RADAR THEORY

The minimum range of a primary radar, using the pulse technique, is determined by the (1) …..; the maximum unambiguous range by the (2) …..

• A(1) pulse length (2) pulse recurrence frequency
• B(1) transmission frequency (2) transmitter power output
• C(1) Pulse length (2) length of the time base
• D(1) Transmission frequency (2) pulse recurrence frequency.

Which of the following statements is correct concerning the use in primary radar of continuous wave transmissions as compared with pulse transmission?

• AA smaller common transmitter and receiver aerial can be used.
• BIt is less effective in short range radars but more effective in long range radars.
• CIt eliminates the minimum target reception range.
• DThe equipment required is more complex in continuous wave radar but this is offset by greater reliability and accuracy.

Primary radar operates on the principle of:

• ATransponder interrogation.
• BPulse technique.
• CPhase comparison.
• DContinuous wave transmission.