Method and apparatus for determining position in a global navigation satellite system

摘要

A system for determining a position of a device, the system including a receiver module, a communication module, and a location determining module. The receiver module respectively acquires signals from a plurality of satellites totaling in number less than five. The communication module obtains, from a server, via a cellular network or a wireless network, ephemeris data corresponding to one or more of the plurality of satellites. The location determining module determines the position of the device based, at least in part, on (i) the signals acquired from the plurality of satellites, and (ii) the ephemeris data corresponding to the one or more of the plurality of satellites obtained from the server. The position of the device is further determined without a priori knowledge regarding the position of the device.

主权项

1. A system for determining a position of a device, the system comprising:
a receiver module configured to respectively acquire signals from a plurality of satellites totaling in number less than five; a communication module configured to obtain, from a server, ephemeris data corresponding to one or more of the plurality of satellites totaling in number less than five, wherein the ephemeris data corresponding to the one or more of the plurality of satellites totaling in number less than five is obtained by the communication module from the server via (i) a cellular network or (ii) a wireless network; a location determining module configured to generate estimates of an approximate position of the device relative to each of the plurality of satellites totaling in number less than five, without using prior position data of the device, based on
(i) the signals acquired from the plurality of satellites totaling in number less than five, and(ii) the ephemeris data corresponding to the one or more of the plurality of satellites totaling in number less than five obtained from the server; a signal strength module configured to respectively determine a signal strength of each of the signals acquired from the plurality of satellites totaling in number less than five; and an averaging module configured to generate a weighted average of the estimates based on the signal strength of each of the signals acquired from the plurality of satellites totaling in number less than five, wherein the weighted average represents the position of the device.