Real-Time Noncrosstalk Sonar System by Short Optimized Pulse-Position Modulation Sequences

Author

Meng, Qing-Hao ; Lan, Shao-Ying ; Yao, Zhen-Jing ; LI, Gen-Wang

Author_Institution

Sch. of Electr. Eng. & Autom., Tianjin Univ., Tianjin, China

Volume

58

Issue

10

fYear

2009

Firstpage

3442

Lastpage

3449

Abstract

Ultrasonic crosstalk is one of the main causes of false distance measurements that reduce the work efficiency of sonar sensors in mobile robots. To enhance the real-time performance of sonar systems, short digital pulse-position modulation (PPM) sequences are used to trigger ultrasonic transducers. Due to their properties of sharp autocorrelation and flat cross correlation, chaotic and pseudorandom number series are used to modulate pulse positions. A genetic algorithm is adopted to optimize the range of duration between pulses. Real experiments using Polaroid 600 series instrument-grade electrostatic transducers validate the suitability of the proposed method.

Keywords

crosstalk; genetic algorithms; pulse position modulation; random sequences; sonar; ultrasonic transducers; autocorrelation; cross correlation; distance measurements; genetic algorithm; mobile robots; noncrosstalk sonar system; pseudorandom number series; pulse-position modulation sequences; sonar sensors; ultrasonic crosstalk; ultrasonic transducers; Chaotic; crosstalk; genetic algorithm (GA); pseudorandom; pulse-position modulation (PPM); sonar;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2009.2017663

Filename

5223606