By the way - should the UUV be so good in detecting LF noise ? It's a small device and often performs better than hull-mounted sub sonars ! It's because sub sphere sonars works from 800Hz up, hull sonars 100Hz up, but UUV sonar works from 0Hz up - detects LF all the way down to zero!
Shouldn't such small device have higher low frequency limit that big submarine hull sonars ? In theory even it's small physical dimensions only should seriously reduce their LF performance... Same for torpedo passive seekers...
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