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GPS and wireless based LBS integration

 
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Leofly
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Joined: Feb 07, 2009
Posts: 9

PostPosted: Tue Feb 24, 2009 8:53 pm    Post subject: GPS and wireless based LBS integration Reply with quote

What is typical integration algorithm? Does the system usually wait for GPS fix and takes network based positioning only after GPS fails? (some GPS timeout should be assumed).
Or it starts from the network based LBS and then jumps you to the GPS precise position?
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Darren
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Joined: 11/07/2002 14:36:40
Posts: 23847
Location: Hampshire, UK

PostPosted: Thu Feb 26, 2009 6:05 pm    Post subject: Reply with quote

I'm not sure there is any such thing as a 'typical' algorithm. What kind of wireless positioning do you refer to, WLAN or GSM?
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MikeB
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Joined: 20/08/2002 11:51:57
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Location: Essex, UK

PostPosted: Thu Feb 26, 2009 6:11 pm    Post subject: Reply with quote

Judging from some of the seminars I have attended and looking at the iPhone behaviour I would say:

The system will use the first positional data available. As more accurate data is available that is used until you have the most accurate position. It may be that you only have WiFi or Cell Triangulation if you are inside, but outside you should get GPS, though this will typically be the last to come available.

Depending on the SDK you are using you will also get some indication of the accuracy of the position.
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Leofly
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PostPosted: Thu Mar 05, 2009 10:52 am    Post subject: Reply with quote

MikeB, I see. But the question is actually about TTFF.
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