Detection of Underwater Target Signals by Combining Cross-Correlation with Chaos Theroy
Hou Chu-lin · Torpedo Technology · 2006
The indexes of current noise restraint technology based on traditional detection theory have already reached their limits.In order to overcome the limitation in application of cross-correlation method,a new detection system for weak sine signal is proposed by combining the common cross-correlation detection method with chaotic detection method.Therefore,the detection of weak signal from strong noise background is realized by changing phase trajectory of chaotic system.The chaotic threshold in chaos-based detection system is analytically determined using the Melnikov function method.Simulation result shows that the system is very sensitive to weak sine signal under strong noise,and can effectively restrain any strong noise with zero mean.