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Distance function from RSSI

Determining distance given an RSSI value for use in multilateration

d:D
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Exploring the relationship between distance and signal to determine an equation that relates both in a way that plugging in an RSSI measurement would yield an estimate of the distance between the two radio modules. In practical applications, this would allow for multilateration with multiple radio modules and could be used to keep track of robots, or for search and rescue.

No longer applicable:
Designing and modifying an RC glider plane and cell system which can carry and power a small cell transceiver capable of locating cellular devices within a wide area through their pings. Primary issues will be power management, weight, and range, hopefully all of which can be addressed without sacrificing mobility. Will only be building one unit, but with three, one could triangulate on a cell phone. Although not ideally precise, narrowing down a search area to under a square mile would be a great benefit to many efforts.

Could not use cluster range test because protocol wouldn't allow it. Would like to explore that as an option in the future.

It might be easier to have the local radio device as the moving object and have multiple remote devices set up in known locations. Would be an interesting inversion of the project that would allow one to locate themselves.

Now defunct:

Decided not to use quadcopter because switching over to a powered RC glider means less of a power issue, as the lift doesn't come directly from the rotors spinning.

Adobe Portable Document Format - 1.03 MB - 06/03/2019 at 14:02

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  • 1 × Battery charger
  • 2 × Several Micro USB->USB connectors
  • 1 × XCTU to configure XBees and run range test
  • 2 × Digi Pro XBee S1 Electronic Components / Misc. Electronic Components
  • 1 × The items below were not used and were part of a plan that is no longer being pursued

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  • Whiplash update

    :D06/03/2019 at 13:05 0 comments

    Due to the intricacies of building something and getting said thing to fly, I decided to drop the flying bit. Because cell towers are not the most accessible things, I switched over to RSSI using XBees. There are some pretty drastic changes reflected in the rest of the site.

  • Issues

    :D01/23/2019 at 14:55 0 comments

    Am having difficulty finding components that can accurately determine distance between each other without having a GPS attached to both and just sending their location. Originally intended to do something with RSSI (received signal strength indication) and Xbees, but as it turns out that is an extremely inaccurate way of determining anything other than (there's either some amount of distance between these two objects or there's a bunch of objects in the way). On the scale I wanted to do this, this will not work.

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Florian Festi wrote 01/23/2019 at 16:58 point

May be you need to think about another solution. E.g. change in signal strength or direction. May be by shielding the antenna from different directions. Or by difference in time of flight between multiple antennas.

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