Efficient technique for estimating elevation angle when using a broad beam for search in a radar
First Claim
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1. A method for determining target elevation during a radar search comprising:
- determining the range of any target detected during a search with a broad beam covering a broad angular search area;
based on the determined range, transmitting consecutive beams at increasing search elevation angles in the broad angular search area; and
using echo signals of the consecutive beams to determine an elevation angle estimate for the target.
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Abstract
A method and apparatus for estimating elevation angle when using a broad search beam such as a cosecant-squared beam is provided. The range of a target detected during a search with a broad beam covering a broad angular search area is determined. Based on the determined range, consecutive beams are transmitted at increasing search elevation angles in the broad angular search area. Echo signals of the consecutive beams are used to determine an elevation angle estimate for the target.
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Citations
57 Claims
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1. A method for determining target elevation during a radar search comprising:
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determining the range of any target detected during a search with a broad beam covering a broad angular search area; based on the determined range, transmitting consecutive beams at increasing search elevation angles in the broad angular search area; and using echo signals of the consecutive beams to determine an elevation angle estimate for the target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for determining target location during a radar search comprising:
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determining the range of any target detected during a search with a broad beam covering a broad angular search area; based on the determined range, transmitting consecutive beams at increasing search elevation angles in the broad angular search area; and using echo signals of the consecutive beams to determine at least one angle estimate for the target. - View Dependent Claims (30)
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31. A radar system comprising:
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means for determining the range of any target detected during a search with a broad beam covering a broad angular search area; means for transmitting consecutive beams at increasing search elevation angles in the broad angular search area for the determined range; and means for using echo signals of the consecutive beams to determine an elevation angle estimate for the target.
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32. A radar system comprising:
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an antenna system; a transmitter coupled to the antenna system; a receiver coupled to the antenna system; a controller to control the transmitter, receiver and antenna system; wherein the receiver, responsive to control signals from the controller, operates to determine the range of any target detected during a search with a broad beam covering a broad angular search area; wherein the transmitter, responsive to signals from the controller, operates to transmit, via the antenna system, consecutive beams at increasing search elevation angles in the broad angular search area for the determined range; and wherein the receiver, responsive to control signals from the controller, operates to use echo signals of the consecutive beams received via the antenna system to determine an elevation angle estimate for the target. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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56. A radar system for determining target location during a radar search comprising:
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means for determining the range of any target detected during a search with a broad beam covering a broad angular search area; means for transmitting consecutive beams at increasing search elevation angles in the broad angular search area based on the determined range; and means for using echo signals of the consecutive beams to determine at least one angle estimate for the target. - View Dependent Claims (57)
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Specification