RK Bali, Air Navigation
RADAR, DME, GNSS: DGCA Air Navigation questions
Radar finds range by timing a pulse there and back. Primary radar uses the echo itself; secondary radar and DME use a transponder's reply. Pulse recurrence frequency, pulse width and beam width set maximum range, minimum range and how well two targets separate.
Expect arithmetic in these 64 questions: range from echo time or PRF, resolution from pulse width, and weather radar tilt sums for cloud tops, then DME slant range, saturation and identification. Exam sessions have asked 5 of them.
One nautical mile of range takes about 12.36 microseconds for the round trip. Subtract a DME beacon's fixed 50 microsecond delay first. Overhead a station, DME reads roughly your height above it in nautical miles.
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Question 1 of 5
The time between transmission and reception of a single pulse is 300 microseconds. Determine the range of the target.
Question 2 of 5
Ignoring pulse width and fly back, calculate the maximum range in nautical miles for a primary radar having a PRF of 500 pulses per second.
Question 3 of 5
Ignoring pulse width and fly back, calculate the maximum permissible PRF for a primary radar which is required to give a range of 200 nm.
Question 4 of 5
The maximum range of a pulsed radar is governed by which parameter?
Question 5 of 5
Ignoring fly back, the maximum theoretical range of a primary radar with a PRF of 800 pps is:
59 more questions in this chapter
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