Long before the advent of GPS tracking, efforts had been made to enable accurate location measurement inside buildings for several applications. Various factors, especially lack of sufficiently sensitive or powerful chips capable of running suitable algorithms, prevented much progress being made and meanwhile GPS came along to enable increasing accurate RTLS (Real Time Location Systems). But this only worked outdoors because satellite signals are too weak to penetrate building walls. This galvanized efforts to emulate GPS capabilities indoors through low powered wide spectrum radio, with the IEEE 802.15.4a PHY standard emerging as a leading contender for the wireless protocol. This standard is already widely implemented, being the basis of Zigbee and other low power wireless protocols, including 6LoWPAN. Decawave, founded…