Exact(4)
Study and characterization of distant shipping component of ambient noise in shallow water aid in design of passive surveillance algorithms and effective signature analysis of marine vessels.
This letter presents the work carried out on real ambient noise recording in very shallow water condition close to a commercial port with heavy shipping activity to study and characterize the distant shipping noise component for variations due to tide.
The study concluded that the distant shipping noise component due to heavy small vessel activity in the nearby port resulted in up to 35 dB variation in the shallow water ambient noise in coastal areas that may have serious implication on passive surveillance algorithms performance in the vicinity if adequately not addressed.
He dismissed the distant shipping containers as insignificant.
Similar(54)
As one young survivor hopefully tries to signal to a distant ship, an old man sitting among the dead has already given up hope.
Blue Sea and Distant Ship probably dates from the early 1840s, though there is not much to distinguish it from similar works of 10 or even 20 years earlier.
Yet, for all their abstract appeal to modern eyes, Blue Sea and Distant Ship, and other watercolours and oil paintings made in the same spirit, are determinedly figurative.
He agreed to the American commander's proposal that to improve accuracy, future strikes would be carried out by American aircraft rather than by cruise missiles fired from distant ships. 1 2 Next Page » Andrew W. Lehren contributed reporting from New York.
Defenses included long-range chaff rockets to mask a vessel from the radar of distant ships, close-in quick-blooming chaff flares to confuse active radar homers on missiles, and radar jamming to defeat acquisition and tracking radars and confuse missile seeker systems.
The instrument catches "the voice of a porpoise using echolocation to feel its way through the depths; the hiss of strong currents stirring sand along the bottom; the innumerable tiny crackles and snaps that rise from hordes of crab, shrimp, bivalves and unnamable bottom-crawling creatures; the rapid pulsing of a distant ship's propeller".
The summer is to be spent at the seaside, in Massachusetts (the film's locations included Marshfield and Duxbury), where the next-door neighbor is Betty (Allison Janney), a lush with a leathery tan and a voice that can be heard by distant ships.
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