I spent 45 mins + the other day, trying to get a good shot

#1
There were trees. But not so bad that it should have stopped for that long.
I finally stored a gimpy shot, and moved along. It was not a very critical shot. Snow man said it was time to move on. (Snow Man is the son I had with me. He likes Snow)
So, I did. It began running fine. Then, another woods shot, Worse than the one it refused. I remembered to RESET TRACKING. BOOM! we are on like donkey kong!
Then, I discussed it with Shawn Billings, and he said that woods work included pressing "RESET TRACKING" when things are not moving along, as expected.

1.) What does "Reset Tracking" mean?

2.) Do any of you other users do this?

3.) What is happening in the unit, that leads to this condition?

Looking for info.....

Thanks!

Nate
 

Matt Johnson

Well-Known Member
5PLS
#2
Reset Tracking resets the tracking procedure of the satellites. It should happen automatically if the RTK engines do not fix for 120 seconds. The setting is in Setup>Advanced>RTK/DGPS:

RTK-DGPS Settings_20151127-03.18.35.png


Were the RTK engines not fixing for you or were they fixing but many different groups being created during Phase 1 of RTK Verification and it was not advancing to Phase 2?
 
#3
For sure... it is set just like above. It would cook a few coords, and even made it to 50 or so, and then threw it all out. I did not know that setting was there. So, maybe it was something else? Will it reset tracking every 2 mins with that setting?
Does that 120 sec reset happen just once, or continually?
N
 

Michael Stazhkov

Developer
Staff member
5PLS
#4
Dear Nate,
"Reset Tracking after" should reset tracking if RTK is working (has stable float solution) and there are no fixed solutions during required period of time. It will reset continually.
But in your case I see another situation there were some fixed solutions during 120 sec but the solutions was thrown away (the position jump detected).
 

Matt Johnson

Well-Known Member
5PLS
#6
Michael, I had my LS setup in an open area overnight collecting points for test data last night. This morning I noticed that only 4 of the 6 engines were fixing but after resetting tracking all 6 fixed. Are there any other more advanced ideas for algorithms that could detect when the tracking needs to be reset?
 

Shawn Billings

Shawn Billings
5PLS
#7
The more I think about this, I still think reset tracking would be the way to go in this situation, Nate.

If the receiver gets any fix at all, then the automatic reset tracking will not occur. It only happens if there is no fix for 120 seconds (or however long you have specified). So if you are getting any fix at all, it will cause the receiver to wait for 2 more minutes before possibly resetting the tracking.


There are times the engines need the refresh that reset tracking produces. Remember, as we discussed, reset tracking is identical to unplugging the GNSS antenna from the receiver. It forces the receiver to reacquire satellites again from scratch. This often gives the engines a needed refresh, particularly when working in canopy. When should you do a refresh tracking? With the current GNSS firmware, I find that going from one environment to another tends to require a tracking reset. So, going from open areas to areas under canopy, or from an area under canopy to the open, or going from one place under canopy to another place under canopy. Having used the receiver for a while, I have an idea of what to expect from it. If the receiver is delivering performance in an area that I expect it should perform under, I hit reset tracking.
 

Michael Stazhkov

Developer
Staff member
5PLS
#8
I agree that to invent some algorithm for automatic reset tracking is better than to do it manually each time. We need to think about "more advanced ideas".
 
#11
Shawn I agree.
I have found that resetting tracking works well when walking through woods and different terrain changes in elevation etc. from one shot to another.
My thinking is/was in that type of environment there will be different satellites that go out of view and new ones that come into view
even though the shots are only separated by potentially hundreds of feet.
The receiver seems to get stuck trying to track satellites from the last location that may not be optimal at the new location.
In the open it is not an issue.
 

Adam

Well-Known Member
5PLS
#12
Can reset tracking be added to the white button options?


Scratch that I didn't realize it is on the v6 engine screen.
 
Last edited:

Matt Johnson

Well-Known Member
5PLS
#13
I agree that to invent some algorithm for automatic reset tracking is better than to do it manually each time. We need to think about "more advanced ideas".
I noticed the same problem again that I saw this morning, engine 3 and 5 would not fix until tracking was reset:

RTK-V6-PLUSS_20151127-20.37.09.png


Maybe tracking should automatically be reset if any of the engines remain stuck with a float solution for the specified time period.
 
#15
I had another situation, the other day.
I got a warning "high interference" or the like. Only one engine would barely fix. Nothing.
I called Shawn. He said to press the "reset tracking" (next door to reset Rtk".
I did, and it finally came back.
What was odd, was there were 2 places on this job, where it would not work well. Like some sort of GPS fuzz or interference was shutting me down.
It just seemed odd.
I've been told that some places near cell towers will do this too.

I guess I'm curious about others experiences, where rtk is not doable, due to interference.
 

Matthew D. Sibole

Well-Known Member
5PLS
#16
I was working on a site a month or so ago where while I was standing under a large power line it would keep going in and out of fix. Wide open sky, no trees for probably 800'. Right next to Interstate 65.

Worked great everywhere else. I did end up getting the shot but it took me significantly longer than I expected.
 

Sean Joyce

Active Member
#17
upload_2016-3-7_15-21-32.png

The turbines in Dave Simolo's back yard caused interference but didn't really affect the shots in this very open area.
When John Evers delivered new equipment to Larson and Simolo I drove up for some refresher training.
John took a peak at the interference analyzer and it showed (correct me if I'm wrong John) a patterned spike in the interference that seemed to coincide with the rotating blades, which really illustrated the capability of the L.S.
 

Sean Joyce

Active Member
#18
The only real big problem area that I have noticed is when the receiver is right next to a large tree, pole, building etc. (a bad spot for GPS) which can result in waiting a while for the constellation to change to get the shot.