Radar Question ATPL
Thread Starter
Join Date: Nov 2006
Location: Washington
Posts: 32
Likes: 0
Received 0 Likes
on
0 Posts
Radar Question ATPL
Hi,
Need help solving this problem.
Q. A radar antenna rotates at 15rpm. It has a pulse width of 2 microseconds, and a beam width of 3 degrees. 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?
Possible answer choices:
a) 15nm
b) 20nm
c) 30nm
d) 45nm
Thanks....
Need help solving this problem.
Q. A radar antenna rotates at 15rpm. It has a pulse width of 2 microseconds, and a beam width of 3 degrees. 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?
Possible answer choices:
a) 15nm
b) 20nm
c) 30nm
d) 45nm
Thanks....
Join Date: Jul 2007
Location: Scotland
Age: 64
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
A radar antenna rotates at 15rpm. It has a beam width of 3 degrees. Two aircraft are flying towards the antenna at the same speed and initial range, but separated laterally by 1nm.
So: The radar will be able to differentiate between two targets when they are a beamwidth apart (or greater). The aircraft are seperated 1nm and the beamwidth is 3 degrees, according to the 1:60 rule above that will be when they are nearer than 20nm.
Or am I being too simple?
Capt iS..