I lost fix one on of my rovers and am not sure why. This is the first time using RTKLib Plot so if I can provide additional information let me know. I post processed the base and rovers files so I believe this is PP an not live data. I might be mistaken as the age of differential goes high which I’m assuming can’t happen with PP.
Keep in mind that a loss of fix can be attributed to the LoRa connection as well. I have seen High-Voltage transmission lines cut radio reception distance from 2 miles down to 500ft which is independent of how many usable satellites you have.
I might be missing something but with having post processed the base and rover logs doesn’t that eliminate Lora as the problem? I’ll admit I struggle a little bit to understand which plots are from the raw data and which plots are from the post processed signal so if what I’m saying doesn’t make sense that is likely why.
The machine was traveling along and the signal degraded to Float and then Single. We stop if it degrades from Fix. Nothing noticeable happened at the base.
Any clue why it would have stopped logging and sending out corrections over Lora?
The rovers are used for guidance on an ag tractor. 2 rovers for precise heading connected over RS232. All communicating over Lora to a base at the middle of the field. Base is permanently powered.
I can check the base and make sure the log didn’t roll over and it is in the next one. Does rolling over from 1 log to another take time and cause the receiver to stop sending corrections? I thought I grabbed the log from the base that included this time frame but I may have been off by one. I will check tomorrow morning.
It is rare but occasionally the base isn’t sending anything over Lora and I have to reboot it or change the corrections to another output, apply, change back to Lora, and apply in order to get it to send data over Lora again. Not sure if this might be related to that or not.
Rover 1 experienced a drop in satellites. Is that just the number of used satellites for RTK or visible satellites? The sat visible plot doesn’t appear to corroborate the lack of satellites. Note it was rebooted to try and fix the problem.
At the moment, the data we have seems rather fragmented so it’s difficult to see the cause of the issue here. I’m afraid I might have missed some information. To structure this, I’d ask you to provide the additional information to me:
position log from both rovers and base correction log
full raw data log from the base. The .obs file on the last screenshot goes from 18:00 to 02:00, but the base log that you provided ends on 22:00
raw data log from the Rover 1. In the second link, there are only the logs from the Rover 2
Could you please specify the installed firmware version on all the receivers? Also, please describe the hardware setup of the base.
All of this information will help me to examine what causes these issues.
The logging does not affect the satellite reception. Once you stop logging, the base should still be able to transmit corrections as these processes are not connected directly.
The screenshot shows the number of valid satellites observed by the receiver during the PPK survey. As you have mentioned, you merged two logs so that this drop can be a cause of the log absence on this time interval.
Here is a link to all the ubx, llh, and base correction files.
The base is running 2.18.1. I’ve tried to update it but it hangs. I likely need to flash it manually but it isn’t easily physically accessible because it is up on a pole. It is about 8 feet above everything else in the area and is permanently powered.
Yes…is there anything from the logs that indicates why? I’m interested in understanding the root cause or a specific bug that was fixed. While I can upgrade it doesn’t help identify the root cause unless a specific bug was fixed that was causing the problem. Upgrading simply kicks the can down the road until I’m able to reproduce it.
I believe this is when the Rover 1 was being rebooted to try and get it to re obtain the fix.
At this point, it’s quite tricky to determine what has led to these RTK results. We recommend updating the firmware to the last stable as to eliminate the issues with the future surveying. As I’ve mentioned earlier, this update brings improvements in overall stability and fixed issues with Fix re-obtaining.