Array modification that adds height capability to a 2D array radar
First Claim
1. A two-dimensional (2D) radar antenna system for forming two beams in different directions to achieve illumination characteristics of both phase angle difference and amplitude difference with respect to a common target for deriving the elevation of said target, said system comprising:
- an array of antenna elements including first and second subarrays of antenna elements, said elements of said first and second subarrays being mutually exclusive;
first and second power divider networks for distributing illuminating power in said first and second subarrays, respectively, to compositely form a first beam, the illuminating power of said formed first beam being concentrated at a location in said first subarray of antenna elements;
a first receiving channel driven commonly by both the first and second power divider networks;
a third power divider network, coupled to said second power divider network, for distributing illuminating power in said second subarray of antenna elements to form a second beam in a direction different from that of said first beam, the illuminating power of said formed second beam being concentrated at a location in said second subarray of antenna elements; and
a second receiving channel driven by the third power divider network.
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Abstract
A two-dimensional (2D) radar antenna system includes a combination of power divider networks coupled together to drive an array of antenna elements to form two beams in different directions spatially. The power divider networks, in combination, have characteristics which effect power concentrations of the two formed beams at different locations in the array without significant loss of illuminating power. As a result, the two formed beams render both amplitude and phase angle difference signals with respect to a common detected target which may be used to accurately and uniquely measure the elevation of the target.
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Citations
10 Claims
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1. A two-dimensional (2D) radar antenna system for forming two beams in different directions to achieve illumination characteristics of both phase angle difference and amplitude difference with respect to a common target for deriving the elevation of said target, said system comprising:
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an array of antenna elements including first and second subarrays of antenna elements, said elements of said first and second subarrays being mutually exclusive; first and second power divider networks for distributing illuminating power in said first and second subarrays, respectively, to compositely form a first beam, the illuminating power of said formed first beam being concentrated at a location in said first subarray of antenna elements; a first receiving channel driven commonly by both the first and second power divider networks; a third power divider network, coupled to said second power divider network, for distributing illuminating power in said second subarray of antenna elements to form a second beam in a direction different from that of said first beam, the illuminating power of said formed second beam being concentrated at a location in said second subarray of antenna elements; and a second receiving channel driven by the third power divider network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification