two-phase sampling 中文意思是什麼
two-phase sampling
解釋
二相抽樣法,兩相取樣-
Optimum design of sample size in two - phase sampling for stratifing
二相分層抽樣時的樣本單位數的最優設計 -
Presents the development of modern signal processing techniques, a new implementation method which realizes quadrature coherent detection by direct sampling of if signal generated during the implementation of traditional quadrature coherent detection with analog elements in the form of two parallel baseband channels where in phase ( i ) and quadrature ( q ) components of ceived if singnal where, the imperfect matching of the separate channels due to the analog elements results in high phase and amplitude which meets the needs for high performance radar signal processing, the elementary principles and the implementation process for each method and concludes from simulation results to compare their features and application conditions that the new approach can satisfy of the requirements of high performance sp
針對近年來提出的通過直接中頻采樣來實現正交相干檢波的方法，分析了其基本實現原理，並用統一的觀點解釋了迄今為止國內外基於此提出的各種實現方法；對每一實現方法的基本原理和實現過程都作了分析，並給出了計算機模擬結果；在此基礎上比較了各方法的性能指標及適應條件.理論分析和模擬結果證明，這一方法完全可以滿足高性能信號處理的要求 -
Based on the comprehensive analysis of the application status and the existed problems of transmission line fault location, this dissertation presented a new algorithm for fault location based on two - terminal asynchronous data, which can make correction for the integrate error of line parameter, length of transmission line, sampling value and so on. at the same time, it can work out the two - terminal asynchronous phase angle with the corrected parameters
本論文在充分分析了國內外故障測距的理論與技術以及存在的問題后，針對輸電線路故障定位因線路參數變化對定位準確度的影響，提出了能夠對線路的參數、長度和采樣值等誤差等進行綜合誤差修正（ cie ）的新演算法，並利用修正後的參數來求解兩端的不同步相角差。 -
Frequency source is widely used in today ' s electronic equipment and even refered as " a heart " of many electronic systems. the frequency synthesizer with a lot of channels and high frequency stability by means of theory of phase locking has almost been a necessary component in the modern electronic systems such as telecommunication, radar and electronic countermeasure. the phase - locked frequency synthesizer can be generally divided into two kinds : one is digital phase locked frequency synthesizer, the other is analog sampling phase locked frequency synthesizer. compared with the prior, the latter has many merits such as lower phase noise, samller volume, lighter weight and lower power consumption and has a wide foreground in the equipments of microwave band
利用鎖相原理來獲得波道數目眾多、頻率穩定度很高的頻率合成器，幾乎已成為現代通信、雷達和電子對抗等電子系統不可缺少的組成部分。鎖相式頻率合成器一般分為數字鎖相頻率合成器和模擬取樣鎖相頻率合成器兩類。取樣鎖相頻率合成器與數字鎖相頻率合成器相比，具有相位噪聲低、體積小、重量輕和功耗低等優點，尤其在微波波段的電子設備中，具有廣闊的應用前景。 -
Practice for sampling two - phase geothermal fluid for purposes of chemical analysis
化學分析用兩相地熱流體取樣慣例 -
Standard practice for sampling two - phase geothermal fluid for purposes of chemical analysis
化學分析用兩相地熱流體取樣的標準實施規程 -
The main tasks of this thesis are as follows : ( 1 ) a two - terminal fault location arithmetic based on the synchronization sampling of gps has been brought up. ( 2 ) because of the cost of gps and the truth that there is phase difference of two - terminal, the two - terminal fault location arithmetic is faced up with facts that how to keep the sampling data of two - terminal synchronous. according to that, two new methods are proposed, which do n ' t need the synchronized sampling data of two - terminal
全文主要工作如下： （ 1 ）利用全球定位系統gps的授時功能，提出了基於gps同步采樣的雙端故障測距演算法； （ 2 ）由於增加gps硬體設施，造價比較高，且客觀上雙端數據存在著不同步相差，雙端故障測距法所面臨的主要問題是兩端數據采樣的同步問題，針對這一問題，本文又提出了兩種不需要兩端數據采樣同步的工頻故障測距新方法，基於powell方向加速法和基於遺傳演算法的故障定位演算法。 -
6 sas institute inc. data mining and case for sampling : solvingbusiness problems using sas enterprise miner software. sasinstitute white paper, 1998. 7 chen b, haas p, scheuermann p. a new two - phase sampling basedalgorithms for discovery association rules
但與之相關的一個關鍵問題：取樣誤差的量化模型和快速估計方法的研究被人們所忽視，同時已有結果的效率和真實適用性還需要人們進一步的改進以適應日益增長大規模數據庫處理的需求。 -
Single chip needs too much time to calculate and we ca n ' t detect power quality real time for example, and the sampling rate must synchronize the signal frequency. when sample multi - channel signal in turn, it must have time delay between two samplings, so the phase angle difference between each channel signal is ca n ' t be avoid and so on. those problems must be solved
本課題分析了目前電能質量的各種檢測方法，認為快速傅氏演算法（ fft ）是首選方法，但是基於定時采樣的fft計算會產生頻譜泄漏，為了減少這個泄漏需要進行加窗處理，這需要增加采樣數據，導致顯著增大計算量。 -
The difference clock delay match technology adjusts the two channel ad analog clock phase and implements the two way ad uniformly - space sampling
差分時鐘延遲匹配技術通過對兩路ad的采樣時鐘進行相位調整，實現了兩路ad的等間隔采樣。
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