Patent ID: 8392107

Claim:
An apparatus for determining at least one location in a structure or proximate to the structure, the structure comprising an electrical power line infrastructure located in a structure, the apparatus comprising: two or more first transmitters configured to couple to the electrical power line infrastructure, the two or more first transmitters further configured to inject at least two first electrical signals into the electrical power line infrastructure such that the electrical power line infrastructure emanates radiated energy from the at least two first electrical signals; at least one positioning tag configured to wirelessly receive the radiated energy from the at least two first electrical signals in the electrical power line infrastructure; and a software module configured to receive first data about the radiated energy from the at least two first electrical signals, the software module is further configured to process the first data to determine a first location proximate to the electrical power line infrastructure of the at least one positioning tag, wherein: the at least one positioning tag is not electrically coupled and is not physically coupled to the electrical power line infrastructure; the at least one location comprises the first location; and the software module is configured to run on at least one of a computer or the at least one positioning tag.