4
votes
2answers
376 views

How does GPS calculate time

How can a GPS device give exact timing even when the number of available satellites are zero? I'm monitoring GPS data using VisualGPS.
2
votes
5answers
337 views

GPS and Communication (802.11, BT, GSM/GPRS, etc.) ICs

I'm trying to do the preliminary proposals for a small, low power, low cost unit that is capable of reporting it's location to a central service. These devices will generally be in a small urban ...