Can anyone help?
I am working on a site that has leica, Top Con, Trimble RTK Base & Rover systems also have a leica network Rover running all have the same problem, we loose our fixed position for about 30 seconds simultaneously. Seems to happen every 10 minutes on the dot. The problem seems to be on the L2 Channel for example we will be locked onto 10 Satellites on L2 Channel and will see this drop to 0 for about 30 seconds This has been going on for about 2 weeks now prior to that we have had no problems on this site. I have not confirmed that this is a localized to my area but will setup one of the systems 50 miles away from the site today. I have turned Glonass off, as well as L2C and we still see same problem. We are running machine control therefore turning off L2 is not an option due to the accuracy requirements with elevation control. The site is approx 150 acres with no radio towers around and an open sky environment.
Any Suggestions, Many Thanks
Only thing that comes to my mind is a radio that is doing a clear to send or some thing similar in the area. With all those units, somebodies base radio is causing havoc. Even though it is clear skies, doesn't mean a radio signal is busting through. I know when I cue up my Motorola radio, my rover drops satellites. Got to step away to keep it from happening. Might just start one unit at a time or shut down one at a time and see who is the culprit.
I have done just that does not seem to make a difference seeing same problem, Also Network rover running off modem with same problem (no Radio)
Is there an airport nearby? Thats the only time I've seen that kind of thing happen.
Sorry, I didn't find it clear from the origional post, but are all rovers running off the same base?
If you could narrow it down to: 1) the base station is dropping satellites so all rovers are affected; vs 2) all rovers are dropping satellites even though the L2 corrections are reaching them from the base;
I think this would help trouble shoot the problem. Are you storing the raw data from the reference? This would be an easy way to check 1).
All rovers are dropping satellites even though the L2 corrections are reaching them from the base, not storing the raw data but will do that. great idea. Running multible Base stations on the job and one Network Rover.
1 Airport approx 10 miles away, everything has been working fine up until 2 weeks ago
Where you located at? I looked at the space weather and it looks like there is some activity, more so if you are fairly far north.
I've seen this happen before when the space weather was bad, but it seems like that was more than 10 years ago. I know it goes in cycles but I'm not sure if where we are at on the cycle.
You are close to an airport but when I had problems I was really close, within a mile.
What kind of airport? Military?
Any microwave towers nearby ? Could be scada telemetry or computer system batch sending data at regular intervals via microwave .
How sure are you that the L2 corrections are reaching the rovers? I am not too familiar with how this is indicated by most manufacturers. But could it be that L1 corrections are being received but no L2 corrections?
I guess what I am saying is that I find it really strange that multiple receivers from various manufacturers would loss all satellites at the same time. Usually geomagnetic activity wouldn't knock out all of your satellites, so I feel like it is more likely a problem related to the corrections coming from the base. But maybe I am misunderstanding... 🙂
The base radio may be transmitting the FCC ID once every 10 minutes. This might fill the channel, and a couple of messages might be lost. Which might kick off the L2.
Since it happens over several brands, I would concentrate on the base.
A quick try might be to raise the elevation mask, to reduce the SV count, just to see if it still happens.
Also, if you are doing RTCM2, try RTCM3 or CMR+ as they compress the messages better.
M
