Position tracking apparatus and method for a low power wpan/wban device

A position tracking apparatus, comprising:

• a measured distance collector that collects distance information of adjacent nodes from a plurality of anchor nodes whose positions are known by being fixed and at least one sensor node whose positions are not known, respectively, in a sensor network;
• a shortest distance calculator that calculates each of the shortest paths to the anchor nodes based on the distance information of the collected adjacent nodes and selects and manages a sensor node having the shortest path and shortest distance for the anchor node as a parent node;
• a group separator that separates nodes in the sensor network into a first group whose positions are known and a second group whose positions are not known according to whether the positions of each node are known, the anchor node being included in the first group;
• and
• a controller that selects a first sensor node nearest to the nodes of the first group from the second group to find its parent node and that corrects the distance information (measuring value) of the shortest path for the anchor node of the first sensor node by reflecting the estimated position of the parent node of the first sensor node and the distance information of the shortest path for the anchor node of the parent node,
• the controller detecting the position of the first sensor node based on the distance information of the corrected shortest path.