中文摘要：

为了适应水声对抗演习中实时监控潜艇的位置，从检测能力和声呐方程2方面分析了合作声信号的低截获特性．对比研究了扩频信号与常规的CW信号和线性调频信号的低截获性能，并进行了计算机仿真验证．仿真结果表明：采用扩频信号具有较低的截获性能和较好的检测能力．

英文摘要：

In order to support real-time monitoring the position of a submarine in acoustical manoeuvre, low probability of interception （LPI） was analyzed from the aspects of detection ability and sonar equation. Contrastive study on LPI between the spread frequency signal and usual CW and liner frequency modulation signals was conducted and validated by computer simulation. The results show that the spread frequency signal has good LPI performance and detection ability.