Detection of line-spectrum of radiated noises from underwater target based on chaotic system

A method based on chaotic theory for detecting weak line-spectrum of radiated noises for an underwater target is studied in this paper. Firstly, the threshold of chaotic critical state under any frequency is determined by the relationship curve between the inner radius of phase contrail and amplitude of inner signals. Then the radiated noise signals to be detected for an underwater target are injected into the chaotic system which is under critical state. Lastly, the test signal is detected using frequency-inner radius diagram. The simulation result shows that the proposed method can realize the detection of weak linespectrum and is simpler and more intuitionistic than the past chaos judgement methods.