* Question
| At present, what are the positioning technologies developed by some research institutions? |
* Answer
| (1) Use the interesting environment features to achieve the positioning of the nodes.This technique uses information such as temperature, humidity, ambient noise, spectral energy, and received signal strength to identify the location of a node (Chen et al., 2007).
(2) Make full use of the information of connectivity.There are several movement modes, we can use the sequential Monte Carlo (se.quential Monte Cado) positioning method.The mobility of the node to be located can improve the accuracy of positioning and reduce the cost of positioning (Hu et al., 2004). (4) An iterative method for minimizing the positional least square difference. 5) Adopt an iterative algorithm to implement network deployment of nodes.Because such a problem is NP.Hard problem, we can use the approximate method: weak deployment and strong deployment.Both deployments provide upper and lower limits for node location uncertainty (Basu et al., 2006). (6) Use the mobile node as a beacon node.However, the sensor may not be deployed in the expected location, but it can contact its neighbor nodes and rely on probabilistic methods to estimate its location (Fan9 et al., 2005). |
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