Patent ID: 8988195
Filing Date: 2015-03-24
Classification: G01C,G01S

Abstract:
1. A method for locationing using battery-powered radio frequency based tags within an indoor environment, comprising: distributing a plurality of battery-powered radio frequency based tags at fixed mapped locations within the indoor environment; obtaining an identification of each of the plurality of battery-powered radio frequency based tags; selecting a fixed mapped location where said each of the plurality of battery-powered radio frequency based tags was installed to associate said each of the plurality of battery-powered radio frequency based tags to a physical location corresponding to said fixed mapped location within the indoor environment; said each of the plurality of battery-powered radio frequency based tags periodically transmitting its identity information without being interrogated in a message, wherein said each of the plurality of battery-powered radio frequency based tags is operable to transmit said message at a power level that is limited by said each of the plurality of battery-powered radio frequency based tags such that a transmit range of said each of the plurality of battery-powered radio frequency based tags at fixed mapped locations of neighboring battery-powered radio frequency based tags of the plurality of battery-powered radio frequency based tags that can be received by a mobile device moving within the indoor environment does not significantly overlap such that the mobile device moving within the indoor environment will always be able to receive said message from only one battery-powered radio frequency based tag at a time while moving within the indoor environment; receiving said message by said mobile device moving within the indoor environment when in proximity to at least one of the plurality of battery-powered radio frequency based tags; and associating a physical location of the mobile device moving within the indoor environment to a fixed mapped location within the indoor environment of the at least one of the plurality of battery-powered radio frequency based tags identified in the received message.