An encoding and decoding scheme for long-distance ultrasonic localization

In ultrasonic localization systems, liner frequency modulation (LFM) signal, which is used as the basic signal for ultrasonic localization, has the capability of anti-multipath and high temporal resolution. However, the complex indoor environment will make it hard to detect and recognize signals at...

Full description

Saved in:
Bibliographic Details
Published in:Chinese Control Conference pp. 5247 - 5252
Main Authors: Ji, Cheng, Chen, Minlin, Sun, Peng, Shu, Haoran, Wang, Zhi
Format: Conference Proceeding
Language:English
Published: Technical Committee on Control Theory, Chinese Association of Automation 01.07.2020
Subjects:
Acoustics
Chirp
Decoding
Encoding
Encoding and decoding scheme
Indoor localization
Microphones
Multiaccess communication
Smart phone
Smart phones
Ultrasonic
ISSN:1934-1768
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In ultrasonic localization systems, liner frequency modulation (LFM) signal, which is used as the basic signal for ultrasonic localization, has the capability of anti-multipath and high temporal resolution. However, the complex indoor environment will make it hard to detect and recognize signals at the long distance in a large indoor environment. In this paper, we propose an encoding and decoding scheme for long-distance ultrasonic localization, which is able to work on the smart phone. Inspired by Code Division Multiple Access (CDMA), we propose to encode the reference signal, composed of preamble, guard interval and ID symbols, which can be used to distinguish beacons. Next, we can decode the signal by detecting preamble, estimate arrival time, demodulate ID symbols and cross-check the results. The experiment shows that the data can delivered at 5-bit in 170 ms and that more than 99 percent decoding accuracy can be achieved within 30 m localization range, which meets the needs of the localization system in the long distance.
ISSN:1934-1768
DOI:10.23919/CCC50068.2020.9188875