Delayed GeoTagging

摘要

Various methods, apparatuses, and systems for providing a delayed geotag using GPS devices are described. The GPS device includes a wireless receiver configured to receive satellite state data and satellite range measurements from a plurality of satellites, a communications interface in communication with a media device, and a position engine configured to calculate a geotag. The GPS device can be configured to receive satellite range measurements from one or more satellites at a first point in time when the satellite state data for a minimum number of the satellites is unavailable, and to calculate the satellite state data at that time using satellite state data received at a second, later point in time. The satellite state information at the first point in time is calculated using an algorithm to extrapolate the satellite state data back to the first point in time when the satellite range measurements were made. The GPS device can calculate a geotag using the calculated satellite state data at the first point in time and the corresponding satellite range measurements.

主权项

1. A Global Positioning System (GPS) receiver configured to provide a geotag comprising:
a wireless receiver configured to receive satellite state data and satellite range measurements from a plurality of satellites; a communications interface in communication with a media device and configured to:
receive polling signals from the media device, the polling signals inquiring whether satellite state data is acquired; andsend a status response signal upon reception of each polling signal, the status response signal indicating whether the satellite state data is acquired; a position engine configured to:
receive the satellite range measurements from one of a minimum number of at least four satellites at a first point in time when the satellite state data from the one satellite is unavailable;receive the satellite state data from one or more of the minimum number of satellites other than the one satellite at the first point in time;calculate, for the one satellite for which only the satellite range measurements were received, the satellite state data at the first point in time based on satellite state data received for the one satellite at a second, later point in time using an algorithm to extrapolate the satellite state data at the second, later point in time back to the first point in time when the satellite range measurements were made; andcalculate a full geotag using the calculated satellite state data for the one satellite at the first point in time, the satellite state data received at the first point in time for all of the other minimum number of satellites, and the satellite range measurements.