By the way move your 900 MHz antenna to the other side of the post. Any object containing moisture will absorb the signal energy

@GardeninginNorth

Ай бұрын

Thank you for your comment! Good point! I`ll see if there is a difference, when I take myself together and start working on improving my EPOS signal quality! I have tried to better secure the antenna to the module again, and the signal strength under the antenna (in charging station) improved up to 94%. However, this was a peak, as the signal strength is fluctuating between 46 and 94 % now. I have started to think, that maybe the problem is very simple, and my signal reference station just has a faulty hardware... I`ll keep you guys posted! Thanks again for thinking along!

The "points" you refer to is a Signal-To-Noise ratio (SNR). So for example 30 means 30% of the signal is good, and the rest of it is bad (noise). As long as it is above some threshold, then you can get an accurate position, but if you are close to that threshold only a few "points" less will mean you can't navigate accurately with the available satellites. You can see the colors go from green to yellow to red on the scale. I am not sure if I understood you correctly, but it is not enough to have only signal from the reference station to the mower (your ~900 mhz signal). The mower also needs to see the satellites itself, and it's the number of satellites that are seen simultaneously by both the mower and the reference station (co-viewing) that matters. It's not enough that the mower sees 20 satellites, and the reference station sees 20 satellites, if those aren't the same actual satellites in space. To be able to use a satellite, both the mower and the reference station need to see it, and the correction data from the reference station for that satellite needs to be able to transmit from the reference station to the mower without errors. You probably knew this already, but I just wanted to emphasize it just in case. If you have a lot of tree cover, then RTK (EPOS)-based GPS mowers will struggle without some additional form of navigation. As you say the robot is slipping a lot, then odometry (counting the turns of the wheels) may not be enough, and there is no camera or lidar system to use for navigation on that model, AFAIK.

@GardeninginNorth

Ай бұрын

Hi, and thank you so much for your explanations!! I`m only able to have an opinion about the SNR if it is expressed in dB-s and exactly - know both the SNR and receiver sensitivity thresholds. I think the whole idea was to make it easier to understand for the end user, but I`m struggling here a bit to interpret these simplified percentages... The manual does not explain this either... So if you have any information about the thresholds that you can share, I`d be so thankful! Great hint with the satellite visibility, too! Thank you so much! I did not make that comparison yet, if they see the same satellites, or not! The reference station is installed in the middle of an open area, so that should see more or less all the satellites, which is definitely not the case for the mower. I`ll do that comparison soon and include the takeaways in the last follow-up video after the mowing season is over. Regards to slipping, I`ve created some additional stay-out zones, and that seems to help. I was not sure if that was required around the tree trunks, but now that the zones are there, it seems so much better! Yesterday was the first day of operation without any errors at all! This is awesome! :) But I`m losing hope of covering the beach access area with this mower a bit... But let`s see. Perhaps raising the reference station works (or getting it checked by the maintenance people)... :) Thank you to everyone for thinking along and sharing your ideas on how to improve the situation!! I am very thankful!

KGB internal records show the little man has a little man himself. Napoleon had the same issue. By the way his little thing may be on sale for $100k

I would suggest try to get the antenna higher as a first effort. Be sure to let support know the issues you are having too. Don't underestimate a possible defective reference station. I have had many time where switches, routers and such were defective out of the box which drove me crazy with trying to figure out why things were not connecting. I also wonder about the possibility of GPS interference effecting you as another commentor stated.

@GardeninginNorth

Ай бұрын

Hi, and thank you so much for your comment! Rising the antenna is definitely the first thing to approach for me! And although I do not like complaining, I indeed need to let the seller know about the problem, specially, as the signal strength varies highly even below the antenna. I keep my fingers crossed, that the problem would not be the GPS interference, as that would probably qualify under force major and I can not do too much to improve it.... :/

I think it's a little man with a major complex that is interrupting your GPS signal. Hitler would have done the same if the technology was available.