[hafqa] [hafqa] [Bug 2878] Very poor satellite acquisition with internal GPS

[From: bugzilla-daemon at maemo.org]

https://bugs.maemo.org/show_bug.cgi?id=2878





------- Comment #5 from advax at triumf.ca  2008-04-24 21:58 GMT+3 -------
tz writes "I have no information on the TI chip itself"

See focus.ti.com/pdfs/wtbu/ti_navilink_4_gps5300.pdf
Just a 2-page product bulletin, which says "..enables a rapid TTFF from weak
satellite signals exceeding the A-GPS requirements for 3GPP..".
The part (and I presume proper documentation) is only available to industrial
customers that want millions of the things.
Since the idea is to meet the E911 requirements (in the US) to send a position
with emergency calls from a cellphone, I presume it is supposed to get a fix in 
a few seconds with AGPS (AFAIK, a rough fix from the cell tower.

Comparison with my Garmin GPSMap76 (7 year old design, internal antenna):
N810   GPSMAP76
176sec 48sec (first fix in several days, as per Garmin spec.)
126sec 35sec (first fix in 2 days)
33sec  16sec (2 minutes later)
30sec  13sec (2 minutes later)

The N810 can keep a fix from a weaker signal than the Garmin, e.g. indoors,
once it's got it.


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