The fuzzy probabilistic data association of multiple targets tracking is presented in this paper , which define a target ? uzzy set on the measurement set at time k and then use fuzzy least mean square error method to estimate target states 给出了一种多目标跟踪的模糊概率数据关联方法,该方法在k时刻的回波集上定义一个目标模糊集,表示回波与目标之间的模糊关系。然后基于目标模糊集,利用模糊最小均方误差估计方法对目标状态作出估计。
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。
There are difficulties in noisy speech recognition , especially low signal - to - noise rations are more difficult . this paper describes briefly six methods for speaker - dependent noisy speech recognition isolated words . they are lpc prediction error method , one - side auto - correlation sequence lpc , acoustic front end processing , canonical correlation based on compensation method , combination of features method and increase of poles method . the experimental results show that all the six techniques can improve effectively noisy speech recognition , and the best noisy speech recognition rate is above 80 % when snr 0db 它们是:线性预测误差法,单边自相关线性预测法,语音前端声学处理法,正则相关分析的谱变换补偿方法,特征综合法和同模极点增加法。实验结果表明,这6种方法都有效地提高了噪声环境中语音识别率,其中较好的方法在强噪声环境中信噪比为0db的语音识别率达到80 %以上,为信噪比较低的噪声环境中自动语音识别展现了美好前景。
Many functions such as field information map , contrastive map of yearly yield , prescription map , etc . can be made . in order to improve using accuracy of agricultural gps , by analyzing the error of point , polyline , polygon , several methods are produced such as arithmetic average value , least squares , adding control points , etc . their principles , features and limitations are also analyzed and discussed . the mathematic model of average error method included in adding control points is established 为了进一步提高农用gps的使用精度,研究了提高精度的方法,通过对点、线、面等误差的分析,提出了应用算术平均值法、最小二乘法、加入控制点法等多种提高精度的方法,分析和讨论了它们的原理、特点与应用局限性,并建立了加入控制点法中的误差平差法的数学模型。
Trajectory designing has been a hot topic for the researchers and many methods have been presented . but most of methods nowadays for designing 3d horizontal wells are based on trial - and - error method . so well trajectory designing depend greatly on the experience of the designer , which lead to the time - consuming trial - and - error procedure while using those kinds of methods 近年来,水平井轨迹设计技术的研究一直较为活跃,相继提出了不少的方法及针对具体问题的具体做法,但这些方法从本质上讲,都未脱离试错法的范畴,井眼轨迹部分参数的确定取决于设计者的经验与直觉。