The main work of the first part includes : introducing some methods of underwater sound positioning and analyzing their performance , analyzing the theory of measuring direction and distance of the target by three elements symmetrical and dissymmetrical array , comparing the measuring error of two kinds of array , and giving the theory of the generic arrays and discussing the phase wrapping and the distance wrapping in passive ranging 对被动测距技术的研究工作主要包括：简单介绍了水声定位的几种方法，并对其性能进行了分析对比，分析了三元对称阵和非对称阵测向测距的原理，对两种阵型的测向测距误差进行了对比分析，还给出了一般阵型测向测距原理，最后还对被动测向测距中存在的相位模糊和距离模糊问题进行了探讨。
The intelligent mine will be the most important weapon system to defend arming helicopter hedgehopping in future war . passive acoustic detection technology is the key technology . with the researching of the national defence pre - researching project which is the research of acoustics compound fuse of anti - helicopter intelligent mine , this paper presents two type of acoustic localization algorithm , emphasizes the discussion of algorithm and presicion of space acoustic localization with sensors at different height in detail and compares them 智能雷弹是防御超低空飞行的武装直升机的重要武器系统，而被动声探测技术是其关键技术，本文结合“十?五”国防预研项目“反直升机智能雷弹声复合引信技术”的研究，对两种空间目标声定位算法进行了深入分析，重点讨论了空间高低阵定位算法，分析了定位精度。
In order to satisfy the need of real time and accuracy of the passive acoustic localization technology , we use tms320c32 ( dsp ) which produced by ti company as computing cpu , ram & rom of dsp had been extended largely . a whole software system of the passive acoustics detection system has been worked out 为满足被动声定位技术的实时性和精确性的要求，本系统采用了ti公司的tms320c32浮点dsp芯片作为计算用cpu ，对dsp的存储区进行了扩展，完成了被动声探测系统的dsp软件设计。
At first , this paper introduces the theory of passive acoustic localization , the factors of affecting the localization accuracy and the methods to improve the localization accuracy briefly . based on this , it analyzes the necessity of post - processing from the impact of environment and the character of signal respectively in detail 文中首先简要地介绍了被动声定位的原理、影响定位精度的因素及提高定位精度的方法，在此基础上从外部环境以及信号内在特性两方面较全面地分析了后置处理的必要性。
