Monopulse radar signal processing for rotorcraft brownout aid application
First Claim
1. A method of reducing range and angular ambiguities in a target data matrix output from a real beam monopulse radar sensor within a single beam for use in terrain morphing applications employed by brownout take-off and landing aid systems, comprising the steps of:
- calculating one or more range bins disposed at a ground interception point and between at least one near and far boundary points of an antenna elevation beam to selectively determine one or more range segments from one or more targets of interest;
adaptively applying range resolution enhancement processing to said selectively determined one or more range segments to obtain a range of target scatter locations;
estimating a monopulse angle bin from said obtained range of target scatter locations and one or more control inputs;
adaptively applying elevation and azimuth angular binning to said estimated monopulse angle bin to obtain a smaller coverage area among one or more possible target areas;
selecting one or more shortest-range bins in a two-dimensional (2D) azimuth and elevation grid from said smaller coverage area; and
generating said target data output matrix from said selected one or more shortest-range bins in said two-dimensional (2D) azimuth and elevation grid.
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Accused Products
Abstract
A method, system and computer program is disclosed for reducing range and angular ambiguities in a target data matrix output from a real beam monopulse radar sensor within a single beam for use in terrain morphing applications employed by brownout take-off and landing aid systems. One or more range bins are calculated to selectively determine one or more range segments from one or more targets of interest. Range resolution enhancement processing is employed to the selectively determined one or more range segments to obtain a range of target scatter locations. A monopulse angle bin is estimated from the obtained range of target scatter locations and one or more control inputs. Elevation and azimuth angular binning is applied to the estimated monopulse angle bin to obtain a smaller coverage area among one or more possible target areas. One or more shortest-range bins in a two-dimensional (2D) azimuth and elevation grid is selected from the smaller coverage area, which generate the target data output matrix from the selected one or more shortest-range bins in the two-dimensional (2D) azimuth and elevation grid.
34 Citations
29 Claims
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1. A method of reducing range and angular ambiguities in a target data matrix output from a real beam monopulse radar sensor within a single beam for use in terrain morphing applications employed by brownout take-off and landing aid systems, comprising the steps of:
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calculating one or more range bins disposed at a ground interception point and between at least one near and far boundary points of an antenna elevation beam to selectively determine one or more range segments from one or more targets of interest; adaptively applying range resolution enhancement processing to said selectively determined one or more range segments to obtain a range of target scatter locations; estimating a monopulse angle bin from said obtained range of target scatter locations and one or more control inputs; adaptively applying elevation and azimuth angular binning to said estimated monopulse angle bin to obtain a smaller coverage area among one or more possible target areas; selecting one or more shortest-range bins in a two-dimensional (2D) azimuth and elevation grid from said smaller coverage area; and generating said target data output matrix from said selected one or more shortest-range bins in said two-dimensional (2D) azimuth and elevation grid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for generating a target data matrix providing a reduction in range and angular ambiguities output from a real beam monopulse radar sensor within a single beam for use in terrain morphing applications employed by brownout take-off and landing aid systems, comprising:
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means for calculating one or more range bins disposed at a ground interception point and between at least one near and far boundary point of an antenna elevation beam to selectively determine one or more range segments from one or more targets of interest; means for adaptively applying range super resolution processing to said selectively determined one or more range segments to obtain a range of target scatter locations; means for estimating a monopulse angle bin from said obtained range of target scatter locations and one or more control inputs; means for adaptively applying elevation and azimuth angular binning to said estimated monopulse angle bin to obtain a smaller coverage area among one or more possible target areas; means for selecting one or more shortest-range bins in a two-dimensional (2D) azimuth and elevation grid from said smaller coverage area; and means for generating said target data output matrix from said selected one or more shortest-range bins in said two-dimensional (2D) azimuth and elevation grid. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A program storage device readable by a machine, tangibly embodying a program of instructions executable by the machine to perform a method of reducing range and angular ambiguities in a target data matrix output from a real beam monopulse radar sensor within a single beam for use in terrain morphing applications employed by brownout take-off and landing aid systems, comprising the steps of:
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calculating one or more range bins disposed at a ground interception point and between at least one near and far boundary point of an antenna elevation beam to selectively determine one or more range segments from one or more targets of interest; adaptively applying range super resolution processing to said selectively determined one or more range segments to obtain a range of target scatter locations; estimating a monopulse angle bin from said obtained range of target scatter locations and one or more control inputs; adaptively applying elevation and azimuth angular binning to said estimated monopulse angle bin to obtain a smaller coverage area among one or more possible target areas; selecting one or more shortest-range bins in a two-dimensional (2D) azimuth and elevation grid from said smaller coverage area; and generating said target data output matrix from said selected one or more shortest-range bins in said two-dimensional (2D) azimuth and elevation grid.
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Specification