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| Design of Chaotic Waveforms and Demodulator for Application to Active Sonar System |
| Zhou Sheng; Lin Chun-sheng |
| Dept. of Weapon Engineering, Naval Univ. of Engineering, Wuhan 430033, China |
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Abstract In this paper a new kind of waveform is proposed to improve covertness of active sonar. A specified code is used to modulate the chaotic signal as waveform of active sonar. The issues of the distortions introduced by filtered by physical underwater channel and additive noise are discussed .Echoes are demodulated by adaptive filter .Recovered signals are identified by stored specified codes. The Lyapunov adaptive filter improved in phase space is applied to be demodulator. The obtained results indicate that proposed demodulator quickly and accurately recover original chaotic signal distorted by additive noise and filter. It is found that chaotic waveforms are better covertness than the classical waveforms of active sonar.
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Received: 13 April 2009
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Corresponding Authors:
Zhou Sheng
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2010, Vol. 32 
