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Pacific Environmental Technologies LLC (Pace Tech Hawaii), located in Honolulu, Hawaii, USA has developed a compact mass spectrometer-based instrument for multi-species determination of dissolved gases and volatile organic compounds which can function autonomously or semi-autonomously in water depths ranging to >4000 m. Mass spectrometers were chosen because of their potential for extremely high...
This work focuses on random linear packet coding as an efficient method for reliable high-speed underwater communications over acoustic links with long delay. The transmitter sends coded packets with a pre-determined redundancy over a simplex link with no feedback. The receiver checks each received packet, discarding packets with errors, until the necessary degrees of freedom for successful decoding...
This paper presents the design of an underwater link-joint system for developing of a 200m class six-legged subsea robot. The design includes a process with concept establishment, specific design for joint capability and mechanical drawing. First deals with the definition of degree of freedom which is the link-joint system. Second is the design with calculation of velocity and torque of joints, selection...
Underwater acoustic communications (acomms) technology and capability have reached somewhat of an equivalence with the mobile cell phones of a decade ago. Commercial modems are available from more than a few vendors, but they mainly provide purely an acomms function. At the academic level technology development focuses on increased throughput (or data rate), and/or on the development of undersea networks...
Image quality assessment is a challenging task. Numerous metrics and algorithms have been developed, with a fair share of these efforts focused on referenced targets. For applications associated with most civilian and military needs in the field of intelligence, surveillance, reconnaissance such that automatic target recognition is required, an objective, no reference metric is needed. The task becomes...
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