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VIGILANT: Smart Phone Navigation for Visually Impaired pedestrians


Software package and subscription for $49.99/yr. TECHNICAL GOALS Receive differential GPS ... GPS System. CURRENT STATUS ... Navigation for Visually Impaired ... – PowerPoint PPT presentation

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Title: VIGILANT: Smart Phone Navigation for Visually Impaired pedestrians

VIGILANTSmart Phone Navigation for Visually
Impaired pedestrians
  • Name Affiliation
  • Anani Afanou ECE4007 L02
  • Arpan Ghosh
  • Daniel Newsome Date
  • Ken Orji March 9, 2009

  • What?
  • Pedestrian turn-by-turn navigation using a
    Google G1 mobile phone
  • Who/Why?
  • Current navigation solutions for the visually
    impaired are cumbersome
  • Cost?
  • Software package and subscription for 49.99/yr.

Technical Goals
  • Receive differential GPS corrections
  • Remove noise using Kalman Filtering
  • Provide turn by turn navigational instructions
  • Dynamically updated
  • Pinpoint navigation destination
  • Within 1 meter accuracy
  • Supply user-friendly interface
  • Audio-based

Product Image
Design Approach
  • DGPS Base Station
  • Accepts connections and transmits corrections
    values over LAWN
  • G1 Smart Phone
  • Connects to DGPS server and receives corrections
  • Send corrections to receiver and gets back
    corrected user position (Bluetooth)
  • GPS Receiver (with user)
  • Calculates users position from satellite(s)
  • Applies DGPS corrections to calculated position

Smart Phone Interface
  • G1 Smart Phone (UI)
  • Scrollable list of bldgs. _at_ Tech
  • Google Maps - directions in real time.
  • Current user location to bldg. selected in list
  • Audio feedback of directions and list selections
  • Kalman filtering removes noise.

Calculating Correction of Satellite
Calculating User Position from Satellite
DGPS Corrections
User Position with Noise Removed
lt DGPS Corr. gt User Position
User Position from Receiver
Kalman Filter
Demo Description
  • Place Gatech Campus
  • Option1
  • Blindfolded team member navigates with VIGILANT.
  • Option2
  • Visually impaired volunteer navigates with

Potential Problem(s)
  • Problem
  • Some devices might not be Bluetooth compatible.
  • Resolution
  • Use hard wire instead (serial port).

  • Bluetooth/wireless connection of G1 to DGPS
  • Map interface on the G1 completed.
  • Kalman filter code for Android completed.
  • User Interface
  • Text to speech/audio UI
  • First complete application testing
  • Finish all testing
  • Ready for demo

Budget/Cost Analysis
  • Main cost is labor
  • 10,500 Four engineers design/build the product
    for 300 hours at 35/hr.
  • Other costs
  • T-Mobile G1 phone priced at 179.99 with
    contract, 399.99 without a contract. (Not
    included in total cost)
  • Marketing
  • VIGILANT product can be sold, as software
    package, for a fee of 49.99
  • Cheaper than the 1,649 price of competitors like
    the Sendero GPS System.

Current Status
  • Received the HTC G1 phone from Google.
  • Confirmed that DGPS base station is up and
  • The team is currently
  • Working with DGPS base station to test GPS
  • Researching a way to implement Kalman filtering
    accurately on Matlab.
  • Working on code to seamlessly implement text to
    speech together with Google Maps on the G1 phone