search

schollz / find3

High-precision indoor positioning framework, version 3.
https://www.internalpositioning.com/doc
MIT License
4.63k stars 363 forks source link

Question on RSSI impact on accuracy? #199

Open IoTThinks opened 4 years ago

IoTThinks commented 4 years ago

Hi all, Thanks for the awesome project. I understand that the RSSI will be taken into consideration for machine learning.

In this URL https://www.internalpositioning.com/doc/faq.md#minimum, it is mentioned that the graphs are "similar". And "This indicates that these two places are probably too close together."

For a layman, these graphs are actually not similar to me. They are similar with the same detected access points (SSID / BSSID) However, the RSSI and power are different?

Hence, in this case, the system "should" differentiate the locations of the two graphs, right? Any advice is appreciated. Thanks a lot.

image

schollz commented 4 years ago

Those two graphs are pretty similar. Yellow, red and blue are all overlapping the same regions with small shifts. Only green is very different, but not by much.

IoTThinks commented 4 years ago

@schollz Yes, you are right. If we only consider the X-axis then yellow, red and blue are quite the same in two graphs.

BTW what is the unit of the Y-axis? The values of Y-axis are different. Hence, the "shapes" in two graphs are different. Except the yellow graph, the rest have different shape in two graphs.

Thanks a lot for replying me. :)