SYSTEM AND METHOD FOR DETERMINING GEO LOCATION OF A TARGET USING A CONE COORDINATE SYSTEM
First Claim
1. A method performed by one or more processors for determining geo-position of a target by an aircraft, the method comprising:
- receiving navigation data related to the aircraft including aircraft attitude information;
receiving multilateration information related to the target including an angle to the target;
calculating an axis for a cone fixed to the aircraft, based on the received aircraft attitude information;
calculating a central angle for the cone from the received angle to the target;
generating two vectors orthogonal to the cone axis;
calculating a cone model from the axis, the central angle and the two vectors; and
intersecting the cone model with an earth model to obtain a locus of emitter positions (LEP) curve, wherein the LEP curve is used to determine the geo position of the target.
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Abstract
A method for determining geo-position of a target by an aircraft includes: receiving navigation data related to the aircraft including aircraft attitude information; receiving multilateration information related to the target including an angle to the target; calculating an axis for a cone fixed to the aircraft, based on the received aircraft attitude information; calculating a central angle for the cone from the received angle to the target; generating two vectors orthogonal to the cone axis; calculating a cone model from the axis, the central angle and the two vectors; and intersecting the cone model with an earth model to obtain a LEP curve, wherein the LEP curve is used to determine the geo position of the target.
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Citations
17 Claims
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1. A method performed by one or more processors for determining geo-position of a target by an aircraft, the method comprising:
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receiving navigation data related to the aircraft including aircraft attitude information; receiving multilateration information related to the target including an angle to the target; calculating an axis for a cone fixed to the aircraft, based on the received aircraft attitude information; calculating a central angle for the cone from the received angle to the target; generating two vectors orthogonal to the cone axis; calculating a cone model from the axis, the central angle and the two vectors; and intersecting the cone model with an earth model to obtain a locus of emitter positions (LEP) curve, wherein the LEP curve is used to determine the geo position of the target. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for determining geo position of a target by an aircraft comprising:
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a receiver for receiving navigation data related to the aircraft and multilateration information related to the target, wherein the navigation data includes aircraft attitude information and the multilateration information includes an angle to the target; one or more processors for calculating an axis for a cone fixed to the aircraft, based on the received aircraft attitude information, calculating a central angle for the cone from the received angle to the target, generating two vectors orthogonal to the cone axis, calculating a cone model from the axis, the central angle and the two vectors, and intersecting the cone model with an earth model to obtain a locus of emitter positions (LEP) curve, wherein the LEP curve is used to determine the geo position of the target. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method performed by one or more processors for determining geo position of a target by an aircraft, the method comprising:
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(a). receiving navigation data related to the aircraft and multilateration information related to the target; (b). calculating a locus of emitter positions (LEP) curve from the received navigation data and multilateration information using a cone model fixed to the aircraft longitudinal axis and intersecting the cone model with a three-dimensional geometric model of the earth; (c). repeating steps (a) and (b); (d). accumulating, in a computer storage medium, the calculated LEP curves; and (e). electronically determining a position that is closest to all the accumulated LEP curves to establish a position of the target. - View Dependent Claims (14, 15, 16, 17)
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Specification