sensor network architecture

Then introduce a wireless sensor network architecture that is very typical. Behind the introduction of sensor nodes in the structure, focuses on the characteristics of wireless sensor networks and applications.3. This part is the theoretical basis of the full text. Focuses on three polo shirts shop basic location algorithm: triangular measurement method, triangulation method, as well as maximum likelihood estimation method, the triangular measurement requires hardware support of cheap polo shirts ultrasound, because of the lack of such equipment, in this part of the back did not verify it. Introduce two kinds of mainstream location algorithm, range-based and the range-Free, because of implementation Part of this article are based on the distance of the RSSI (Received Signal custom made prom dresses Strength Indicator, received signal strength) location positioning algorithm , therefore focuses on RSSI technologies, including an empirical model and the three theoretical models, these models are ralph lauren polo shirts described in signal strength and distance relationship. Range-Free algorithm require low hardware and without measuring the absolute inter-node distance or direction, at a rough estimate of women's nike shoes position has a important role. Because of the higher complexity of triangular measurement and maximum likelihood estimation algorithm, which is very unfavorable to the sensor node whose computing resources are limited, In view of this, based on RSSI and centroid algorithm we raise three kinds of weighted centroid algorithms, reduced a lot of complexity.
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