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What factors limit the range of sonar systems?
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submarine
The former USS Nautilus, launched in 1954, being towed to Groton, Connecticut, to become a museum, May 1985.
The range of sonar systems used for detecting submarines is primarily limited by the following factors:
- Attenuation: Sound energy naturally weakens as it travels through water, which reduces the effective range of both active and passive systems.1
- Refraction: Variations in water temperature, salinity, and pressure cause sound waves to bend. This refraction can create "shadow zones" that sound waves do not penetrate, making it difficult to detect objects located within those areas.21
- Extraneous Noise: The presence of background noise, including reflections from the sea bottom and noise pollution from human activities like shipping or seismic testing, can interfere with the detection of target signals.21
- Frequency: Higher-frequency sounds are absorbed and converted to heat more rapidly than lower-frequency sounds, which limits the distance they can travel.2
Because of these physical limitations, naval forces must often deploy large networks of sensors—such as sonobuoys or seabed arrays—to maintain effective surveillance over broad ocean areas.3