Key Laboratory of Instrumentation Science&Dynamic Measurement;
North University of China;
Taiyuan 030006;
China;
Institute of Acoustics;
Chinese Academy of Sciences;
Beijing 100190;
China;
Northern Institute of Automatic Control Technology;
Taiyuan 030051;
China;
towed linear array sonar; target radiated noise spectrum; line spectra level ratio(LSR); receiver operating characteristic(ROC)curve; post-processing;