• 39th CSUN Assistive Technology Conference - March 18-22, 2024 at the Anaheim Marriott

    The Premier AT Conference

39th Annual CSUN Assistive Technology Conference Has Concluded

Low-Cost Wayfinder Using Bluetooth Angle-of-Arrival

Date & Time
Wednesday, March 20, 2024 - 9:20 AM PDT  
Platinum 1  

This project created a fully functional location-tag-based point-to-point wayfinder system to help the visually impaired navigate large public facilities like airports and shopping centers. This wayfinder uses the Angle of Arrival (AoA) feature from the Bluetooth 5.1 spec but deviates from the intended setup for AoA in traditional Indoor Positioning Systems (IPS). The simplified solution introduced in this project only uses one antenna array on the user device, a low-cost alternative to the expensive full-premise mesh network used in IPS.

This wayfinder successfully detected the direction and distance of a target marked by a low-cost Bluetooth antenna. The direction-sensing capability calculates the angle from the phase difference measured by two adjacent antennas on the user’s antenna array following the newly introduced AoA concept. The target distance estimation is derived from the traditional Bluetooth Received Signal Strength Indicator (RSSI). The wayfinder demonstrated directional angle accuracy of less than 10 degrees within the 15-meter range. The Python program written for this project shows the user an intuitive radar-like display. As a future improvement, the 15-meter range can be extended to over 84 meters by amplifying the 3mW transmission power to 100mW, and a voice notification system can be built for more serious visually impaired users.

This Presentation Link is provided by the Presenter(s) and not hosted by the Center on Disabilities at CSUN. The Center on Disabilities has confirmed, as of March 27, 2024, content linked is relevant to the presentation, but has not been reviewed for accessibility nor will the Center on Disabilities attempt to remediate any accessibility issues in the linked content. Please contact the Presenter(s) with any accessibility concerns.

  • Higher Education
  • Information & Communications Technology
  • Disability Specific
  • Research & Development
  • Transportation
Audience Level
Session Summary (Abstract)
As a low-cost alternative to expensive mesh-based Indoor Positioning Systems, a location-tag-based point-to-point wayfinder using Bluetooth Angle of Arrival (AoA) direction sensing was created to help visually impaired people navigate indoor spaces.  
Primary Topic
Emerging Technologies  
Secondary Topics
  • Blind/Low Vision
  • Engineering
  • Mobile Technology
  • Research
Session Type
Journal Track  


  • Brandon Cai

Add to Outlook/iCal (How it works)

Back to Session List