TEKK Tour Digital Wallonia 2017

Towards Large-Scale, High-Density IndoorUltra Wideband Geolocation Systems

M. Charlier and B. Quoitin(bruno.quoitin@umons.ac.be)

Computer Networking Research UnitFaculty of SciencesUniversity of Mons

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 2/17

Computer Networking Research Unit

IoT Lab

Sensors,signal

processing,embedded

Wirelessdata

transmission

Networkintegration

Cloudstorage

Dataprocessing

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 3/17

datacollection

point

Core IoT Components

● Design, improve and integrate core IoT components– node-to-node communications, routing, software energy efficiency, …

● Focus on standard IoT protocols (IETF)– IPv6, 6LoWPAN, RPL, CoAP

Sensing region(building, city, field, industry, body, ...)

borderrouter

Internet

remoteuser

radio

Bat

tery

sensornodes

T°C, humidity, presence, CO

2, ...

source

relays

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 4/17

(Indoor) Positioning Systems

http://www.bordersystem.be/

http://www.digitalmeetsculture.net

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 5/17

(Indoor) Positioning Systems

● Global Positioning System (GPS)– does not work well indoors

● Wifi / Bluetooth-based– narrowband (a few 10s of MHz)

– ranging based on signal strength

● UWB (Ultra Wideband)– use of very short RF pulses ; bandwidth

larger than 500 MHz ; low power spectral density

– works well in multi-path environments

accuracy ~ meters

accuracy ~ decimeters

accuracy ~ centimeters

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 6/17

UWB-based Positioning

● Architecture of System

A1

A3

A2

fixedanchors

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 7/17

UWB-based Positioning

● Architecture of System

A1

A3

A2

M1fixed

anchorsmobilenodes

M2

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 8/17

UWB-based Positioning

● Architecture of System

A1

A3

A2

M1fixed

anchorsmobilenodes

M2

low-cost prototype (BoM < 50 EUR/node)off-the-shelf UWB transceivers, embedded platformopen-source implementation in popular RTOS

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 9/17

UWB-based Positioning

● Architecture of System

A1

A3

A2

M1fixed

anchorsmobilenodes

M2

two-way-ranging

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 10/17

UWB-based Positioning

● Architecture of System

A1

A3

A2

M1fixed

anchorsmobilenodes

M2

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 11/17

UWB-based Positioning

● Architecture of System

A1

A3

A2

M1fixed

anchorsmobilenodes

M2

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 12/17

UWB-based Positioning

12000 ranging samples

error ≤ 3cm for 50% of samples

error ≤ 5cm for 90% of samples

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 13/17

UWB-based Positioning

2D localizationmost errors ≤ 5cm

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 14/17

We are heading for...

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 15/17

We are heading for...

● increased coverage O(10000 m2)● larger number of anchors O(100)● larger number of mobile nodes O(1000)● higher ranging / positioning rate O(100/s)● …

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 16/17

We are heading for...

● increased coverage ~ 10000 m2

● larger number of anchors ~ 100● larger number of mobile nodes ~ 1000● higher ranging / positioning rate ~ 100/s● …

How ?– channel access scheduling (e.g. time-division multiplexing)– non-ranging based techniques : Time Difference of Arrival (TDoA), Angle of

Arrival (AoA), hybrid methods, ...– sensor fusion : mobile node’s accelerometer / compass, received signal strength,

…– ...

M. Charlier and B. Quoitin (UMONS) TEKK Tour Digital Wallonia 2017 17/17

Thank you for your attention !

Questions ?