Which radar method uses continuous energy without pulsing?

Which radar method uses continuous energy without pulsing?

• A. Pulse Modulation
• B. Pulse Doppler
• C. Frequency Modulation
• D. Continuous Wave (CW)

Answer: (D)

Continuous energy without pulsing means the radar transmitter is on all the time, never emitting in short bursts. That’s the defining trait of Continuous Wave radar: a steady carrier is radiated continuously. Because there are no gaps to listen for a return, you can’t measure distance by time delay with a pure CW signal; instead, CW radars are typically used to determine speed through Doppler shifts of the reflected signal. The other options rely on pulsing or on altering the signal to get range information: pulsed systems send bursts and use round-trip time to gauge distance; pulse Doppler combines pulsed transmission with Doppler processing for both range and velocity; frequency modulation (FM-CW) uses a continuous wave that is frequency swept to derive range from beat frequency, but it still differs from a simple pulsed approach.

Continuous energy without pulsing means the radar transmitter is on all the time, never emitting in short bursts. That’s the defining trait of Continuous Wave radar: a steady carrier is radiated continuously. Because there are no gaps to listen for a return, you can’t measure distance by time delay with a pure CW signal; instead, CW radars are typically used to determine speed through Doppler shifts of the reflected signal.

The other options rely on pulsing or on altering the signal to get range information: pulsed systems send bursts and use round-trip time to gauge distance; pulse Doppler combines pulsed transmission with Doppler processing for both range and velocity; frequency modulation (FM-CW) uses a continuous wave that is frequency swept to derive range from beat frequency, but it still differs from a simple pulsed approach.