Unassisted indoor GPS receiver

Details Unassisted indoor GPS receiver Unassisted indoor GPS receiver

2005-12-29

2009-08-04

Issing, Gregory C (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

C455S343200

Reexamination Certificate

active

07570208

ABSTRACT:
The present invention provides GPS receivers capable of tracking very weak GPS signals particularly in an indoor environment without assistance from an external server or a network. In a preferred embodiment, a GPS receiver initially acquires and locks onto GPS satellite signals to compute receiver position outdoors. The GPS receiver then tracks at least one satellite signal indoors to maintain acquisition parameters for quick acquisition of GPS signals. To save power, the receiver automatically goes to the sleep state and periodically wakes up, i.e., powers up, to maintain the at least one satellite signal tracking. During the wakeup state, the receiver collects ephemeris data from the at least one satellite signal when the ephemeris data needs to be updated for quick acquisition of GPS signals.

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