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Sensors 2017, 17(7), 1565; https://doi.org/10.3390/s17071565

A Frequency-Domain Adaptive Matched Filter for Active Sonar Detection

1
Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China
2
College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China
3
School of Engineering and Technology, University of Hertfordshire, Hatfield AL10 9AB, UK
*
Authors to whom correspondence should be addressed.
Received: 1 May 2017 / Revised: 20 June 2017 / Accepted: 29 June 2017 / Published: 4 July 2017
(This article belongs to the Special Issue Acoustic Sensing and Ultrasonic Drug Delivery)
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Abstract

The most classical detector of active sonar and radar is the matched filter (MF), which is the optimal processor under ideal conditions. Aiming at the problem of active sonar detection, we propose a frequency-domain adaptive matched filter (FDAMF) with the use of a frequency-domain adaptive line enhancer (ALE). The FDAMF is an improved MF. In the simulations in this paper, the signal to noise ratio (SNR) gain of the FDAMF is about 18.6 dB higher than that of the classical MF when the input SNR is −10 dB. In order to improve the performance of the FDAMF with a low input SNR, we propose a pre-processing method, which is called frequency-domain time reversal convolution and interference suppression (TRC-IS). Compared with the classical MF, the FDAMF combined with the TRC-IS method obtains higher SNR gain, a lower detection threshold, and a better receiver operating characteristic (ROC) in the simulations in this paper. The simulation results show that the FDAMF has higher processing gain and better detection performance than the classical MF under ideal conditions. The experimental results indicate that the FDAMF does improve the performance of the MF, and can adapt to actual interference in a way. In addition, the TRC-IS preprocessing method works well in an actual noisy ocean environment. View Full-Text
Keywords: adaptive line enhancer; frequency-domain processing; matched filter; time reversal convolution; active sonar detection adaptive line enhancer; frequency-domain processing; matched filter; time reversal convolution; active sonar detection
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Zhao, Z.; Zhao, A.; Hui, J.; Hou, B.; Sotudeh, R.; Niu, F. A Frequency-Domain Adaptive Matched Filter for Active Sonar Detection. Sensors 2017, 17, 1565.

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