[Loadstone] "bluetooht, supported, internal"?
rob at loadstone-gps.com
Wed Oct 1 09:33:12 BST 2008
Assisted GPS (A-GPS) - Wikipedia
Conventional GPS has difficulty providing reliable positions in poor signal
conditions. For example when surrounded by tall buildings (resulting in
multipath), or when the satellite signals are weakened when a GPS device is
indoors or under trees. Some newer receivers are better at handling these
In addition, when first turned on in these conditions, some non-assisted
GPS units may not be able to download the almanac and ephemeris information
from the GPS satellites, rendering them unable to function until a clear
signal can be received continuously for up to one minute.
An A-GPS receiver can address these problems in several ways, using an
* The assistance server can locate the phone roughly by which cell site it
is connected to on the cellular network.
* The assistance server has a good satellite signal, and lots of
computation power, so it can compare fragmentary signals relayed to it by
cell phones, with the satellite signal it receives directly, and then
inform the cell phone or emergency services of the cell phone's position.
* It can supply orbital data for the GPS satellites to the cell phone,
enabling the cell phone to lock to the satellites when it otherwise could
not, and autonomously calculate its position.
* By having accurate, surveyed coordinates for the cell site towers, it can
have better knowledge of ionospheric conditions and other errors affecting
the GPS signal than the cell phone alone, enabling more precise calculation
As an additional benefit, it can reduce both the amount of CPU and
programming required for a GPS phone by offloading most of the work onto
the assistance server.
A typical A-GPS-enabled cell phone will use an internet connection to
contact the assistance server. Alternatively, it may use standard
which is slower and less accurate, but does not lead to network charges for
data traffic, which can be considerable.
At 10/1/2008, you wrote:
> > Assisted gps is the internal receiver assisted with data from a
> > server.
>So this has no meaning for LS, I think? And I would have to activate
>just "internel" if I ever want to use it?
>Loadstone V. 0.70, Nokia N70
>Loadstone mailing list
>Loadstone at loadstone-gps.com
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