W H E R E A R E T H E Y * N O W ? * T H E Y = S M A R T P H O N E S

L O C A L P O S I T I O N I N G T E C H N I Q U E S

L O C A L P O S I T I O N I N G S Y S T E M

• Locates users within a predefined space

• Relatively accurate positioning

• Unique user identification

• Persistent uniqueness

W H Y N O T G P S ?

• Doesn’t work indoors

• LPS can provide accurate, context-specific location

A P P L I C AT I O N S

• Wayfinding

• Retail analytics

• Gaming

• Art Installations

• Crowd density and traffic flow

• Home automation

A C T I V E C L I E N T ( C L I E N T- S I D E )

A C T I V E S E N S O R ( S E R V E R - S I D E )

A C T I V E C L I E N T

• Requires user interaction (must have installed an app)

• Allows for greater user interaction within your application

• Builds trust

• Accurate and reliable

A C T I V E S E N S O R

• Requires no user interaction

• Monitor existing wireless traffic from user devices

• Hard to detect

• Less accurate than active-user

• Central database = privacy risk

• Creepy, bro

L O C A L P O S I T I O N I N G I S N O T R E A L LY L O C A L I Z E D G P S

C O N S I D E R Y O U R R E Q U I R E M E N T S

P R E S E N C E - D E T E C T I O N

P R O X I M I T Y T R I G G E R S

A B S O L U T E P O S I T I O N I N G

P R E S E N C E D E T E C T I O N

• Simplest approach

• Can use a single sensor or an array of sensors for different areas

• Is user within your area (and roughly how far away are they)?

• Useful for traffic flow analysis and determining crowd density

Source: CNET

PA S S I V E W I F I S N I F F I N G

B E A C O N F R A M E S

P R O B E R E Q U E S T S

P R O B E R E Q U E S T S

• Broadcast or Targeted (with SSID)

• Client MAC Address

Source: TP-Link

W H AT I S I T G O O D F O R ?

P R O X I M I T Y T R I G G E R S

C A P P E D !

i B E A C O N

W H E R E C A N Y O U G E T S O M E B E A C O N S ?

i B E A C O N C O N F I G U R AT I O N

• UUID

• Major

• Minor

• Measured Power

i B E A C O N C O N F I G U R AT I O N

FD80C499-D6EC-42D5-87BC-D40F2D41522F

1 2

3

13

212

N O T O N LY F O R i O S

W O R K F L O W

• Scan for beacons with your project’s UUID

• Callbacks for Entering and Exiting the vicinity of a beacon

• Callback once per second (roughly) while within range of a beacon

• Can determine the proximity to a beacon

Far

NearImmediate

P R O X I M I T Y

A B S O L U T E P O S I T I O N I N G

A B S O L U T E P O S I T I O N I N G

x1, y1 x2, y2

x3, y3

-51 dBm-48 dBm

-44 dBm

R S S I R E A L LY S O M E T H I N G S O M E T H I N G I N A C C U R AT E

N O F I LT E R

K A L M A N F I LT E R

D I S TA N C E E S T I M AT I O N

2.9198m

3.2924m

6.9365m

RSSI at 1m: -40 RSSI at 1m: -41

RSSI at 1m: -39

RSSI: -52.0243 RSSI: -47.5238

RSSI: -45.9421

T R I L AT E R AT I O N

2.9198m

3.2924m

6.9365mx1, y1 x2, y2

x3, y3

client X, client Y

S O R T O F.

C O M M E R C I A L O F F E R I N G S

i B E A C O N

W I F I F I N G E R P R I N T I N G

S O U R C E : G A M A G R O U P, D E PA R T M E N T O F C O M P U T I N G , P O LY U

M A G N E T I C F I N G E R P R I N T I N G

L I G H T B E A C O N S

Source: ByteLight

N E W A P P R O A C H E S

N AV I S E N S

P R O J E C T TA N G O

W I F I S L A MSimultaneous Localization and Mapping

T H A N K S !

@edkeeble edwardkeeble.com