Importance

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Abstract

A wireless communication network includes a number of wireless communication devices capable of sending and receiving wireless communication signals and capable of receiving geographic positioning signals from a satellite that they can use to calculate their geographic position. In the event that one wireless communication device moves into an environment in which it is unable to receive a geographic positioning signal, this wireless device is able to establish an ad hoc network with at least two other wireless devices in the network and to retrieve geographic position information from the two other devices. Furthermore, this device can use time of flight information between itself and the other two wireless devices to calculate the distances between it and each of the two other wireless devices that can be utilized to calculate, in combination with the geographic positions of the other two wireless devices, its geographic position.

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First Claim