校頻 的英文怎麼說
中文拼音 [jiàobīn]
校頻
英文
frequency adjustment-
The energy centrobaric method is made use of correcting the doppler spectrum, the simulation predicted value of the target velocity is obtained
用能量重心校正法對多普勒頻移校正，進而得到物體的運動速度的模擬計算值。Due to existing signal processing technology ’ s shortage such aslow measurement, narrow measurement range precision and other poor performance, we introduced a high - precise signal processing technology : firstly, to get power spectrum with hanning windowed welch modified periodogram, search its peak value frequency ; secondly, to apply zooming analysis via goertzel algorithm ; at last, to get a highly precise doppler frequency with energy centrobaric rectifying algorithm 。 the simulating result indicated that this technology introduced could get accurate doppler frequency 。 depending on above discussed technology, we designed a signal processing scheme, and developed a signal processing system. the running result showed high performance, verified the feasibility and reliability of the highly precise signal processing technology introduced. in a word, the technology improved ldv ’ s performance such as measurement precision, measurement range, dynamic response time 。 and it will have a wide application foreground
針對存在的缺點，本文提出了一種應用於激光多普勒測速的高精度信號處理技術，即首先利用加hanning窗的welch修正周期圖演算法得到信號功率譜，搜索其譜峰值頻率，接著利用goertzel頻譜細化演算法對搜索的譜峰進行細化分析，再引入能量重心頻譜校正演算法對細化后的譜峰進行校正分析，從而將離散頻譜分析演算法、頻譜細化演算法和頻譜校正演算法三者有機結合起來，充分發揮各自的優點:通過加hanning窗的welch修正周期圖演算法快速得到功率譜及峰值頻率，通過goertzel演算法獲得分析頻帶的高解析度頻譜，然後通過能量重心校正演算法對細化后的頻譜進行高精度校正，這樣不僅保證了演算法的高效性，而且大大提高了分析的精度。From the fact of the often - happened campus murdering case in us and several criminal fastigiums in japan, it can be seen that juvenile delinquency has become the centurial problem harassing the modern society
從美國頻繁發生的校園槍殺案件，到日本的幾次犯罪高峰，青少年犯罪已成為困擾現代社會的一大世紀難題。At present, the remote education is developed vigorously in overseas especially in the usa, demonstrated by the new report of idc, it ' s accepted by the american colleges rapidly, the american institution nearly 90 percent will provide " on _ line learning " chances, the contemporaneity distance education network platform is formed roughly, which based on the cernet and satellite video system builded in 1994
目前，遠程教育在國外特別是在美國得到了蓬勃發展。據美國國際數據公司（ idc ）的一份最新調查報告，遠程教育迅速為美國大專院校所接受，到2005年，近90的美國高等教育機構將提供「在線學習」的機會； 1994年開始建設的以中國教育科研網（ cernet ）和衛星視頻系統為基礎的現代遠程教育網路平臺已初步形成。Metallic materials - calibration of extensometers used in uniaxial testing - video extensometer systems and their calibration
金屬材料.單軸向試驗用伸長計的校準.視頻伸長計系統Chapter 3 discusses the modules used in the fh - mpsk and fh - / 4dqpsk systems. these modules include : duc / ddc ( digital up converter / digital down converter ), nyquist flitter, burst start detection, interpolation module, pll ( phase locked loop ), pll error extraction, initial phase correction and the coding and decoding for tcm
第三章主要討論了跳頻模式下fh - mpsk和fh - 4dqpsk系統中各個模塊的設計，這些模塊包括：上下變頻器、奈奎斯特濾波器、信號到達檢測、插值模塊、通用環路、各環路誤差提取方法、初始相位校正和tcm編譯碼。Auxiliary pressure and temperature measurements make the multifrequency phase fluorometer an ideal choice for luminescence sensor design, testing and calibration
輔助壓力和溫度測量讓多頻相位熒光計是發光探測傳感器設計、測試和校準的理想選擇。Hermes - ancient mystery school teachings - the hermetic orders - which is linked with alchemy of consciousness - moving to a higher frequency of thought - releasing the hermetic seals at the end of time - or the illusion of time - the release of the soul from the physical form
赫密士? ?古代神秘學校的教導? ?隱藏的秩序? ?與意識的煉金術相連? ?移向更高頻率的思想? ?在最後時刻釋放密封的封印? ?或者時間的幻想? ?靈魂從肉體的形態釋放出來。Acoustics - calibration of high frequency hydrophone
