PLUME – Make a prototype


Today, I worked on a prototype of coil for the main emitters. I tried to make a complex object, however, Marco remind me that it is not necessary for a first prototype. We will add some fun, like LED to the project after. So, I made something very very simple. Now, I need to find the specifications, especially the section, of the copper wire that we will use and create the coil with 3D printing.


Moreover, I continued to work on my presentation of M.E.M.S with Noémie. We hope that it will be alright tomorrow…

Indoor Localization – We have a name


Some of you expected it… We finally have a name.

We are proud to announce that we call us : PLUME 😉

PLUME means Positioning and Localisation Using Magnetic Emitters.

Benjamin, Guénolé, Olivier, Marc-O, Virgile

PLUME – Putting things into equations

Yesterday I started putting things into equations. I haven’t studied Electromagnetism for a long time, but the formulas came back in mind quite easily (with the help of internet of course! ).

To put the problem into equations I had to use some approximations that may be corrected in the future, but after filling two pages of formulas and various sketches, I found the equations to use to calculate the position of a system being able to sense the magnetic field produced by a fixed emitter composed of three orthogonal coils.

I also read several documents about this type of localization technology, they confirmed some of the approximations I chose to make.

Today, I will try to find a way to calculate the orientation using this mathematical model. And continue to put everything I have written on my draft to a Latex file.

We may quickly need to test these formulas in a real situation to check if the approximations are correct or not.



Indoor Localization – Reading scientifics articles

Thanks to the quick comment of one personne about our project, today Benjamin and I started to study magnetic field indoor positioning and UWB positioning.

So, according to some scientific publications about the subject (especially a very interesting article of G. Pirkl an P.Lukowicz on Robust, Low Cost Indoor Positioning Using Magnetic Resonant Coupling 🙂 ) the solution using magnetic resonant coupling seems the better one.

Indeed, this has a number of advantages. As no waves are generated, wave phenomena such as interference and refraction do not occur. First good news.. Moreover, magnetic field is much more difficult to ”block” than electromagnetic waves. For instance, water which
is the main component of the human body, has no relevant influence. We also hope that “massive metal objects do not block the signal” and only have “local influence”. Last but not least information, the signal contains not only position, but also orientation information.

In summary, magnetic resonant coupling technology seems much less sensitive to disturbance typically found in indoor environments.

Unfortunatly, the physical principle of resonant magnetic coupling also creates some problems, in particular the energy use and the distance on localization which means theoriticaly high intensive magnetic field or relay devices to localize an object in a wide space.

Benjamin et Guénolé.

Indoor Localization – First Day

Hi 🙂

So, this is our first day of Rose. We are five in our group, Benjamin, Marc-Olivier, Olivier, Virgile and me Guénolé. In summary, our project involves positioning by detecting magnetic fields. To become better acquainted with the subject we began together our researches on physical phenomena involved, the various technologies available (for instance the Sixence project or Razer Hydra) and other related topics. Moreover, we started to define some technicals specifications.

Once our project is better defined we will give you more information. For the time being, we keep our group’s name secret…