The designation scheme of deep doppler log is present and specifications are confirmed by theoretical computation . installation angle and velocity calibration are also analyzed in this paper 在此基础上，研究了大深度多普勒计程仪的设计方案，并通过理论计算确定了一套大深度多普勒计程仪的系统参数。
Measuring velocity precision is very important . in this thesis , the author researches on the location precision of doppler velocity log and compass , the precision of velocity precision of doppler velocity log 本论文就是针对这两方面而做的，主要围绕着辅助导航系统的定位精度和如何减小多普勒计程仪的测速误差进行的。
Accuracy of frequency estimation is the kernel of doppler log performance . bandpass sampling fft method , which is suitable for deep water doppler log , is present . accuracy of this method is desirable according to simulation results 在参考借鉴大量频率测量方法的基础上，提出了适用于大深度多普勒计程仪的频率估计算法-带通采样fft法，并进行了仿真计算，其精度令人满意。
In pool trial , the author compare the real - time results with the post processing results , which enhance the precision of velocity measurement . and we process the trial data using statistics methods , achieving that velocity measurement error is normal distribution 在多普勒计程仪水池试验部分，对实验数据进行了后置处理，提高了测速精度，并对数据进行了统计处理，得出测速误差呈正态分布的结论。
Unmanned underwater vehicle is a useful vehicle , which must be a high accurate and reliable navigation system . doppler velocity log and compass are the assistant navigation system of uuv . researching on their location precision is very necessary 多普勒和罗经辅助导航系统作为战时的备用系统，研究其导航定位的精度是不可缺少的，而作为组合导航系统和辅助导航系统组成部分的多普勒计程仪，其测速精度就异常重要。
The main tasks of this thesis are : discussing the dead - reckoning theory of doppler velocity log and compass , decreasing location error methods , emulating several ship tracks ; discussing several aspects influencing the velocity precision of doppler velocity log ; in a pool trial , processing the trial data and achieving some conclusions 本论文主要研究工作包括：对罗经和多普勒计程仪推算辅助导航系统的工作原理，及减小定位误差的两种方法和几种轨迹进行了研究；对影响多普勒计程仪测速误差的各个方面进行了综述；最后对多普勒计程仪水池试验的数据进行了处理，得出所要结论。
