System and method for passively estimating angle and range of a source using signal samples collected simultaneously from a multi-aperture antenna
First Claim
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1. A system for passively estimating range and angle of a source comprising:
- an antenna to simultaneously receive signals from the source through a plurality of sub-apertures; and
a signal processor to perform a proximity test using samples simultaneously collected from the sub-apertures to determine whether or not to calculate angle and range estimates to the source based on either a curved wavefront assumption or a planar wavefront assumption.
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Abstract
A system and method for passively estimating range and angle of a source are disclosed. The source may be any wave source including radio-frequency (RF), optical, acoustic or seismic sources. In some RF embodiments, the system includes a single aperture antenna to simultaneously receive RF signals from the RF source through a plurality of sub-apertures, and a signal processor to perform a proximity test using samples simultaneously collected from the sub-apertures to determine whether or not to calculate angle and range estimates to the source based on either a curved wavefront assumption or a planar wavefront assumption.
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Citations
32 Claims
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1. A system for passively estimating range and angle of a source comprising:
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an antenna to simultaneously receive signals from the source through a plurality of sub-apertures; and a signal processor to perform a proximity test using samples simultaneously collected from the sub-apertures to determine whether or not to calculate angle and range estimates to the source based on either a curved wavefront assumption or a planar wavefront assumption. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of passively estimating angle and range to a signal source comprising:
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simultaneously receiving signals from the source through a plurality of sub-apertures; and performing a proximity test using samples simultaneously collected from the sub-apertures to determine whether or not to calculate angle and range estimates to the source based on either a curved wavefront assumption or a planar wavefront assumption. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A signal source locator comprising:
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an antenna to simultaneously receive signals from the source through a plurality of sub-apertures; and a signal processor to perform a proximity test using samples simultaneously collected from the sub-apertures to determine whether or not to calculate angle and range estimates to the source based on either a curved wavefront assumption or a planar wavefront assumption, wherein the signal processor calculates both the angle and range estimates to the source using the simultaneously collected samples when the ratio exceeds a predetermined threshold, and wherein the signal processor measures a phase between initially collected samples of the simultaneously received signals generated from each of the sub-apertures. - View Dependent Claims (26, 27, 28)
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29. A machine-accessible medium that provides instructions, which when accessed, cause a machine to perform operations comprising:
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measuring a phase between initially collected samples of simultaneously received signals generated from each of a plurality of sub-apertures; performing a proximity test using the initially collected samples of signals to determine whether or not to calculate angle and range estimates to the source based on either a curved wavefront assumption or a planar wavefront assumption; and calculating both the angle and range estimates to the source using the simultaneously collected samples when the ratio exceeds a predetermined threshold. - View Dependent Claims (30, 31)
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32. A system for passively estimating range and angle of a source comprising:
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an antenna to receive signals from the source through a plurality of sub-apertures; and a signal processor to calculate angle and range estimates to the source based on a curved wavefront assumption using a simultaneously collected single set of samples, wherein the signal processor calculates the angle and range estimates using a least-means-squared solution to a Fresnel approximation, and wherein the antenna has an aperture comprising at least three sub-apertures, each sub-aperture comprising one or more array elements, wherein a spacing between the array elements and a location of the elements are used by the signal processor to calculate both the angle and range estimates to the source.
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Specification