"Sumafofusuingu" which guides to the destination by using the Doppler effect, a position information guidance application which is strong in the short distance

Although GPS has come to be able to easily understand the current location being moved, it is also a fact that there is a part that lacks accuracy in short distance accuracy. KDDI currently developing technology "Sumafosuingu"Is an application that points to the target direction like a compass specialized in the short range that the GPS can not cover,Wireless Japan 2011It was exhibited at the venue.

Measure the distance by emitting a sound from the smartphone and analyzing it using the "Doppler effect" in which the pitch of the sound varies depending on the relative speed. It is not necessary to use external equipment to operate the application using a wireless antenna etc embedded in the smartphone itself, and it will be ready to be used just by downloading it to a commercially available smartphone.

For more information on "smartphone swing" that can be used for looking around, such as searching books in the library from the following. KDDI booth 's "smartphone swing" demonstration section.


By sending a sound wave while shaking the smartphone body slowly to the left and right, the sound wave reception time of the search target is recorded. It uses Bluetooth to notify the searching smartphone of the sound wave reception time, and it also estimates the direction from the terminal direction. To use this application, it is necessary to have wireless antenna (Bluetooth), speaker, microphone, geomagnetic sensor installed.


At the venue, we are doing demo with the assumption "I'm looking for a book in a library", a panel drawing a bookshelf in a corner of the booth is hung, and equipment is set so that it responds as a target book It is being done.


The high-pitched sound "Kyunkyun" is emitted from the smartphone and measures the position of the destination.

YouTube - Shake smartphone to grab location information "smartphone swing" demo


As a use image, when delivering pizza at a fireworks festival, a delivery member who has been wondering which person to give the item to in the crowd specifies an orderer in "smartphone swing" ... Are listed. Although it is a somewhat niche example, I understand that it assumes use at a short distance that can not be followed by GPS.


In addition, it seems to be thought to use it for searching books in libraries and book stores by modularization, and for finding cars in large parking lots. As this is more familiar example, the image may be easier to understand.


Although the timing of commercialization and commercialization is undecided, it is expected to be put to practical use because it seems to be quite useful for looking for personal belongings.