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Surveillance is a critical problem for harbor protection, border control or the security of commercial facilities. The effective protection of vast near-coast sea surfaces and busy harbor areas from intrusions of unauthorized marine vessels, such as pirates smugglers or, illegal fishermen is particularly challenging. In this paper, we present an innovative(More)
High accurate indoor localization and tracking of smart phones is critical to pervasive applications. Most radio-based solutions either exploit some error prone power-distance models or require some labor-intensive process of site survey to construct RSS fingerprint database. This study offers a new perspective to exploit RSS readings by their contrast(More)
Existing localization approaches are divided into two groups: range-based and range-free. The range-free schemes often suffer from poor accuracy and low scalabil-ity, while the range-based localization approaches heavily depend on extra hardware capabilities or rely on the absolute RSSI (received signal strength indicator) values, far from practical. In(More)
— In this paper, we propose a novel distributed localization scheme LDB, a 3D localization scheme with directional beacons for Underwater Acoustic Sensor Networks (UWA-SNs). LDB localizes sensor nodes using an Autonomous Underwater Vehicle (AUV) as a mobile beacon sender. Mounted with a directional transceiver which creates conical shaped directional(More)
Underwater acoustic sensor networks (UWA-SNs) are envisioned to perform monitoring tasks over the large portion of the world covered by oceans. Due to economics and the large area of the ocean, UWA-SNs are mainly sparsely deployed networks nowadays. The limited battery resources is a big challenge for the deployment of such long-term sensor networks.(More)
TDMA protocols have attracted a lot of attention for underwater acoustic sensor networks (UWSNs), because of the unique characteristics of acoustic signal propagation such as great energy consumption in transmission, long propagation delay and long communication range. Previous TDMA protocols all allocated transmission time to nodes based on discrete time(More)
Designing of media access control (MAC) protocol is one of the major challenges in underwater acoustic sensor networks. Because of the long and changeful propagation delay, MAC protocols for traditional terrestrial sensor networks are unavailable. We propose a TDMA-based approach which is easy to dispose and energy-efficient. In brief, our MAC protocol(More)
Sensor network systems have received amounts of attention and become a common practice in many fields. These systems are commonly developed by non-standard technologies, which bring lots of difficulties in system integration and interoperability. To figure out this problem, an integrated sensor network system architecture based on Cloud computing is(More)
The integrated monitoring has become an important approach for measurement, investigation, detection in many field and receives amounts of attention. Software development of these systems suffers from low efficient and limited functions due to non-standard technologies. To view the data of different systems, it always needs to develop different remote(More)