Which statement correctly describes the sensing method of a Proximity Fuze?

Which statement correctly describes the sensing method of a Proximity Fuze?

• A. Uses infrared sensor to detect proximity.
• B. Uses a GPS timer to detonate.
• C. Uses Doppler radar to measure time between transmission and reception.
• D. Uses acoustic signals to detect proximity.

Answer: (C)

Proximity fuzes need a sensing method that reliably tells when the target is within a programmed radius so they can detonate at the optimal moment. Doppler radar achieves this by actively transmitting a signal and listening for the echo; the Doppler shift of the reflected wave caused by the target’s motion provides a real-time indication of how close the target is and how fast it’s approaching. When the detected proximity crosses the preset threshold, the fuze triggers. This approach works in darkness, smoke, or debris and is more reliable for fast-moving projectiles than relying on a heat signature, a timer, or sound alone. Infrared sensing relies on heat signatures and can be unreliable in variable conditions; a GPS timer detonates based on elapsed time rather than proximity; acoustic sensing is ineffective at high speeds and over long distances.

Proximity fuzes need a sensing method that reliably tells when the target is within a programmed radius so they can detonate at the optimal moment. Doppler radar achieves this by actively transmitting a signal and listening for the echo; the Doppler shift of the reflected wave caused by the target’s motion provides a real-time indication of how close the target is and how fast it’s approaching. When the detected proximity crosses the preset threshold, the fuze triggers. This approach works in darkness, smoke, or debris and is more reliable for fast-moving projectiles than relying on a heat signature, a timer, or sound alone.

Infrared sensing relies on heat signatures and can be unreliable in variable conditions; a GPS timer detonates based on elapsed time rather than proximity; acoustic sensing is ineffective at high speeds and over long distances.