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 A Wireless Sensor Network Based Distributed Measurement System under Precision Time Protocol Time Synchronization Application in Wireless Sensor Network.
Наименование:

A Wireless Sensor Network Based Distributed Measurement System under Precision Time Protocol Time Synchronization Application in Wireless Sensor Network.

издательство Книга по Требованию Локальные и корпоративные сети
Cтраниц 92        мягкая обложка       
Аннотация:IEEE 1588 is a standard for precise clock synchronization for network measurement and control systems in LAN environment. It works in three steps. The synchronized device sent its time stamp to this sensor node. PTP synchronization is used to translate its clock value to the server? s clock by other devices in LAN. In the finally, we evaluate the PTP and the HRBS time synchronization accuracy and performance. We use HRBS protocol to synchronize all sensor nodes clock in the wireless sensor network. In the thesis, we present a time synchronization mechanism, named Hierarchy Reference Broadcast Synchronization (HRBS), for WSN based on IEEE 802. 15. 4 standard. The proposed system architecture is a hybrid of PTP protocol and HRBS algorithm. Our implement is using the Linux PCs and Chipcon CC2430. The Internet server receives the UTC time from GPS. Time synchronization is an important aspect in wireless sensor networks, especially in distributed measurement system. One of the synchronized devices is connect to the sensor node in the wireless sensor network. We develop into a wireless sensor network base on the distributed measurement system under precise time protocol.
Издательство: Книга по Требованию
Год:2008
Цена:
2007 руб
Нет в наличии
Поиск: A Wireless Sensor Network Based Distributed Measurement System under Precision Time Protocol Time Synchronization Application in Wireless Sensor Network.
НОВЫЙ ГОД СИМВОЛ 2013 ГОДАУКРАШЕНИЯ
КАРНАВАЛ НА НОВЫЙ ГОД РАСПРОДАЖА
Ортомолекулярная медицина Orthomol Устрание причин заболеваний. Ортомоль это новый метод для лечения и профилактики болезней. Orthomol - ортомолекулярная медицина.
Электромагнитная совместимость сотовых сетей связи

Прежде всего, следует упомянуть приложения так называемой "беспроводной последней мили" (Wireless Local Loop, WLL). Такое приложение реализуется в "фиксированных" сетях, не поддерживающих мобильных абонентов. Следует, впрочем, подчеркнуть, что совершенно неподвижными абоненты таких сетей быть не обязаны, - допускается, например, перемещение с места на место в пределах территории, на которой развернута сеть. Наибольший интерес к фиксированным сетям проявляют компании-операторы из развивающихся стран, где необходимо быстро обеспечить связь на большой территории, и на прокладку разветвленной кабельной сети просто нет времени. Помимо недостаточно развитой коммуникационной инфраструктуры, существует и еще одна причина интереса к беспроводным технологиям "последней мили" - большие расстояния. Этот фактор не зависит от уровня экономического развития страны - проложить кабель к удаленному ранчо в Соединенных Штатах ничуть не дешевле (а скорее всего, значительно дороже), чем к какой-нибудь глухой российской деревушке на десять домов.
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