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 給出了一種多目標跟蹤的模糊概率數據關聯方法,該方法在k時刻的回波集上定義一個目標模糊集,表示回波與目標之間的模糊關系。然后基于目標模糊集,利用模糊最小均方誤差估計方法對目標狀態(tài)作出估計。
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 本論文主要研究工作包括:對羅經和多普勒計程儀推算輔助導航系統(tǒng)的工作原理,及減小定位誤差的兩種方法和幾種軌跡進行了研究;對影響多普勒計程儀測速誤差的各個方面進行了綜述;最后對多普勒計程儀水池試驗的數據進行了處理,得出所要結論。
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 它們是:線性預測誤差法,單邊自相關線性預測法,語音前端聲學處理法,正則相關分析的譜變換補償方法,特征綜合法和同模極點增加法。實驗結果表明,這6種方法都有效地提高了噪聲環(huán)境中語音識別率,其中較好的方法在強噪聲環(huán)境中信噪比為0db的語音識別率達到80 %以上,為信噪比較低的噪聲環(huán)境中自動語音識別展現了美好前景。
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 為了進一步提高農用gps的使用精度,研究了提高精度的方法,通過對點、線、面等誤差的分析,提出了應用算術平均值法、最小二乘法、加入控制點法等多種提高精度的方法,分析和討論了它們的原理、特點與應用局限性,并建立了加入控制點法中的誤差平差法的數學模型。
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 近年來,水平井軌跡設計技術的研究一直較為活躍,相繼提出了不少的方法及針對具體問題的具體做法,但這些方法從本質上講,都未脫離試錯法的范疇,井眼軌跡部分參數的確定取決于設計者的經驗與直覺。