Title :
Studies on frequency domain acoustic signal detection method with a small aperture sensor array
Author :
Jing Wang ; Jianguo Huang
Author_Institution :
Coll. of Marine Eng., Northwestern Polytech. Univ., Xi´an, China
Abstract :
The noise background of small aperture sensor array is spatial color noise for underwater sonar detection system. A super-directive beamform in frequency domain (FSD) method is proposed to solve the problem that the array gain of super-directive beamform cannot reach maximum when there exists error in the estimated noise matrix under spatial color noise background. The wideband received data are divided into several sub-bands, and noise covariance matrix in each sub-band is estimated, which reduces the error of estimated noise matrix. Estimated noise covariance matrix is used to de-correlate the received data. At last, spatial spectrum detector is employed to detect weak acoustic signal. Experimental results show that the detection performance of FSD is better than super-directive beamform in time domain (TSD) and minimum variance distortionless response in frequency domain (FMVDR) of 2dB.
Keywords :
acoustic signal detection; array signal processing; covariance matrices; frequency-domain analysis; sonar detection; time-domain analysis; FMVDR; FSD method; TSD; estimated noise matrix; frequency domain acoustic signal detection method; minimum variance distortionless response in frequency domain; noise covariance matrix; small aperture sensor array; spatial color noise background; spatial spectrum detector; superdirective beamforming in frequency domain method; superdirective beamforming in time domain analysis; underwater sonar detection system; weak acoustic signal detection; wideband received data; Arrays; Covariance matrices; Frequency-domain analysis; Gain; Signal to noise ratio; Wideband; Acoustic signal detection; Array signal processing; Sensor arrays; Sonar detection; Wideband;
Conference_Titel :
Signal and Information Processing (ChinaSIP), 2013 IEEE China Summit & International Conference on
Conference_Location :
Beijing
DOI :
10.1109/ChinaSIP.2013.6625418