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GPS chip on a mobile phone SIM card
April 28, 2007
This is very interesting - a full GPS chip built in to a mobile phone SIM card. How does a small GPS chip pick up the signals from the satellites? The solution to this has been to use the phone body as the antenna.
GPS receivers have been rapidly shrinking in recent years, but this marks a massive reduction in size as well as the technical feat of receiving GPS satellite signals from a space sandwiched between the phone battery and circuit board. It's A-GPS, so much of the processing is done off the SIM, using data sent over SMS or similar, but the technical challenges are still considerable.
This is a seriously low-power GPS receiver:
BlueSky Positioning CEO Risto Savolainen said: "We are only allowed [by the GSM SIM standard] to draw six milliamps, which was a challenge."
Posted by Kathie on April 28, 2007 12:52 PM.
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