The rest of this paper is organized into five sections. This paper proposes a method utilizing four mobile beacons to localize unknown nodes in a three-dimensional space. Most of these methods only use a single mobile beacon, which may lead to collinearity problem. The mobile-beacon assisted localization methods become promising. Generally, the locations of beacons are acquired through GPS receiver, so they are more expensive than unknown nodes. And the other sensor nodes, which are called unknown nodes, measure the distances or angles to beacons to estimate their positions. To localize a WSN in the global coordinate system, some special sensor nodes should be aware of their positions as a prior, which are called beacons or anchors. Hence, node localization has attracted lots of research efforts in recent years, and, , presented surveys of these methods.
#Helicon photo geotag map cannot drag manual#
The easiest method is through manual configuration or global positioning system (GPS), which is often infeasible for large-scale and mobile WSNs. The problem of node localization is to determine locations of sensor nodes in a WSN. Moreover, the location information also supports many fundamental network services such as network routing, topology control, boundary detection etc.
In these applications, location information is critically essential and indispensable, because WSNs need associate sensed data with geographical information to make them meaningful. With the rapid development of wireless communications and electronics, wireless sensor networks (WSNs) are applied in many fields, such as object tracking, environment monitoring, vehicle navigation etc.
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