8WU Guoqing,JI Shunxin,LI Jing ,CHEN Yaoming(Institute of Acoustics, Chinese Academy Of Sciences Beijing 100080)(National Laboratory of Pattern Recognition, Chinese Academy of Sciences Beijing 100080)LI Xungao(Naval Submarine Institute Qindao 266071).Passive sonar identification Ⅰ:Overall framework and extraction of line-spectrum[J].Chinese Journal of Acoustics,1999,18(2):128-135.