[gps-talkusers] FW: More Earthmate ponderings
- From: "Chip Orange" <Corange@xxxxxxxxxxxxxxx>
- To: <gps-talkusers@xxxxxxxxxxxxx>
- Date: Thu, 20 May 2004 14:16:14 -0400
Good theory; but I'm afraid that's not how WAAS works. It doesn't get
any positional information from WAAS; what it gets may better be thought
of as hints; the hints say hey GPS receivers in the area of Chicago;
right now things are a little odd there so change your calculations by X
amount to come up with a better position.=20
Its not just the number of satellites you see at the moment that effect
your positional fix; it's how they are lined up relative to one another;
and what other electrical activity is taking place nearby. If there's
some source of RFI; that may do more than anything else to impeed you
from aquiring a fix. Or it could be that the satellite you need is just
behind that tree or house at the moment.
Hth
Chip Orange=20
-----Original Message-----
From: Mary Ellen Earls [mailto:meearls@xxxxxxx]=20
Sent: Thursday, April 01, 2004 6:09 AM
To: GPS-TalkUsers@xxxxxxxxxx
Subject: Re: More Earthmate ponderings
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Well, I can tell you that the weather doesn't have as much affect as you
may at first believe.
When I first got my gps-talk on the laptop we had all kinds of goofy
signals out of that thing and I thought it wouldn't track in cloudy
weather but, with the Braille Note and the Trekker, tthis has not been
the case.
I have had the unexplainable experience of being out on a warm sunny day
with no clouds anywhere and the gps reading poor, 3 satellites and maybe
3 days later just as the skies were about to burst with rain having that
same receiver give me a very good, 8 satellites reading.
I would imagine it depends more upon where those little satellites are
in relationship to where we are, and the time of day that dictates the
readings we get.
Perhaps, and Mike can clarify, perhaps this is why they have switched to
the receivers with the Waas readings so the receivers would have at
least 2 stationary satellites from which to pick up a signal.
Mary Ellen Earls
----- Original Message -----
From: "Lisa Kozlik" <lisak70@xxxxxxxxx>
To: <GPS-TalkUsers@xxxxxxxxxx>
Sent: Wednesday, March 31, 2004 11:39 PM
Subject: Re: More Earthmate ponderings
> =
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>
> Chris,
>
> I'm not *completely* certain that time of day makes a difference in=20
> the receiver's ability to track a signal. However, my experience has=20
> been that tracking takes place much faster at night when the sky is=20
> clear. I also
get
> faster tracking results on days when it's mostly sunny as opposed to
mostly
> cloudy. Now that I think of it, I remember reading a few articles on=20
> the
Net
> about the weather and how it impacts tracking ability. If I can find=20
> any
of
> these articles, I'll post them to the list. If anyone knows for sure
whether
> tracking is indeed affected by weather, I'd be interested in hearing=20
> your thoughts.
>
> Lisa
>
>
> =
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