Scan Angle Range in URA scanning radar
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My question is regarding the URA scanning radar. The example in the MathWorks website demonstrates scanning from -45 degrees to 45 degrees in Azimuth. I want to scan -180 degrees to 180 degrees in Azimuth.
I am using a 30-by-30 URA, with isotropic antennas as the elements. fc = 10e9. URA.BackBaffled = true.
However, the main lobe (in the radiation pattern) does not go beyond the range -90 degrees to 90 degrees. For example, if the steering angle is [100;0], the main lobe points at the direction 80 degrees Azimuth (instead of 100). For [120;0], the main lobe points at 60 degrees Azimuth (instead of 120) and so on.
Why is this so?
1 Comment
Ahnaf
on 4 Jun 2023
Dear sister , I am working on this same issue . Can you please help me with this code ? It is very urgent
Answers (1)
Honglei Chen
on 26 Jan 2017
This is because you have backbaffled as true, so essentially your elements has no response toward regions beyond -90 to 90. However, the symmetry of a URA makes the directions that are symmetric about the array plane non-distinguishable to the array. Thus, when you steer it to 100 degrees, even though it cannot see anything from 100 degrees, it does see signals coming from 80 degrees, thus the beam behavior.
HTH
2 Comments
Honglei Chen
on 27 Jan 2017
Edited: Honglei Chen
on 27 Jan 2017
Not really if you want to use isotropic elements as the dual lobes you see is determined by the symmetry of the array itself. I believe most arrays in practice use elements with a much suppressed backlobe so technically it only looks at one side of the array. To cover the entire azimuth, you can either rotate the panel, or say use two panels facing each sides.
HTH
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