial time t0 to a predetermined time ti;
c. determining an angle θ
β
as defined as the bearing relative to the ownship'"'"'s heading at the point in time of closest approach to a second point of interest; and
d. calculating a minimum range Min RCPA using the formula
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Abstract
The present inventions comprise a method of estimating a minimum range for a target with respect to a first point of interest, independent of actual, range to the target, comprising obtaining three bearing data points; using the three bearing data points to determine a speed contribution Vos of a first point of interest to a distance from a relative velocity vector over a time frame comprising t0 to t0′; determining an angle θβ as defined by the bearing relative to ownship'"'"'s heading at the point in time of closest approach to a second point of interest; and calculating a minimum range using a predetermined formula.
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Citations
13 Claims
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1. A method of estimating a minimum range to a target, comprising:
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a. obtaining at least three bearing data points of the target with respect to an ownship;
b. using the three bearing data points to determine a speed contribution Vos of a first point of interest to a distance from a relative velocity vector over a time frame comprising an initial time t0 to a predetermined time ti;
c. determining an angle θ
β
as defined as the bearing relative to the ownship'"'"'s heading at the point in time of closest approach to a second point of interest; and
d. calculating a minimum range Min RCPA using the formula - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for estimating a minimum range Min RCPA to a contact, independent of actual contact range, comprising:
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a. passively obtaining at least three bearing data points of the contact relative to an ownship;
b. determining an angle θ
β
defining the bearing relative to a heading of the ownship at the point in time of closest approach to a second point of interest;
c. calculating a minimum range at CPA between the ownship and the target using the formula - View Dependent Claims (8, 9, 10, 11)
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12. A system for calculating an estimated minimum range estimate RCPA from a source to a target, comprising:
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a. a bearing detector capable of passively obtaining a bearing to the target from the source;
b. a computer having a processor and memory; and
c. range calculation software executing in the computer;
d. wherein i. the memory stores at least three bearing data points obtained from the bearing detector;
ii. the range calculation software uses the stored three bearing data points to determine a speed contribution Vos of the target to a distance from a relative velocity vector over a time from t0 to t0′
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iii. the range calculation software determines an angle θ
β
defined by the bearing relative to a heading of the source at the point in time of closest approach to the target;
iv. the range calculation software calculates a minimum range from the source to the target as - View Dependent Claims (13)
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Specification