ALPSThe Acoustic Location

Processing SystemPatrick Lazik, Niranjini Rajagopal,

Oliver Shih, Bruno Sinopoli and Anthony Rowe

Electrical and Computer Engineering DepartmentCarnegie Mellon University

Use near-ultrasound communication Decodable using existing mobile hardware Provide accurate indoor localization

Sub-room level (sub meter) Pulse compression

Highly-scalable Easy to deploy

Overview

System Architecture

Beacon Ultrasound

BLE Data

Beacon

PhoneNetwork Master

802.

15.4

Syn

c

Hardware Revisions

Generation 1 (SenSys ‘12)

Generation 2

Generation 3 (IPSN ‘14 Loc. Comp.)

Generation 4 (RTAS ‘15)

Generation 5

Ultrasound Transmitter PCB

Ultrasound Transmitter PCB with BLE

Receiver

From TDOA to TOF

Underspecified Ranging

Obstacles

?Time Synchronization

ALPS in Action

Coming Soon…• Auto floor-plan mapping/setup• IMU based tracking

THANK YOU!QUESTIONS?