hi
I found reference to an article in the blog where researchers used LPS system in area of approx 7x14m divided into 4 rooms, using only 6 anchors.
https://www.bitcraze.io/2019/02/using-t ... d-mapping/
i'm planning to buy the LPS but could not find reference to answer -
- how can I know the number of anchors for such an area (and layout) that can still achieve +-10cm accuracy most of the time? at lease in xy plane
- is there a maximum number of anchors? i saw reference to 8 anchors as recommended maximum.
reference articles i found with Decawave chip - 5 anchors over large area. 90% of values have under 25cm error.
https://ieeexplore.ieee.org/abstract/document/7377440
thanks
number of anchors needed
Re: number of anchors needed
There are many ifs and buts when it comes to the number of anchors. If you run TWR mode like in the article you are referring two, 6 anchors will get you pretty far but then you are limited to one Crazyflie (or possibly more if you run TWR-TDMA). If you run TDoA (basically unlimited amount of crazyflies) we recommend at least 8 anchors, but now accuracy is more sensitive in regard to how you place your anchors.
Re: number of anchors needed
thank you for the reply tobias. I researched the topic but missed the part about accuracy. Now I read it again. I would love if you had some more details , even for a test case. the documentation refers to a room about 3*6 meters in size, 2.6 meters height. what accuracy can I expect in this case with 6, 8 anchors? what does it mean that tdoa mode is more sensitive to anchor positioning than twr mode? how accurate do I need to know the position of the anchor to get reasonable results?
anyway I will buy one set with 8 anchors and try to report back with accuracy data...
regrads
anyway I will buy one set with 8 anchors and try to report back with accuracy data...
regrads