[gps-talkusers] FW: How does the receiver search for satellites?

From: "Chip Orange" <Corange@xxxxxxxxxxxxxxx>
To: <gps-talkusers@xxxxxxxxxxxxx>
Date: Thu, 20 May 2004 14:37:53 -0400
Well Peggy,

They don't actually send out any signal; think of them more as tuning up
and down the radio dial, listening for each satellite to report its
information.  The newer receivers usually have 12 receivers (channels)
so they can listen for 12 satellites at once (that's one thing that
makes ones like the EarthMate so much faster at aquiring a signal than
older receivers).

Not the earthmate, but some receivers would try to cut this time down by
remembering where they last were, calculating which satellites should
therefore be overhead just now if they're still in the same position as
they were when they were last turned on,  and then listening for those
satellites first.  The earthmate is so quick that it doesn't need to do
that, so it doesn't matter how long you've had it turned off.

Hth,

Chip

-----Original Message-----
From: Peggy Kern [mailto:kernsac@xxxxxxxxxxxxx]=20
Sent: Friday, April 16, 2004 12:12 AM
To: GPS-TalkUsers@xxxxxxxxxx
Subject: How does the receiver search for satellites?

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Hi, guys.  As I was riding to choir rehearsal tonight, hoping for a fix
which I never got (I sound like a drug addict, don't I?), I started to
wonder exactly how our receivers search for satellites.  Is there some
orderly method they go through?  Do they first send a signal or whatever
they send up to the last remembered position, and then gradually move
out in first one direction, then another, etc?  Why don't they find
fixes sometimes?  Does it mean there are no satellites in the area (how
far away do they look?), or that there's something that prevents them
from finding a fix, or what?  I wish I could see all the interaction
that goes on between our receivers and the satellites and know more
about what's involved in getting a fix.  But in the meantime, I love
doing my 1960's hippie druggie imitation, and say over and over to my
husband, "I need a fix, man."  <lol>

Peggy



mailto:kernsac@xxxxxxxxxxxxx
http://www.home.earthlink.net/~kernsac
MSN Messenger kernsac@xxxxxxxxxxxxx

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[gps-talkusers] FW: How does the receiver search for satellites?

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