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Re: [gpsd-dev] [PATCH] Proofread the PPP doc.
From: |
Gary E. Miller |
Subject: |
Re: [gpsd-dev] [PATCH] Proofread the PPP doc. |
Date: |
Sat, 22 Dec 2018 14:59:44 -0800 |
Yo Sanjeev!
Partially applied to git head. GLONASS was intentionaly left enabled for
Javad GPS, so I did not apply that part. It is only u-blox that needs
GLONASS off for RINEX. CSRS-PPP happily takes the Javad GLONASS raw
data and uses it to improve the results.
On Sun, 23 Dec 2018 03:00:17 +0800
Sanjeev Gupta <address@hidden> wrote:
> ---
> www/ppp-howto.adoc | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/www/ppp-howto.adoc b/www/ppp-howto.adoc
> index e85e72f6..be496d3e 100644
> --- a/www/ppp-howto.adoc
> +++ b/www/ppp-howto.adoc
> @@ -68,7 +68,7 @@ spot?
>
> All GNSS systems compute positions using ECEF (earth-centered,
> earth-fixed) coordinates. After an ECEF position is calculated, it is
> -converted into latitude, longitude using a datum. So many to
> +converted into latitude and longitude using a datum. So many to
> choose from. You've probably heard of WGS84, NAD83, and maybe ITRF.
>
> NAD83 is pinned to the North American tectonic plate. WGS84 is pinned
> @@ -96,7 +96,7 @@ Original ITRF and WGS84 differ by less than 1
> meter, which is huge for the purposes here. ITRF2014 and WGS84(G1762)
> differ by a few centimeters.
>
> -It gets worse. two expensive GPS often differ in altitude by over 60
> +It gets worse. Two expensive GPS often differ in altitude by over 60
> feet. Altitude is calculated as height above Mean Sea Level (MSL).
> But the Earth is not a perfect sphere. It is more pear shaped. In
> addition gravitational anomalies affect 'sea level'.
> @@ -145,7 +145,7 @@ There are many possible adjustments to the above
> procedure.
> Maybe you want to collect just 10 minutes of data to verify that your
> tool-chain is working before doing a 24 hour run. Simple, just change
> -`gpsprof -n 86400` to `gpsprof -n 360` and then proceed as above.
> +`gpsprof -n 86400` to `gpsprof -n 600` and then proceed as above.
>
> Maybe your _gpsd_ host does not have Python installed. Just run
> _gpsprof_ remotely. On the host you will need to run _gpsd_ with the
> `-g` parameter so @@ -295,16 +295,17 @@ and QZSS:
> ...................................
> $ zerk -d COMPASS
> $ zerk -d GALILEO
> +$ zerk -d GLONASS
> $ zerk -d SBAS
> $ zerk -e GPS
> ...................................
>
> -Verify that only GPS and QZSS are enabled:
> +Verify that only GPS and (possibly) QZSS are enabled:
>
> ...................................
> $ zerk -p CONS
> zerk: poll CONS
> -RE:
> %cons%/par/pos/sys={gps=y,glo=y,gal=n,sbas=n,qzss=n,comp=n,irnss=n}
> +RE:
> %cons%/par/pos/sys={gps=y,glo=n,gal=n,sbas=n,qzss=n,comp=n,irnss=n}
> ...................................
> Verify raw data messages are being sent:
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
address@hidden Tel:+1 541 382 8588
Veritas liberabit vos. -- Quid est veritas?
"If you can’t measure it, you can’t improve it." - Lord Kelvin
pgpoqvTpVjEur.pgp
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