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Sensor networks offer an opportunity for improving submarine detection. Let each sensor firstly make a binary local decision-‘0’ or ‘1’, and then a fusion center collects them to make a system-level inference without knowledge of probabilities of local detection. An obvious strategy is a counting rule test, which simply counts the total number of 1's and compares it to a threshold. This approach equally...
The cooperation of an active acoustic source and a large number of distributed passive sensors offers an opportunity for active sonar detection. The system works as follows: first, each sensor compares its matched filter output with a given threshold to obtain a binary local decision—“0” or “1”; then, a fusion center (FC) collects them to make a system-level inference. How effectively to combine these...
In this paper, the corrosion damage of the aluminum alloy specimens were studied at different temperature for various corrosion times. The surface corrosion damage ratio of aluminum alloy structure was defined to reveal the degree of pit corrosion intensity. Based on the probability model of pitting corrosion growth, a new probability model capable of simulating the surface corrosion damage is developed...
We propose a novel method for detection, synchronization, and Doppler scale estimation for underwater acoustic communication using orthogonal frequency division multiplex (OFDM) waveforms. The method involves transmitting two identical OFDM symbols together with a cyclic prefix, while the receiver uses a bank of parallel self-correlators matched to different Doppler scaling factors on waveform dilation...
Precise positioning is one attractive application of ultra wideband (UWB) systems. Its enormous bandwidth has generated high expectation on the spatial resolution that it could achieve. However, synchronization in the presence of dense multipath is challenging, since the first arrival is not necessarily the strongest one due to channel fading. It is unclear how high a spatial resolution can be realized...
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