Please help with question #4 below. 1.For a mechanically scanned antenna having

Question

Please help with question #4 below.

1.For a mechanically scanned antenna having an azimuth beamwidth of 2 degrees and an elevation beamwidth of 3 degrees, how many beam positions are required to search a volume defined by a 90 degree azimuth sector and a 6 degree elevation sector?

4. For a phased array antenna, suppose the beamwidth at array normal is 2 degrees by 3 degrees (same as in problem 1). Also suppose that the dwell time used for scan angles between 0 and ± 30 degree is 4 msec, while for scan angles between ± 30 and ± 45 degrees it is 6 msec. If the beam position is stepped in equal step sizes, what is the total search frame time? Assume it takes negligible time to move from one position to the next.

Explanation / Answer

1. N = ? / ? ? = ( 90 x 6 degree2) / (2 degrees) (3 degrees) = 90 beam positions

4.

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