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As one of the dominant techniques for sensing the underwater environments, underwater vision has shown great prospects in ocean investigations and explorations over the last decades. The vision system is usually installed on the platforms of autonomous underwater vehicles (AUVs). Due to the limitation of transmission and storage for underwater signals, it is extremely urgent to explore an efficient...
A long "V" shaped linear wake with lots of bubbles is formed behind a sailing ship, which provides a target feature of the ship. Ship wake acoustic detection is one of the most effective ways for the Autonomous Underwater Vehicle to automatically search, track and attack surface targets. In this paper, we processed the sonar image data of ship wake in the lake test, using the sonar image...
As a new generation of deep-sea Autonomous Underwater Vehicle (AUV), Qianlong I is a 6000m rated glass deep-sea manganese nodules detection AUV which based on the CR01 and the CR02 deep-sea AUVs and developed by Shenyang Institute of Automation, the Chinese Academy of Sciences from 2010. The Qianlong I was tested in the thousand-isles lake in Zhejiang Province of China during November 2012 to March...
Introduces the composition of the deep-sea HD camera system based on MIPI interface and the performance, technical characteristics, and the application prospect of HD camera system under water in the water in geological exploration prospects.
In order to solve the contradiction of high azimuth resolution and wide swath in sonar and radar imaging, narrowband compressed sensing (CS) imaging has been studied in depth. This paper studies the wideband sonar imaging method via CS. Wideband CS imaging model is constructed. Scaling and Doppler frequency shift are considered in the model. The effect of wideband signal to traditional narrowband...
The AIS (Universal Ship-borne Automatic Identification System) is required to install in international ships with 300GT or above and domestic ships with 500GT or above. Nowadays, many ships are transmitting the AIS information. The received AIS information from other ships, is displayed on navigation equipment such as ECDIS (Electronic Chart Display and Information System). This information is used...
While our understanding of underwater acoustic communications has improved, communications involving mobile assets (e.g., gliders and AUVs) remains quite challenging. In September 2011, the MArine Cable Hosted Observatory (MACHO) was launched in the northeastern sea off Taiwan for surveillance of submarine earthquakes, tsunami, and the ocean environment. The MACHO system, administrated by the Central...
We simulated time reversal communication with using simple ray theory. Assuming equable temperature and a static water tank, we geometrically calculated the multipath waves with using Pythagorean Theorem. We simulated both time reversal and general BPSK communication by using 10 kHz bandwidth. The result shows this simulation is available for time reversal simulation under the specified situation...
Several geological processes introduce a discrepancy between the geothermal gradient derived from heat probe measurements on the seafloor and gradients derived from gas hydrate-related bottom-simulating reflectors (BSRs) at a few hundred meters below the seafloor. We use a wide-spread BSR offshore SW Taiwan in 3D seismic data and an in-situ thermal probe dataset, in addition to 3D finite element modeling,...
We use singular spectrum analysis techniques to discriminate the underlying signals within the HadCRUT4 global surface temperature record. Our analysis identifies a multidecadal oscillation (related to natural oscillations) and a secular trend (assumed to be representative of anthropogenic-induced warming) as the two main signals within the temperature record. Most current generation global circulation...
This paper presents an internationally interoperable marine meteorological information service implemented with the Automatic Identification System (AIS). The service is delivered with both the shore-side system and the shipboard application platform. It is targeted not only to providing services to AIS-fitted vessels but also to collecting weather reports from ships. The intended coverage area includes...
DONET (Dense Ocean-floor Network system for Earthquakes and Tsunamis) is a submarine cabled real-time observation network for earthquakes and tsunamis monitoring around the Nankai trough, southwestern Japan. The scheduled twenty observatories have operated since August 2011. Various sensors such as a broadband seismometer, a pressure gauge, a hydrophone, etc. are equipped with each observatory, because...
The reliability of two-and-a-half-year surface velocity data collected from the two High-Frequency radar systems (CODAR) operated at Suao and Han-Ben northeast of Taiwan is evaluated via comparison with real-time drifter trajectory. The result suggests apparent seasonal dissimilarity which might due to strongly stratified water characteristic at observing area, and the localized large differences...
Sonar image automatic target recognition (ATR) is urgently needed in large-scale marine investigation. A modelbased Sonar image ATR method based on SIFT features is proposed in this paper. The proposed method can realize ATR for arbitrary shaped target by physically model 3D under water scene, generate simulated template images, extract Scale-invariant feature transform (SIFT) keypoints and matching...
The islands have plentiful renewable recourses such as solar, wind, wave, tide energy. They can not only improve the power supply ability of hybrid system on the island, but also minimized the operating frequency of the diesel power generation unit, which could contribute to environment protection. In this paper, a multi-objective optimization model is presented with the economy and power supply reliability...
This paper describes a ROV-based automated cable-laying system that can automatically payout a thin optical-fiber submarine cable while keeping balance with the ground speed and adjusting the degree of cable tautness. This system has been developed to reduce the physical and mental burdens on the ROV operator(s) and to speed up the construction of DONET (Dense Oceanfloor Network System for Earthquakes...
This paper presents the implementation of precise underwater navigation system using two acoustic ranging sonars for shallow water depth application. Estimation of accurate positions is a key issue to achieve qualified navigation solution used for underwater construction and survey using side scan sonar, multi-beam echo-sounder, scanning imaging sonar, sub-bottom profiler and underwater camera image...
This paper introduces the SBE-19plus SEACAT profiler and points out the problems exist in its applications. To solve the problem of limited energy and to get CTD data real-time display with easy operation, the paper gives a brief design of remote power supplied CTD real-time monitoring system and its detailed software design. Finally, the paper gives the test result which proves that the system can...
It cannot be guaranteed that array spacing corresponding to half-wavelength of each frequency when broadband signals are processed by passive detection scheme. Therefore, for high-frequency, side lobe will rise when array spacing is half the wavelength of the low-frequency. In addition, the main lode of small-scale array will be wider due to limited array aperture. In order to resolve these two disadvantages...
Aiming at the demand of marine environment observation and realizing AUV industrialization, A portable autonomous observation system (PAOS) was built by Shenyang Institute of Automation. In 2013, Lake trial, sea trial and the standard sea trial was conducted. This paper describes system components, control system design of the PAOS, trial process and test result.
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