Scan Angle Range in URA scanning radar

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?

[Ahnaf]

Dear sister , I am working on this same issue . Can you please help me with this code ? It is very urgent

Answer 1

[Honglei Chen]

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

[Kaviya Rajendran]

If I have backbaffled as false, I have a symmetric radiation pattern. It also allows me to scan the entire 360 degree range.

However, I am interested in simulating a scanning radar. So when I steer it to 120 degrees azimuth, the 2 main lobes point at 120 degrees azimuth and 60 degrees azimuth each, due to the symmetry. This prevents me from scanning only one direction at a time. I only want the reflected signal from 120 degrees azimuth, but reflections from targets/clutter at 60 degrees affect the reflected signal.

Is there any way to scan only one direction at a time?

[Honglei Chen]

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