thoughts on A-GPS offline
helge.hafting at hist.no
Wed Feb 18 16:52:52 CET 2009
Timo Juhani Lindfors wrote:
> mqy <meng.qingyou at gmail.com> writes:
>> It is not a problem that user account is required when download u-blox online
>> aiding data.
> It is a problem since u-blox might go out of business and you might
> not want to tell them where you are all time. Their server also might
> be down. There are plenty of reasons to remove dependency to any
> single party.
It is possible to start an open service, with mirrors. Interested people
can set their freerunners to send in good aiding data when they have it
(i.e. when using the gps and a network is available.)
Such a update gives away where you are, because the satellite
constellation is only seen from part of the world. But I believe this
part is large enough for privacy.
People using the service don't need to give away much. In an extreme
case they will download ephemeris data for _all_ satellites, and then do
the processing based on approximate location in the phone itself.
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