Hi Springfield:
PPP requires long observation times in the order of hours and therefore
a new field survey. I would try post processing from a high precision
site with your existing data.
Another issue may be the aviation antennae you mentioned. These are
usually mounted on the top of a fuselage and therefore the aluminum acts
as a ground plane to effectively filter out multipath. If you use a
metal disk or plate and a ground plane on your antennae and mount it on
a tripod, you may find you end up with better results. You will notice
survey grade antennae's have a large diameter plastic case since the
contain an internal 10 cm metal disk.
Kirk Schmidt
On 3/9/2021 1:36 PM, Springfield Harrison wrote:
Hello Garth,
Thanks very much for that reference. I have used the service in the
past.
I'm in the middle of other work but may try to re-process some Map A
files using PPP to see what changes.
Your work sounds more like surveying than mapping, interesting.
I do use the GPS reception planning tools but SV availability is
certainly better than in the early days.
Thanks again . . . .
-----
Cheers, Spring
On 09/Mar/2021 09:01, Garth Fletcher wrote:
Nicolas Cadieux wrote:
Kirk could be on the right track. You could try PPP using this
site. You will need to create a user name and password. Then, you
upload the Rinex file. I am 99% sure you can process point from
outside of Canada.
I routinely use CSRS PPP to post process RINEX files from Southern New
Hampshire (43°N, 72°W).
Using an iGage iG3s (L1/L2 dual frequency, GPS + GLONASS) recording at
5 second epochs in forested areas, from post processing I get
30 minute recordings, 95% error ellipses < 1 meter
10 hour recordings, 95% error ellipses < 2 cm
CSRS-PPP site is
<https://webapp.geod.nrcan.gc.ca/geod/tools-outils/ppp.php?locale=en>
enter your email address
select Static and which NAD 83 epoch you want, or ITRF
Submit a RINEX file (.zip compressing the file is encouraged)
they will email back a detailed report
You can submit for 1 of 3 levels of post processing
ultra-rapid : submit > 90 minutes after end of recording
rapid: submit > 24 hours after end of recording
final: submit ~ 3 weeks after end of recording
Major part of corrections are in ultra-rapid, the higher levels provide
further refinements.
FYI: Trimble provides occupation planning aids at
<https://www.gnssplanning.com/#/charts>
just enter your location and date and it shows you the DOP as
a function of the hour of day.
Cordially,
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--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: [email protected]
Web: www.nortekresources.com
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