Oxford, Air Navigation
Radar Principles: DGCA Air Navigation questions
Primary radar sends out a pulse and times its echo. From that follow its maximum and minimum range, how finely it separates two returns, and how it measures bearing.
Echo time and pulse rate drive most of the 14 questions. You convert microseconds to range, link pulse repetition frequency, or PRF, to maximum range, and weigh power, antenna design and Doppler filtering. Exam sessions have taken 5 from this list.
The echo makes a round trip, so halve the travel time before turning it into distance. One radar nautical mile takes about 12.36 microseconds there and back. PRF is pulses per second, and the pulse interval is its reciprocal, so keep seconds and microseconds straight.
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Question 1 of 5
The factor which determines the maximum range of a radar is:
Question 2 of 5
The main advantage of continuous wave radars is:
Question 3 of 5
If the PRF of a primary radar is 500 pulses per second, the maximum range will be:
Question 4 of 5
To double the range of a primary radar would require the power to be increased by a factor of:
Question 5 of 5
The time between the transmission of a pulse and the reception of the echo from a target is 1720 microseconds. What is the range of the target?
9 more questions in this chapter
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