Control profile
- Thread starter Michael
- Start date
I would use my standard boundary profile but extend the time so each shot would be a minimum of 10 minutes and would rotate the rod 90° each shot and get a total of 4 shots on each control point. I would then run cluster average on all control.
I would with RTPK but I want to eliminate pole centering issues by rotating the pole and averaging. Plus I like being able to review and analyze data on the LS.
Ok. I created an action profile called "Control". I did this by Copy As in General group. (1) In the how to stop it shows After 10 epochs as on. (2) Min RTk time span 180 sec as on. (3) Stop survey when Rtpk solution is verified is on. (4) Stop survey when signals variety is reached is on. I know I need to set the maximum total duration to 600 seconds, Does Minimum need to be 10 seconds? As for the other 4 settings I mentioned how should they be set? Also there has been discussion about RTPK or DPOS, does this figure in the settings. Thanks Mike
For those types of shots I would probably set it to stop with the stop button, I may let it cook while i'm doing other things. Maybe a nap in the truck on a dreary day like today while it's working?
10 minutes times 4 seems way too long to me. I'd consider doing two 4 minute observations.
It is a long time and is probably overkill but has yielded excellent results.
Nate The Surveyor
Well-Known Member
If high accuracy is critical, I'd consider constellation configuration. I know we have 20 to 38 sats up there, but satellites are not all equal. Do 3 - 4 minute observations, starting early in the morning, and avoid the afternoon doldrum hole around 2 to 3.
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Alright. Did the 10 min rotate pole 4 quadrant processed rtpk. Two known NGS monuments I have done just recently. Averaged the shots on one and it was .03' vertical to published. Previous on this was around .08' vertical. Not bad. Averaged second ,17' vertical off published. Previous was about .03' vertical. Both of the sessions were RTPK with 10 min on each and rod rotated. Would copy the points in a renamed project nd DEPOS them (I know you lose RTPK if you DPOS the points) be a check to see why the .17' is showing on the second control is so far off or what are you guys thought. Vertical is what I am concerned with here and knowing how to deal with it in the future.
Are the clamps tight on your monopole? Look at the screen shots to double check the ant height too.
Adam. Checked screen shot and height correct. Did not use monopole used regular rod through out to keep that out of play. Base was at 8.2 miles. Same setup that was used the previous time I tied into this control (base at house ) That time I just used standard boundary profile with verification you set up. Better vertical results less time. Previous vertical were +.00', +.13', +.04', +.03' and +.02'. on BR2A. This time with longer duration +.12', +.19', +.17' and +.17' on BR2A. Previous on other monument BR2 +.14', +.08', +.08', +.06' and +.10' using regular boundary profile RTPK. This time BR2 longer time +.02', +.01', +.04', +.09' and +.09'. Not bad. Is using the longer time and RTPK the problem or do I need to rethink how I do this? Mike
Jim Frame
Well-Known Member
At that distance your results all look pretty good to me. That's near the allowable range for height modernization surveys according to NGS guidelines. I've done more than a few of those, and have seen 1-hour L1-fixed vectors taken taken with a constellation change (1 day + 3-hours separation) show as much as 0.40' difference. (Most are in the 0.05' zone though.)
I don't think you can reasonably expect short-duration observations to get tight verticals with vectors that long.
So, say I was doing this 8.2 miles. How do you do a static session with the T-3 and LS+ and your suggestion for time duration. DEPOS or OPUS ?
I am attaching 2 PDF's to try to show my confusion on this. The 10 minute rtpk PDF is my recent results with new base at the house. The regular boundary rtpk PDF is at the house several weeks back on a different base. Essentially the same distance to each of the two GPS monuments (about 8.5 miles). As you can see, I got better results with the regular boundary profile and shorter duration shots than the longer duration 10 minute sessions. Just trying to setup a procedure to bring elevations into site with consistency. Since the base has been DPOS with about 5.5 hours of run time, is it the same as long duration static session and used as simply control monument? any comments or reply's appreciated. Mike
