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Echo-Based Distance Measurement on Mobile Phone
 Richter, Jiří ; Maršík, Lukáš (oponent) ; Černocký, Jan (vedoucí práce)
The aim of this work is to create an application for mobile device to measure distance using echo. It focuses on testing of device components and signal selection with appropriate parameters. In the first part of work --- evaluation of device ability to play and record sound --- the result is determination of sound frequency and strength with which the device is able to work. Next, the work describes the algorithm to measure distance based on using cross-correlation of transmitted and received signals. Finally, the implementation of aforementioned algorithm in application for Android operation system is presented, with solution for communication and synchronization between individual components of application. Implementation of designed algorithm in application is tested. Based on the data, we can conclude that it is possible to measure distance from half a meter to approximately three meters, based on noises, with a precision of tenth of a meter.
Úplný záznam
Echo-Based Distance Measurement on Mobile Phone
 Richter, Jiří ; Maršík, Lukáš (oponent) ; Černocký, Jan (vedoucí práce)
The aim of this work is to create an application for mobile device to measure distance using echo. It focuses on testing of device components and signal selection with appropriate parameters. In the first part of work --- evaluation of device ability to play and record sound --- the result is determination of sound frequency and strength with which the device is able to work. Next, the work describes the algorithm to measure distance based on using cross-correlation of transmitted and received signals. Finally, the implementation of aforementioned algorithm in application for Android operation system is presented, with solution for communication and synchronization between individual components of application. Implementation of designed algorithm in application is tested. Based on the data, we can conclude that it is possible to measure distance from half a meter to approximately three meters, based on noises, with a precision of tenth of a meter.
Úplný záznam

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