System and method for determining a position of an object using output from a radar system
First Claim
1. A method of determining a position of an object using output from a radar system mounted on a body, comprising:
- (a) inputting a velocity vector of said body;
(b) inputting a summation output associated with said object from said radar system;
(c) inputting one of an azimuth difference and an elevation difference associated with said object from said radar system;
(d) converting said velocity vector into a parameter representing a relationship between said body and said object; and
(e) determining a position of said object from said summation output, said input one of said azimuth difference and said elevation difference, and said parameter.
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Accused Products
Abstract
An inertial navigation system (INS) and a monopulse radar system are mounted on a body. The inertial navigation system outputs at least a velocity of the body. Either a synthetic aperture radar (SAR) map or doppler beam sharpening (DBS) map is created using the outputs of the monopulse radar system. The monopulse radar system outputs at least a summation output, an azimuth difference and an elevation difference associated with an object detected in either the SAR or DBS map. The position processor of the system and method of the present invention, however, only inputs the summation output and one of the azimuth difference and election difference. The position processor determines the other of the azimuth difference and the elevation difference by converting the velocity output by the INS into a doppler angle θ (the angle between the velocity, a vector, and a line connecting the object and the body) and determining either the azimuth difference or the elevation difference from the doppler angle θ. In this manner, the present invention reduces the number of channels between the monopulse radar system and the position processor. This results in a weight, hardware, and cost savings without a corresponding reduction in performance.
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Citations
38 Claims
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1. A method of determining a position of an object using output from a radar system mounted on a body, comprising:
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(a) inputting a velocity vector of said body; (b) inputting a summation output associated with said object from said radar system; (c) inputting one of an azimuth difference and an elevation difference associated with said object from said radar system; (d) converting said velocity vector into a parameter representing a relationship between said body and said object; and (e) determining a position of said object from said summation output, said input one of said azimuth difference and said elevation difference, and said parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of determining a position of an object using output from a radar system mounted on a body, comprising:
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(a) inputting a velocity vector of said body from an inertial navigation system; (b) inputting a summation output associated with said object from said radar system; (c) inputting one of an azimuth difference and an elevation difference associated with said object from said radar system; (d) calculating one of said azimuth difference and said elevation difference not input by said step (c) based on a doppler frequency of a range-doppler cell containing said object; and (e) determining a position of said object from said summation output, said input one of said azimuth difference and said elevation difference, and said calculated one of said azimuth difference and said elevation difference.
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13. An article of manufacture comprising:
a computer usable medium having a computer readable program code means embodied therein for causing a computer to determine a position of an object using output from a radar system mounted on a body, the computer readable program code means including, first input code means for causing said computer to input a velocity vector of said body; second input code means for causing said computer to input a summation output associated with said object from said radar system; third input code means for causing said computer to input one of an azimuth difference and an elevation difference associated with said object from said radar system; converting code means for causing said computer to convert said velocity vector into a parameter representing a relationship between said body and said object; and determining code means for causing said computer to determine said position of said object from said summation output, said input one of said azimuth difference and said elevation difference, and said parameter. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus for determining a position of an object using output from a radar system mounted on a body, comprising:
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converting means for inputting a velocity vector of said body, and for converting said velocity vector into a parameter representing a relationship between said body and said object; and determining means for inputting a summation output associated with said object from said radar system, for inputting one of an azimuth difference and an elevation difference associated with said object from said radar system, and for determining a position of said object from said summation output, said input one of said azimuth difference and said elevation difference, and said parameter. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An apparatus for determining a position of an object using output from a radar system mounted on a body, comprising:
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converting means for inputting a velocity vector of said body, for inputting a summation output associated with said object from said radar system, for inputting one of an azimuth difference and an elevation difference associated with said object from said radar system, and for converting said velocity vector into one of said azimuth difference and said elevation difference not input based on a doppler frequency of a range-doppler cell containing said object; and determining means for determining a position of said object from said summation output, said input one of said azimuth difference and said elevation difference, and said one of said azimuth difference and said elevation difference converted from said velocity vector.
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33. An system for determining a target position, comprising:
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a radar system mounted on a body which produces a summation output, an elevation difference and an azimuth difference corresponding to an object; converting means for inputting a velocity vector of said body, and for converting said velocity vector into a parameter representing a relationship between said body and said object; determining means for inputting said summation output from said radar system, for inputting one of said azimuth difference and said elevation difference from said radar system, and for determining a position of said object from said summation output, said input one of said azimuth difference and said elevation difference, and said parameter. - View Dependent Claims (34, 35, 36, 37, 38)
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Specification