Spectrum matching analysis of chaotic binary modulation excitation sequence for sonar systems

2012 ◽  
Author(s):  
Zhenjing Yao ◽  
Yanxing Song ◽  
Jingsong Yang ◽  
Qin Gao
Keyword(s):  
Binary Modulation ◽  
Sonar Systems ◽  
Excitation Sequence ◽  
Spectrum Matching ◽  
Modulation Excitation

Sensors Network for Ultrasonic Ranging System

2013 ◽  
Vol 5 (3) ◽  
pp. 47-59
Author(s):  
Tao Gao ◽  
Zhenjing Yao
Keyword(s):  
Band Pass Filter ◽  
Nsga Ii ◽  
Pass Filter ◽  
Multiple User ◽  
Correlation Characteristic ◽  
Ultrasonic Ranging ◽  
Band Pass ◽  
Excitation Sequence ◽  
Spectrum Matching ◽  
Sequence Match

The spectrum matching and correlation characteristic are both important in the multiple-user ultrasonic ranging system. As people know, an ultrasonic ranging system, which has a bell-shaped magnitude spectrum, acts like a band-pass filter. If the spectrum of the excitation signal does not match that of the ultrasonic ranging system, some of energy cannot be transmitted by the ultrasonic system. In other words, it does not make full use of the bandwidth of the ultrasonic ranging system. The good correlation characteristics can eliminate cross-talk among multichannel ultrasonic sensors firing simultaneously. To the authors’ knowledge, not many researchers considered how to make the spectrum of the excitation sequence match to that of the ultrasonic ranging system as well as improve the correlation characteristics. In this paper, the chaotic frequency modulation (CFM) excitation sequences are proposed for multiple-user ultrasonic ranging system. To obtain the excitation sequences which are spectrally matched to the ultrasonic ranging system as well as have the best correlation characteristic, the NSGA-II is applied to optimize the CFM excitation sequences.

Optimization of Matched Chaotic Frequency Modulation Excitation Sequences for Multichannel Simultaneously Triggered Ultrasonic Ranging System

2012 ◽  
Vol 4 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Zhen-Jing Yao ◽  
Tao Gao
Keyword(s):  
Frequency Modulation ◽  
Ultrasonic Sensors ◽  
Narrow Bandwidth ◽  
Correlation Characteristic ◽  
Ultrasonic Ranging ◽  
Working Together ◽  
Spectrum Matching ◽  
Nondominated Sorting ◽  
Lfm Excitation ◽  
Modulation Excitation

The matched spectrum and correlation characteristics are both important to realize the multichannel ultrasonic sensors working together. The spectrum matching can make full use of the bandwidth of the ultrasonic ranging system, and the good correlation characteristic can eliminate crosstalk among multichannel ultrasonic sensors triggering simultaneously. Linear frequency modulation (LFM) excitation sequences have been used as transmission signals for ultrasonic sensors. Due to the narrow bandwidth of the ultrasonic ranging system, the number of available LFM excitation sequences is limited. The chaotic frequency modulation (CFM) excitation sequences, which can generate more available excitation signals, are proposed in this paper. The nondominated sorting genetic algorithm-II is adopted to optimize both the spectrum and correlation characteristic of the CFM excitation sequences. After optimization, the CFM excitation sequences are spectrally matched to the ultrasonic ranging system as well as have best correlation characteristic. Real experiments have been implemented using an ultrasonic ranging system consisting of eight-channel SensComp 600 series electrostatic sensors excited with 2 ms CFM sequences. Experimental results show that spectra of the optimized CFM excitation sequences can match to the system and can work together without crosstalk.

Review of Animal sonar systems.

1980 ◽  
Vol 25 (11) ◽  
pp. 942-943
Author(s):  
DONALD A. DEWSBURY
Keyword(s):  
Sonar Systems

Sonar operator performance considerations in passive sonar systems

1975 ◽  
Author(s):  
R. J. Hornick ◽  
G. Yamashita ◽  
J. E. Robinson ◽  
H. J. Winkler
Keyword(s):  
Operator Performance ◽  
Passive Sonar ◽  
Sonar Systems ◽  
Performance Considerations

Applications of c.c.d.s to sonar systems

1980 ◽  
Vol 127 (2) ◽  
pp. 125 ◽  
Author(s):  
J.F. Dix ◽  
N. Dean ◽  
J. Widdowson ◽  
J. Mavor
Keyword(s):  
Sonar Systems

Study of Multiaspect and Multistatic Sonar Systems Using a Small-Scale Test Bed

2010 ◽  
Author(s):  
Jon La Follett ◽  
John Stroud ◽  
Pat Malvoso ◽  
Joseph Lopes ◽  
Raymond Lim ◽  
...  
Keyword(s):  
Small Scale ◽  
Test Bed ◽  
Sonar Systems ◽  
Scale Test
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