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With the continuous progress of rural construction, the problem of rural drinking water pollution is increasingly prominent. In view of water pollution, a design of rural drinking water monitoring system based on wireless sensor networks is proposed that nodes take STM32 as the core chip and WLK01L39 as well as its peripheral circuits are used as wireless communication modules and Beidou S1216 is...
In recent years, Wireless Sensor Networks (WSNs) have become valuable assets to both the commercial and military communities with applications ranging from industrial control on a factory floor to reconnaissance of a hostile border. A typical WSN topology that applies to most applications allows sensors to act as data sources that forward their measurements to a central sink or base station (BS)....
Node in WSN has its own local clock, and it's difficult to achieve long-term time synchronization between nodes due to some internal and external factors. Within the factors, some internal attackers (group members) report false clock references to their neighbor nodes. Considering the special circumstance that some nodes of the wireless sensor network are faulty, an improved HRTS algorithm named T-HRTS...
This paper describes a newly developed wireless access system for the wide area ubiquitous network (WAUN), a large cell-based public sensor network. It introduces two key technologies to achieve WAUN with wide area coverage. The first is a digitalized radio over optical fiber (DROF) subsystem that allows cost-effective commercial packet based networks to transfer wireless RF signals among distributed...
The demand for economical wireless sensor nodes have been increased due to advancement in processor, memory and wireless communication techniques. To give the on time and fast response for different actions, wireless sensor nodes work together in cooperation with each other. The most important requirement to maintain the co-ordination among different nodes during execution of an application is perfect...
Wireless Sensor Network for their rapid deployment can be used in habitat monitoring for detecting fire and in disaster for helping rescue teams. Node localization is key factor for some applications. We propose the Triangular Centroid Localization algorithm (TCL). It is based in simple trigonometric figures and it does not require special hardware or synchronization time. In our simulations using...
One of the most promising technologies for tomorrow's sensor networks are wireless approaches. Mesh networks using ad-hoc concepts are very popular, but have the drawback that real-time constraints cannot easily be fulfilled, because data transmission times are not fully deterministic. On the other hand, infrastructure networks based on central access points are limited in their range. For time-critical...
At present, domestic researchers of wireless sensor network concentrate their attentions on the ZigBee's applications, and there is no public protocol stack, the purpose of this study is to realize the ZigBee protocol stack, then user could break away from depending on the underlying protocol API interfaces. Based on the in-depth analysis of the ZigBee protocol architecture, this paper described in...
Wireless sensor networks are deployed to monitor real-world phenomena, and are seeing growing demand in commerce and industry. These networks can benefit from time synchronized clocks on distributed nodes. The precision of time synchronization depends on error elimination or reliable estimation of errors associated with synchronization message delays. This paper examines an approach to time synchronize...
Wireless Sensor Network is an emerging technology which can significantly reduce the cost and the time needed to monitor the conditions of civil structures. This work presents W-TREMORS, a new wireless sensing system for high-frequency distributed data acquisition. Our sensor network is based on the low-power and low-data rate standard IEEE 802.15.4, and we used inexpensive hardware. Nevertheless,...
A method of precise time synchronization of wireless sensors employing an IEEE 802.15.4 transceiver, and specifically employing the 6LoWPAN protocol, was developed. It uses the IEEE 1588 synchronization standard and the IEEE 1451.5 Smart Transducer Data standard. A Wireless Transducer Interface Module (WTIM) was designed and fabricated. It utilizes the IEEE 802.15.4 transceiver model TI CC2430 which...
Reliable communication is crucial for successful deployment of a wireless sensor network. Many environmental factors can affect the performance of radio links, and the deployment of a network without real-time information about link qualities can be a demanding task. This paper describes the CiNetView application that is intended to support the deployment and monitoring of wireless sensor network...
Wireless Sensor Network based on clustering robots are designed, clock synchronization principle of wireless network and typical time synchronisation algorithms are researched. The time synchronization algorithm based on send/receive proposed two-way synchronization mechanism and the flooding algorithm improve in combination with TPSN and FTSP algorithm; the key factors affecting the accuracy are...
For improving throughput and energy efficiency in wireless sensor networks, multi-channel media access control has been proposed. Existing multi-channel MAC protocols are mainly focus on channel assignment and media access, it means that a senor node is bound with one channel, which makes the whole network inflexible and cannot be adapted to the variations of environment. In this paper, we proposed...
The objective of Synchronization In wireless sensor network is to synchronize the various sensor nodes which are distributed as well as moving in a network. Synchronization is an important problem in communication networks especially for real time applications. There may be one base station of 1000 sensor nodes moving in the network. Synchronization is considered a particularly difficult in wireless...
Broadcast authentication plays an important role in wireless sensor networks. In this paper, we propose key predistribution based broadcast authentication scheme. In the scheme the base station can derive all keys used for broadcast authentication from initial parameters and sensor nodes are just able to deduce keys excluding authentic keys from initial parameters stored before deployment according...
In some algorithms of wireless sensor network (WSN), all cluster heads are re-elected in strict accordance with global synchronization, even if some cluster heads sending few packets have to be re-elected when the time of a round is over. Based on low energy adaptive clustering hierarchy(LEACH), asynchronous clustering algorithm is proposed in this paper. The algorithm means that after the first time...
Wireless sensor network characteristics contain limited power to store, ability to withstand harsh environmental conditions, ability to cope with node failures, mobility of nodes, dynamic network topology, heterogeneity of nodes, communication failures and large scale of deployment. The traditional cryptographic protocol models are not suitable in low power sensor nodes due to inherent resource and...
Time synchronization is the most important component in wireless sensor network (WSN). Since, it improves energy efficiency, lifetime, robustness, precision and so on. The final goal of WSN is smart dust. So, WSN devices can't use expensive crystals. Although diversity algorithms were proposed for time synchronization, most of the algorithm have disadvantage when they get out from their assumptions...
In this paper, we proposed a novel multi-agent-based interoperable wireless sensor network (WSN) model. It provided generalized frameworks to address some critical issues existed in the WSN such as interoperability, time synchronization, power management and distributed computation. To address these issues, we developed a model that was based IEEE 1451 and IEEE 1588 standards to address sensor interoperability...
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