調相包絡 的英文怎麼說
中文拼音 [diàoxiāngbāolào]
調相包絡
英文
phase modulation envelope-
Two detection methods of chirp signals are presented in the dissertation : the cyclic autocorrelation detection method and the correlation detection method of cyclic autocorrelation function. it is shown that the two methods both have an excellent performance of blind detection. the performance analyses of the two detection methods are both carried out for additive noise or multiplicative noise, and the output signal - to - noise ratio ( snr ) expressions of the two methods are also derived
通過研究提出了兩種線性調頻信號的檢測方法?基於循環自相關函數包絡的檢測方法和基於循環自相關函數的相關函數包絡的檢測方法，兩種方法均可實現信號的盲檢測，有良好的檢測性能，文中還分析了加性噪聲及存在乘性和加性噪聲情況下兩種檢測方法的性能，推導出了輸出信噪比公式。In appraisal items choosing, we divide the items into three categories : profits, risk adjustment, and fluidness. detailed appraisal items are also set up to mirror the funds achievement comprehensively. in appraisal method choosing, we adopt universality analysis and the common used data envelopment analysis ( dea ) together, i. e., analyze the score of the numbered items first, then use dea and the analyzing software ems to calculate the funds " relative validity and get a rank of fund comprehensive achievement, trying to reflect the funds items and performance objectively
在基金的評價指標選擇方面：將基金的評價指標主要分為三大類：收益類、風險調整類和流動性類，並設定了細分評價指標，力求全面地反映基金的業績水平；在評價方法選擇方面：採用了一般性分析和基金評價中目前較為流行的數據包絡分析（ dea ）相結合的方法，即通過對指標的量化評分進行比較分析，通過數據包絡分析法，利用ems分析軟體計算基金的相對有效性，從而進行綜合業績排名，力求客觀地評價基金的各項指標和綜合績效。So they can not be used in on - line fault detection and condition monitoring. and the explanation of the time - frequency analysis is not easily accepted by the engineers. the experimental factors, such as rotational speed and measured position and fault distribution a
文中還針對轉速、測點位置、故障分佈（位置） 、負載等因素對頻譜分析、包絡分析、時延相關解調等方法的診斷效果進行了大量的實驗研究。By theory and practice simulation, the several types of constant envelope modulation techniques are analyzed and compared, including theirs modulation principle, phase path, the modulated wave envelope, power spectrums, error bit rate and the influence of its power spectrums of the band - limited and non - linear, etc. especially we have researched the ijf - oqpsk modulation technique, and the performance of its inter - symbol interference and time jitter free, and its strongly resisting of spectral spreading
結合理論和實驗模擬結果，分析討論了衛星通信中的各種恆包絡調制技術，對它們的調制原理，相位路徑，已調波包絡，功率譜密度，誤碼性能，以及帶限非線性通道對其功率譜的影響等方面都作了研究和比較。特別研究了ijf ? oqpsk在消除碼間干擾和定時抖動方面的性能及其優良的旁瓣特性和抑制頻譜擴展特性。From the research of ijf - oqpsk, we draw the conclusion that, compared with bpsk, qpsk and msk modems, in the band - limited and non - linear channel, it has nearly constant envelope, less spectral spreading, better pe performance and the less interference of the adjacent channel, et. so, it is more suitable for the satellite communication channel
通過對ijf ? oqpsk的分析研究可知，它相對于傳統的bpsk和qpsk調制方式，在帶限非線性通道下，具有包絡近似恆定，頻譜擴展小， eb no惡化小，對鄰道產生干擾弱等優點，因而它更適合於衛星通道。In order to research coordination between railway and highway transportation in modern logistics, the paper uses dea ( data envelopment analysis ), takes relevant data of china railway and highway transportation from 1990 to 2004 as input and output indices, makes standardized and integrated treatment to the data, applies dea model and linggo to establish solver of linear planning and calculate degree of coordinated development
摘要為研究鐵路與公路運輸在現代物流中的協調性，運用數據包絡分析方法，以1990 - 2004年間中國公路、鐵路運輸的相關數據作為輸入和輸出指標，並將數據進行標準化和綜合化處理，利用dea模型，用linggo編制線性規劃求解程序，計算協調發展程度。This thesis studied and introduced the method of msk modulation. it is a special type of constant envelope - continuous phase fsk
本文研究並介紹了msk調制方式，它是包絡恆定相位連續的頻移鍵控的一種特殊情況。It need n ' t to distill coherent carrier and there is no trouble such as phase faintness, loop hit etc. the packaged wave of n / 4dqpsk is comparatively tiny, which is appropriate to the mobile communication
/ 4dqpsk信號包絡起伏相對較小，比較適合移動通信。此外，它可以採用差分解調，也可以採用相干解調的方式。By integrating dematel, concordance analysis, fuzzy comprehensive evaluation, the analytic hierarchy process and dea, faedss established its databank, model bank, algorithm bank and help subsystem with the aid of vb 6. 0, matlab and other computer program language and recognized the integration of qualitativeness and quantitativeness, human brain and electron brain for factor analyzing and systematic evaluating. faedss was applied to the development problem of jilin provincial software industry in factor analyzing and efficiency evaluating of software enterprises
針對一個具體的問題，在眾多的影響因素中採用dematel等系統方法識別主要因素；對系統評價與決策問題採用協調分析、模糊綜合評判、層次分析原理（ ahp ） 、數據包絡分析（ dea ）等多指標評價與分析模型與方法，實現評價過程的定性定量相集成、人腦電腦相集成的科學化。The results of the experiment show that the peak value, rms, standard deviation, crest factor, kurtosis value and impulse value of the vibration signals can distinguish between the normal and abnormal conditions of the ball bearing when the level of noise is low
常用包絡解調技術對此類信號進行分析，但易受噪聲影響，使得齒輪或滾動軸承的故障特徵難以凸顯。本文從研究相關函數的特性入手，經理論證明，發現自相關函數並不改變調制信號的調制特徵，但具有顯著的降噪特點。Secondly, the model of ionospheric effects on spaceborne sar was made based on gauss envelope signals and rectangular envelope signals respectively
接著分別基於高斯包絡和矩形包絡線性調頻信號，深入分析了電離層對星載sar系統的影響機理，並給出相關的定量表達式。( 4 ) theoretical analysis is proceeding on the relationship of highway construction and social economy development on the aspect of macro - economic. the definition of continuable harmony development of highway construction and social economic is given. it is set forth that evaluation model of highway construction and social economic harmony development with dea model and ahp confine cone, together with object scale of local highway network at different social
（ 4 ）從區域宏觀經濟學和協同學角度出發，對公路建設與社會經濟發展供求關系進行了系統的理論分析，給出公路建設與社會經濟可持續協調發展的定義，建立了公路建設與社會經濟協調發展的帶有ahp （層次分析法）約束錐的dea （數據包絡分析）評價模型和區域公路網在不同的社會經濟發展階段應具有的發展規模以及與發展階段相適應的路網等級結構的優化配置模型，通過實例對公路建設分享友人