Method and/or system for obtaining signatures for use in navigation

摘要

Disclosed are systems, methods and techniques for obtaining round trip time (RTT) measurements from acquisition of signals at one or more mobile devices, the signals being transmitted by one or more transmitters; approximating locations of the one or more mobile devices while obtaining the RTT measurements; and combining the measurements to determine expected RTT signature values at discrete positions in the area based, at least in part, on the obtained RTT measurements and the approximated locations.

主权项

1. A method comprising:
obtaining a first plurality of round trip time (RTT) measurements from acquisition of signals by a plurality of mobile devices, said signals being transmitted by one or more transmitters; identifying a selected type of receiver used to acquire at least one of said signals by at least one mobile device of said plurality of mobile devices, said selected type of receiver being selected from among multiple types of receivers; approximating locations of at least a portion of said plurality of mobile devices, wherein said approximated locations are of said at least said portion of said plurality of mobile devices during a time that said at least said portion of said plurality of mobile devices are obtaining at least a first portion of said first plurality of RTT measurements, and wherein said approximated locations are derived based upon other than said at least said first portion of said first plurality of RTT measurements; selecting a second plurality of RTT measurements comprising at least a portion of said at least said first portion of said first plurality of RTT measurements, wherein said second plurality of RTT measurements corresponds to said selected type of receiver; and combining said selected second plurality of RTT measurements to determine expected RTT signature values at discrete positions in an area based, at least in part, on said selected second plurality of RTT measurements and said approximated locations, wherein said expected RTT signature values are for application by said at least one of said plurality of mobile devices employing said selected type of receiver.