Fwd: Satellite 26

forgot to reply to list


---------- Forwarded message ----------
From: Henry Hallam <[email protected]>
Date: Sat, Aug 14, 2010 at 3:43 PM
Subject: Re: [OpenSource_GPS] Satellite 26
To: "[email protected]" <[email protected]>


Thanks!

My (DIY) carrier-phase DGPS system was generating rapidly varying
corrections for that satellite, several meters in magnitude. =A0It got
better later on in the day. =A0I think it might have been a multipath
issue because the satellite had a low elevation at the time (and there
are a lot of trees nearby) but I'm surprised at the magnitude since
I'm doing carrier rather than code phase operation. =A0I do use code
phase measurements for the satellite position calculation so maybe
code-phase multipath affected that. =A0Unfortunately I wasn't taking
high-rate logs at the time.

I guess it could also be a bad ephemeris, or bug in my software!

PRN25 is actually recently launched, still in the checkout phase and
should be marked healthy next month.

Henry

On Sat, Aug 14, 2010 at 3:29 PM, [email protected]
<[email protected]> wrote:
>
> I know this is a bit late but didn't notice a problem
> yesterday, but might not have been looking at the
> right time. You can check the FAA WAAS site for the
> health of all satellites it's not always 100%
> accurate but it's a good indicator.
>
> http://www.nstb.tc.faa.gov/RT_WaasSatelliteStatus.htm
>
> Satellite 25 has been iffy for a couple of months and
> satellite 1 is just a no hoper.
>
> The Coast Guard web site should detail any outages
> planned or otherwise.
>
> http://www.navcen.uscg.gov/
>
> I sometimes just pickup an ephemeris incorrectly but
> that clears when the next even hour comes around.
> What exactly did you mean by issues.
>
> cheers
>
> Mark
>
>
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>>Subject : RE: opensource_gps Digest, Vol 64, Issue 1
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 13 Aug 2010 12:41:29 -0700
>
>
> Is anyone else having issues with satellite 26 at the
> moment?
>
> Thanks
> Henry
>
>
>
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--
Henry Hallam

Sent from my Laptop



-- =

Henry Hallam

Sent from my Laptop