Invention Grant
- Patent Title: Cloud-coordinated location system using ultrasonic pulses and radio signals
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Application No.: US14961029Application Date: 2015-12-07
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Publication No.: US09609482B1Publication Date: 2017-03-28
- Inventor: Roy Want , William Noah Schilit
- Applicant: Google Inc.
- Applicant Address: US CA Mountain View
- Assignee: Google Inc.
- Current Assignee: Google Inc.
- Current Assignee Address: US CA Mountain View
- Agency: Shumaker & Sieffert, P.A.
- Main IPC: H04W24/00
- IPC: H04W24/00 ; H04W4/02 ; H04W40/24

Abstract:
In general, this disclosure describes location techniques for a mobile device. A mobile device may request permission from a server device to perform a ranging operation. Responsive to receiving an indication of allowance, the mobile device may output a first data packet via a radio signal, which is received by a beacon device that activates an ultrasonic transponder upon receipt of the first data packet. The mobile device then outputs a second data packet via an ultrasonic pulse. The beacon device receives the ultrasonic pulse and outputs a third data packet via a second radio signal that includes information identifying the beacon device. The mobile device calculates a time difference between outputting the ultrasonic pulse and receiving the second radio signal and determines its location based on the third data packet and the time difference.
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