Archive for January, 2014

Current development

Thursday, January 30th, 2014

We are cur­rently in a period of inten­sive devel­op­ment. We have now used our units for over two years. Dur­ing this period we have learnt a lot and the devel­op­ment on the sen­sor mar­ket has been sig­nif­i­cant. To take advan­tage of this we are now devel­op­ing a new gen­er­a­tion of the mod­ules as well as mak­ing sig­nif­i­cant updates to the embed­ded soft­ware. The tar­geted fea­tures for the new mod­ules are:
– Sin­gle chip IMUs (lower cost and pro­file)
– Wire­less and bat­tery pow­er­ing
– Inclu­sion of a mem­ory
– Mag­ne­tome­ters
After a stopover at IISc, John-Olof is at IIT Kan­pur (India) since a week back in time. Here the tar­get is to carry out the devel­op­ment in coop­er­a­tion with GT Sil­i­con Pvt Ltd, an elec­tronic sys­tems design com­pany with whom we have had a long relation.

Cur­rently, we are in a PCB design and fab­ri­ca­tion phase. The IMU array boards which were briefly men­tioned in this post is to some degree a pre­de­ces­sor of these mod­ules (as well as a sep­a­rate track in terms of research) and have been act­ing as test­boards for some embed­ded software-hardware design ideas. In par­al­lel with the devel­op­ment with the new mod­ules, we are work­ing on the soft­ware. Some of the soft­ware updates are already avail­able on Source Forge. For exam­ple sup­port for the IMU array is already there. Cur­rently a com­plete mea­sure­ment fron­tend is under development.

More infor­ma­tion will be posted shortly.

Real world tests

Wednesday, January 15th, 2014

As pre­vi­ously said, we have used the Open­Shoe units to build a com­plete infra­struc­ture free coop­er­a­tive local­iza­tion sys­tem. A cou­ple of month ago we did some lit­tle larger field tests for the first time, with smoke­divers from a nearby firede­part­ment. One of the tests runs can be seen in the fol­low­ing vide clip. This gives a high level exam­ple of the poten­tial of the imple­men­ta­tion. Enjoy!

Publications from IPIN2013 and some more …

Monday, January 13th, 2014

At the last IPIN con­fer­ence in France we pre­sented two papers:

These have now been added under the pub­li­ca­tions section.

The for­mer paper con­cerns how the com­plete coop­er­a­tive local­iza­tion sys­tem and head-related-transfer func­tions (HRTFs) may be exploited to pro­vide a spa­tial per­cep­tion of rel­a­tive loca­tions within a group. Sim­ply, an agent will here where he has his col­leagues when they talk and vice versa. The sec­ond arti­cle con­cerns a small detail in the mech­a­niza­tion imple­men­ta­tion which will pre­vent the foot-mounted iner­tial nav­i­ga­tion sys­tem from drift­ing when an agent is stand­ing still.

The arti­cle Coop­er­a­tive local­iza­tion by dual foot-mounted iner­tial sen­sors and inter-agent rang­ing has now gone into print and can be found open access on EURASIP’s site. (Pre­vi­ously it was only avail­able from arXiv.) The same goes for the Recur­sive Bayesian ini­tial­iza­tion of local­iza­tion based on rang­ing and dead reck­on­ing paper.