LS Interference Scan

Hej, still learning about the LS and its functions. o_O:)

This summer I had a spot where the LS lost the connection to its (T-2) base. The radio link was still up and running but no corrections were recieved / satellite reception was lost. This spot is at completely open sky. After re-starting the LS all was fine again. This happened several times at the same location. We have geomagnetic imagery from the spot and it shows a anomality in the area. I did a interference scan with the LS, but I have trouble interpreting it, as I do not really know what all the information means.

I attach the screenshots here and would be very thankful if someone could give me a short explanantion or could point me towards some information how to read these charts.

20211011-08.49.02_00974_GPSL1_1.png


All screenshots here: https://my.hidrive.com/share/a6f16s.gt6

Thanks a lot and best greetings!
Felix
 
Nobody has any idea or can point me to a resource where I can find more information how to read the interference scan? :(

Thanks!
F
 

Shawn Billings - Javad

Active Member
JAVAD GNSS
I don't remember seeing this post.

20211011-08.49.02_00974_GPSL1_1.png


1. This is the space between the antenna filters that allow the antenna to receive signal input. Beyond these filters, signals are mechanically prevented from reaching the antenna.

2. 2 interferences from external sources

3. Electronic "counter-measures" applied by the software to deal with the interference.

4. (Not numbered on the image) sloping line: appoximate shape of line that should appear without interference.

From my experience, this site was definitely experiencing interference in the L1 spectrum.
 
Thanks to both of you for the feedback and for the detailed explanation, Shawn!

I think I understand better now, but I still have a few questions:
- Is there a difference between "punctual" deflections like the center peak and "wider" areas of interference?
- Could this kind of interference damage the devices?
- Its a common behaviour, that the LS "shuts down" in a case like this?
- and last but not least, what are possible sources / reasons that might cause a interference (like this)? Is it dangerous? :)

Thank you again for sharing your knowledge, it`s highly appreciated!
 

Nate The Surveyor

Well-Known Member
I was near a cell tower. I needed a shot on a fence corner. I had loads of signal. Walked to fence cor. No signal. I walked away, signal came back.
Some places may HAVE to be post processed. Due to interference, from high rf locations.
Also, don't put your base on a mountain, near a cell tower. Just a waste of time.
N
 

Phillip Lancaster

Active Member
I was near a cell tower. I needed a shot on a fence corner. I had loads of signal. Walked to fence cor. No signal. I walked away, signal came back.
Some places may HAVE to be post processed. Due to interference, from high rf locations.
Also, don't put your base on a mountain, near a cell tower. Just a waste of time.
N
Nate. Cell connection will push better than UHF in those situations.
 
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