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http://dx.doi.org/10.5302/J.ICROS.2008.14.7.647

Implementation of the Ultrasonic Local Positioning System using Dual Frequencies and Codes  

Cho, Bong-Su (부산대학교 전자과)
Cho, Seck-Bin (부산대학교 전자과)
Yang, Sung-Oh (LG전자)
Baek, Kwang-Ryul (부산대학교 전자과)
Lee, Dong-Hwal (한국LPS)
Publication Information
Journal of Institute of Control, Robotics and Systems / v.14, no.7, 2008 , pp. 647-655 More about this Journal
Abstract
This paper presents real-time algorithm for an ultrasonic Local Positioning System(LPS). An ultrasonic LPS consists of 4 transmitters and n receivers. Each transmitter transmits an sequential ultrasonic signal to avoid interference of ultrasonic signal. This method is a noneffective application for a fast object. Because receiver detects four sequential transmissive ultrasonic signal and calculates a position. This paper proposes the method which 4 transmitters transmit simultaneous ultrasonic signal and each transmitter distinguished by frequencies and codes. And Auto-Correlation Function(ACF) method separates codes from an ultrasonic echo signal which is interference of each transmitter's code. If the receiver uses only ACF method, it is difficult to implement real time application for increased computation. This paper implements LPS using dual frequencies and ACF method. Using dual frequencies reduces codes length. The reduced codes length save computation in ACF. To prove this algorithm by experiment, high performance DSP(digital signal processor) used. The result shows the performance of the designed system is good enough positioning.
Keywords
ultrasonic; LPS; frequency; code; auto-correlation; ACF;
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