聲學高頻水聽器校準The assembly language program collects and processes the data real time. comparing kinds of method of filter and arithmetic of fft, the author select the fir filter to realize pretreatment of signal and radix - 2 fft to distill the characters of librations
通過對各種濾波方法和fft演算法進行比較，本套數據檢測和校準處理系統採用fir濾波對採集到的信號進行預處理，利用基2fft演算法來提取信號的頻率特徵。Acoustics - low frequency calibration methods of hydrophones
聲學水聽器低頻校準方法" broadband education network " - building up a broadband educational network and providing schools with quality internet and intranet service
鼓勵建立寬頻教育網路，為學校提供優良的網際網路及內聯網服務Calibration specification for rf communication test set
射頻通信測試儀校準規范This paper starts the research of the liquid floated pendulous accelerometer testing system according to the engineering. at first, this paper gives the brief introduction of the history and present status of accelerometer and its testing technology, the working principium and math model of the liquid floated pendu - lous accelerometer, and then, decides the binary width pulse force retrim loop as the design proposal of testing system, researches the transfer function of every part in the system emphasizly, analyses the stability of the whole accelerometer testing system from the angle of control theoretics by the open loop transfer function of system, and designed the correcting net, analyses the basal problems such as resolution, sampling restraint, precision and so on, designs the hardware testing circuits such as preamplification, band - pass filter, alternating amplifier, phase sensitive demodulatorn, pulse - width modulation, frequency scale circuit, moment current generator. finally, using the graphics program language labv - iew which is designed for testing field especially by ni accomplishes the solfware design of testing system, realized the testing functions
首先對加速度計及其測試技術的發展歷史和現狀，液浮擺式加速度計的工作原理和數學模型等作了簡要的介紹，然後確定了以二元調寬脈沖再平衡測試迴路為設計方案，並從控制理論的角度進行了分析，著重研究了系統中各部分的傳遞函數，利用系統開環傳遞函數分析了系統的穩定性，同時設計了系統的校正網路;分析了二元調寬脈沖再平衡測試迴路的解析度、采樣約束以及測試精度等基本問題，並按照系統分析的結果設計了包括前置放大、帶通濾波、交流放大、相敏解調、脈寬調制、頻標電路以及力矩電流發生器等測試系統各部分硬體電路，驗證了電路的正確性，最後按照測試系統的要求，採用了美國ni公司專為測試領域所開發的虛擬儀器工具? ? labview作為測試軟體開發工具，利用該圖形化編程語言完成了測試系統軟體部分的設計，實現了測試功能。The spectrum evolution of the femtosecond laser pulse in a three - level organic molecular medium ( 4, 4 ' - bis ( dimethylamino ) stilbene ) is studied theoretically by solving the maxwell - bloch equations using an iterative predictor - corrector finite - difference time - domain method
摘要通過採用預估校正的時域有限差分法求解麥克斯韋布洛赫方程，我們研究了飛秒激光脈沖在三能級有機分子（ 4 ， 4 ' -二甲氨基二苯乙烯分子）介質中傳播時脈沖的頻譜演化情況。Calibration of vibration and shock pick - ups - method of test for resonance frequency of undamped accelerometers on a steel block
振動和沖擊傳感器的校準.鋼鑄錠無阻尼加速度計共振頻率的試驗方法Methods for calibration of vibration and shock pick - ups. resonance frequency testing of undamped accelerometers on a steel block
振動與沖擊傳感器的校準方法安裝在鋼塊上的無阻尼加速度計共振頻率測試On the part of the design of nine - component thrust vector stand, an automatic hydraulic pressure original position calibration system, a scheme of original position calibration, and the great rigidity universal flexible combinatorial underprop are designed. by using the scheme of “ universal flexible combinatorial underprop plus software digital filter ”, the inherent frequency of test stand is improved, and the problem of test stand libration is solved. then, the resolving method of the disturbance between underprops of the moveable frame is proposed, and the disturbance revise equation is deduced
在推力矢量試車臺設計方面，設計了自動液壓原位校準系統、原位校準方案以及大剛度萬向柔性組合支撐;採用「萬向柔性組合支撐+軟體數字濾波」的方案，提高了試車臺動架的固有頻率，解決了試車臺動架的振動問題;提出了動架約束互擾問題的解決方法，推導了互擾修正方程;研究了九分力推力矢量測量誤差分析方法，並計算了推力矢量測量精度。Verification regulation of tv colour subcarrier frequency comparator
彩色電視副載頻校頻儀檢定規程Estimated frequency and phase rotation principles and their realization in abpsk
解調中估頻校頻原理及實現分享友人