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# Hey can somebody help me wid this problem

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# Hey can somebody help me wid this problem

6th Aug 2012, 09:37

Join Date: Aug 2012
Location: Mumbai
Age: 33
Posts: 2
Hey can somebody help me wid this problem

A radar antenna rotates at 15rpm.pulse width of 2us,beam width of 3deg. Two aircraft are flying towards the antenna at the same speed and initial range,but separated laterally by 1nm. At what range from the antenna will the radar first be able to distinguish between the two aircraft??
7th Aug 2012, 11:10

Join Date: Jul 2010
Location: LHR
Posts: 187
Sure, it's "with", th th th

But I'm sure you knew that

As for your actual question I'm afraid I haven't a clue.

Last edited by HPbleed; 7th Aug 2012 at 11:11.
7th Aug 2012, 11:18

Join Date: Jul 2010
Location: LHR
Posts: 187
Ok, so after that scathing remark I thought I better help:

Maybe this link will help, I'm not sure which formula best fits your model (ie 1 mile behind each other or 1 mile next to each other)

8th Aug 2012, 02:37

Join Date: Dec 2004
Location: N22 E114
Posts: 175
Beam Width 3 degrees.
Aircraft 1 nm apart.
Aircraft must not both be in the beam at the same time to appear as seperate targets.
So 1 in 60 rule:
3 degrees equals 1 NM at 20 NM
So targets must be 20 NM or less to appear as seperate targets to the radar.
8th Aug 2012, 18:02

Join Date: Aug 2012
Location: Mumbai
Age: 33
Posts: 2
Hey..

Thank you for your responses...appreciate it.

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