title: How to improve accuracy of indoor positioning?
body: <p>I should be developing an indoor positioning system for some place , so I started by gathering info about how to develop such a system , the question I am up to now is : what controls the accuracy of positioning and how to improve it ?
  I found different APIs and projects with various accuracies , for example : ericsson indoor positioning API provides an accuracy within 10 meters , while Qubulus API provides an accuracy within 4 meters , and I met some projects like <a href="http://www.egr.msu.edu/classes/ece480/capstone/spring11/group02/index.html">iDOCNET</a> which claims to provide an accuracy of about 1.2 meters.
  So, what is the main component of the indoor navigating systems that controls the accuracy ?</p>