Which statement best describes the towed-array sonar compared to hull-mounted?

Which statement best describes the towed-array sonar compared to hull-mounted?

• A. The hull-mounted sonar is fixed in the hull; the towed-array is deployed behind the vessel to reduce self-noise.
• B. The towed-array is fixed in the hull; the hull-mounted is deployed behind.
• C. The towed-array is deployed behind the vessel to reduce self-noise and extend detection range.
• D. The hull-mounted sonar operates only on surface ships.

Answer: (C)

The main idea is that where the sensor sits and how it interacts with the ship’s own noise determines its performance. A towed-array is dragged behind the vessel, away from the hull, which helps it hear more clearly by reducing the ship’s own noise, vibrations, and wake clutter. This isolation lets the array use longer, lower-frequency listening elements, and those low frequencies travel farther in seawater, giving you a longer detection range. That combination—lower self-noise and extended range—is what makes the towed array advantageous over a hull-mounted system. If you think about the alternatives, a hull-mounted sonar is fixed to the hull and picks up more of the ship’s noise and flow effects, limiting its low-frequency performance and practical range. And hull-mounted systems aren’t restricted to surface ships; submarines also employ hull-mounted sonar. So the statement that best captures the difference is that the towed-array is deployed behind the vessel to reduce self-noise and extend detection range.

The main idea is that where the sensor sits and how it interacts with the ship’s own noise determines its performance. A towed-array is dragged behind the vessel, away from the hull, which helps it hear more clearly by reducing the ship’s own noise, vibrations, and wake clutter. This isolation lets the array use longer, lower-frequency listening elements, and those low frequencies travel farther in seawater, giving you a longer detection range. That combination—lower self-noise and extended range—is what makes the towed array advantageous over a hull-mounted system.

If you think about the alternatives, a hull-mounted sonar is fixed to the hull and picks up more of the ship’s noise and flow effects, limiting its low-frequency performance and practical range. And hull-mounted systems aren’t restricted to surface ships; submarines also employ hull-mounted sonar. So the statement that best captures the difference is that the towed-array is deployed behind the vessel to reduce self-noise and extend detection range.