Patent ID: 8442801

Claim:
A method comprising: providing a plurality of location anchor transceivers and a plurality of enhanced location anchor transceivers operating from respective predetermined locations within a region at least some of the enhanced anchor transceivers including a respective gas detector; a portable transceiver within the region detecting and measuring a signal parameter of a signal from at least some of the plurality of location anchor transceivers and enhanced location anchor transceivers, the portable transceiver including a gas detector; the gas detectors of the portable transceiver and at least some enhanced location anchor transceivers measuring and reporting a gas concentration to a location manager module; a location engine of the location manager module calculating an estimated location of the portable transceiver based upon the signal measurements of the portable transceiver and the respective predetermined locations of the plurality of location anchor transceivers and enhanced location anchor transceivers; at least some of the plurality of enhanced location anchor transceivers detecting and measuring a signal parameter of a signal from at least some of the plurality of location anchor transceivers and other enhanced location anchor transceivers; the location engine calculating an estimated location of the at least some of the plurality of enhanced location anchor transceivers based upon the signal measurements of the at least some of the enhanced location anchor transceivers and the respective predetermined locations of the plurality of location anchor transceivers and enhanced location anchor transceivers; calculating a location error for the portable transceiver and each of the at least some of the plurality of enhanced location anchor transceivers based upon the estimated location and predetermined location of the enhanced location anchor transceiver; and a display of the location manager module depicting a map of the region including a designated location of at least some of the plurality of enhanced location anchor transceivers, an estimated location of the portable transceiver, a gas concentration profile across the region and a location error of the portable transceiver.