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| Application of interference suppression gate in line spectrum extraction |
| NIU Fang1, 2, 3, HUI Juan1, 2, 3, ZHAO Anbang1, 2, 3, 4 |
1.Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China;
2.Key Laboratory of Marine Information Acquisition and Security, Harbin Engineering University, Ministry of Industry and Information Technology, Harbin 150001, China;
3.College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China;
4.National Key Laboratory of Science and Technology on Underwater Acoustic Antagonizing, China
State Shipbuilding Corporation Systems Engineering Research Institute, Beijing 100036, China |
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Abstract Due to complexity of ship radiated noise and marine environment noise, it is difficult to directly extract line spectra from demodulated signals of ship radiated noise.Here, an interference suppression gate was designed to suppress broadband noise interference in line spectrum extraction.Simulations for single-frequency input signal and harmonic input one verified the effectiveness of the suppression algorithm.Moreover, statistical analysis was performed for the output signal to noise ratio (SNR) gain of the interference suppression gate.The processing results of actual ship radiated noise data showed that application of interference suppression gate can effectively reduce broadband noise interference, and provide convenience for line spectrum extraction; the extracted propeller shaft frequency can be taken as a feature quantity for ship target classification and recognition; the interference suppression gate algorithm can also be applied in line spectrum detection.
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Received: 19 March 2018
Published: 28 November 2019
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