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In this paper, a novel approach to high resolution underwater acoustic imaging is proposed for limited aperture. The proposed imaging approach is based on cross-correlation and high resolution is achieved by using ultra-wideband (UWB) signals in combination with cross-correlation processing. The idea of the proposed imaging approach is that cross-correlation of a pair of the received UWB signals can...
A spherical hydrophone is developed. The equivalent circuit model and finite element model about the thin piezoelectric spherical shells have been built to predict its major performances. Some hydrophone prototypes have been fabricated and the corresponding tests in the anechoic tank have been finished. The results show that the above two way to design and simulate the thin piezoelectric spherical...
In order to improve the robustness of Adaptive Matched Field Processing(AMFP), a Conditional Probability Constraint Matched Field Processing (MFP-CPC) is proposed. The algorithm derives the posterior probability density of the source locations from Bayesian Criterion, then the main lobe of AMFP is protected and the side lobe is restricted by the posterior probability density, so MFP-CPC not only has...
Phytochemical investigation of the fruiting bodies of Ganoderma capense led to isolation of eight aromatic meroterpenoids (1–8). Ganocapensins A and B (1, 2) possessed a thirteen-membered and a fourteen-membered ether rings, respectively. The structures of new isolates including absolute configuration were elucidated on the basis of extensive spectroscopic technologies and Mosher's method. All isolated...
When under uncertain ocean environment, the environmental model of matched field processing (MFP) is different from the real world. The performance of MFP decreases largely beacuse of the environmental mismatch. In order to improve its robustness to the environmental mismatch, a MFP with posterior probability constraints (MFP-PPC) is proposed. The algorithm derives the posterior probability density...
Contemporary researches on Network-on-Chip (NoC) have seen advancements in both software application mapping and hardware implementation techniques. However, two important issues remain untouched: (1) while single-application mapping algorithms are focused, few multi-application mapping methodologies exist in the literature, and (2) with HW and SW technologies developed in nearly orthogonal tracks,...
Media player plays a very important role in real-time video surveillance. But currently many media players, which are based on DirectX, Flash and ActiveX, have many problems such as installation failure, maintenance cumbrance, security defects and so on. With the rapid development of HTML5 technology, the HTML5 video tag is very excellent for static video files, but currently it is not very suitable...
In embedded Linux applications, the power failure may lead to the abnormity of the FAT file system. An effective repairing algorithm for the FAT file system was designed and implemented in this paper. The scanning files method based on tree structure was utilized as the core of repairing algorithm. FAT tables and cluster markers were adopted to improve the memory efficiency. Furthermore, the abnormities...
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