LV_Forestry Posted at 3-14 22:42
35 minutes of observations to do the PPP seems a bit short to me. Did you try to make a 35 minutes observation and a longer one without moving the antenna? To see if there is a big difference.

From experience doing OBS this short, you shouldn't expect anything better than +/- 15cm.

The antenna should not be moved. This are some reports with drtk2.
The last one is not DRTK2, is a reference station with 2 hours obs. This antenna station only record GPS and GLONASS instead of DRTK2 that add Galileo and Beidu.




NOT DRTK2:

Guille_Meinero Posted at 3-15 04:05
The antenna should not be moved. This are some reports with drtk2.
The last one is not DRTK2, is a reference station with 2 hours obs. This antenna station only record GPS and GLONASS instead of DRTK2 that add Galileo and Beidu.
[view_image]

Made a mistake pointing sigma (errors).... should be the last three ones

LV_Forestry Posted at 3-14 22:42
35 minutes of observations to do the PPP seems a bit short to me. Did you try to make a 35 minutes observation and a longer one without moving the antenna? To see if there is a big difference.

From experience doing OBS this short, you shouldn't expect anything better than +/- 15cm.

Trimble's RTX uses global reference station network, but i could't find where they are... so i think error (or observation time) may vary according to where you are.
They recommend 1h of observations

LV_Forestry Posted at 3-14 22:42
35 minutes of observations to do the PPP seems a bit short to me. Did you try to make a 35 minutes observation and a longer one without moving the antenna? To see if there is a big difference.

From experience doing OBS this short, you shouldn't expect anything better than +/- 15cm.

sorry i didn't understand you.... by "not moving" you mean to make comparison... no, i dont have that kinf of files.... BUT, what you can do test it is to cut a 1hour rinex observation file and make a test

Thanks for sharing all this info, it is always interesting and useful to learn how other folks are using this gear!

Guille_Meinero Posted at 3-15 04:30
sorry i didn't understand you.... by "not moving" you mean to make comparison... no, i dont have that kinf of files.... BUT, what you can do test it is to cut a 1hour rinex observation file and make a test
[view_image]

I will try tomorrow on a known geodetic landmark. I'm going to let the antenna record few hours, at least 4, and split the file as you suggest.

patiam Posted at 3-15 10:41
Thanks for sharing all this info, it is always interesting and useful to learn how other folks are using this gear!

Yes, Thanks to everyone for helping me out. Im a newbie and I always have questions. All of you guys have been great! I enjoy reading all the knowledge you write about this.

LV_Forestry Posted at 3-15 11:15
I will try tomorrow on a known geodetic landmark. I'm going to let the antenna record few hours, at least 4, and split the file as you suggest.

remember to share with us your results!

Guille_Meinero Posted at 3-16 12:03
remember to share with us your results!

I will not miss it. I didn't have a chance to make a big OBS file today. I had to move the antenna. Tomorrow it should be done.

Guille_Meinero Posted at 3-16 12:03
remember to share with us your results!

I tested with Trimble's PPP service. Check the coordinate system used. For me it is not good at all. And I just noticed that in the reports you shared, it's never the same.

For a two hour survey, Trimble gives me excellent results like yours. But the fact is that the actual point is far from the tolerance. This is because of the coordinate system. It will be necessary to be able to choose ITRF20.