time base signal 中文意思是什麼
time base signal
解釋
時間基準信號-
On the base of researching the theory of the scheme and analyzing the signal feature, it is obtained that the existence manners and character of distance information in the differential frequency signal. at the same time, a new conclusion is gained that the technology of frequency agility can decrease the constant error of system. it is also to say that frequency agility and frequency modulation fixed - distance fuze has the similar feature to random period frequency modulation fixed - distance fuze. according to the theory of address coding in the hopping - frequency communication, the paper presents the principle of selecting the frequency agility sequence which fit to the radio fuze and constructs the frequency agility sequence family based on the rs codes
在深入研究方案原理和分析信號特徵的基礎上，獲得了該體制引信差頻信號中，距離信息的存在形式和特點，得出了頻率捷變技術的引入降低了系統定距固定誤差這一新的結論，即頻率捷變調頻定距引信在定距性能上具有類似隨機周期調頻定距的特徵。本文引入跳頻通信地址編碼理論，結合無線電引信的具體特徵，提出了適用於無線電引信的頻率捷變序列的選擇原則，並構造了基於rs碼的寬間隔頻率捷變序列族。 -
By the result of these experiments, acoustic emission ( ae ) was chosen to use in the research. at the same time, we analyse the phenomenon of acoustic emission at the base of theory, the characteristic signal of acoustic emission which comes from the faulty bearing at the angle of application, and the expression of the characteristic signal. contrast was also made on the data achieved separately from vibrational signal and ae signal, and it is proved that ae is feasible and available to the diagnosis to the fault of the rolling bearing
主要工作有如下幾方面：對本段前期實驗室階段採用的振動法幅值域無量綱處理進行了分析，並研製了現場所使用的滾動軸承故障檢測裝置，將無量綱參數診斷法應用於段修現場，且做了大量試驗；對于現場試驗中所出現的問題進行了分析，提出將聲發射的方法用於軸承的在線故障診斷；從理論上分析了聲發射現象，從應用的角度分析故障軸承的聲發射信號的特徵以及聲發射信號特徵的表示方法，並在實驗室中，採用振動法和聲發射法實時檢測的實驗數據進行了對比和分析，證明了使用聲發射法對軸承故障檢測的可行性和有效性。 -
Arranged signal activating lock circuit and time - base control circuit in the sound wave receiving circuit to take the initial signal of back wave as the valid one in the cycle, thus to improve the ratio of signal vs. noise and detective precision
在超聲波接收電路中設有信號觸發鎖定電路和時基控制電路。實現以各探頭中最早收到的回波信號為本檢測單元的有效信號，有效提高信噪比和檢測精度； 4 -
The hardware circuit design include : industrial control computer configuration, selection of industrial control board type, design of the power supply and monitoring interface circuit, design of signal processing interface circuit ( the constant current source circuit, the time base signal processing circuit, the processing circuit for the signal to be measured ), design of panel control circuit, design of the system self - checking circuit, and etc. the program flow hart include : main program flow chart, system boot - strap self - checking program flow chart, manual static testing program flow chart, semiautomatic static testing program flow chart, automatic static testing program flow chart, dynamic testing program flow chart, transient testing program flow chart, source voltage and current monitor program flow chart, investigate function testing program flow chart, and etc. the measure system offers six working power supplies, the signal of time base, the signal of constant current source, sine wave signal and step to leap signal, and measures the frequency of the output pulse signal of the wide range pulse convert circuit accurately under three kinds of different test state ( static form, dynamic form and transient form )
硬體電路設計包括：工控機配置、工控板卡選型、產品電源及監控介面電路設計、信號處理介面電路（恆流源電路、時基信號處理電路、被測信號處理電路）設計、面板控制電路設計、系統自檢電路設計等。程序流程圖包括：主程序流程圖、系統開機自檢程序流程圖、手動靜態測試程序流程圖、半自動靜態測試程序流程圖、自動靜態測試程序流程圖、動態測試程序流程圖、暫態測試程序流程圖、電源電壓和電流監控程序流程圖、研究功能測試程序流程圖等。測試系統提供六路工作電源、時基信號、恆流源信號、正弦波信號和階躍信號，並對三種不同測試狀態（靜態、動態、暫態）下大量程脈沖變換電路輸出脈沖信號的頻率進行精確測量。 -
The frequency band extension with time base jitter is also studied by simulation. the results show that the compensation of time jitter can reduce the error of signal and then increase the accuracy of frequency band extension
對時基抖動的頻帶展寬技術的模擬結果表明，通過擴展的概率密度法對時基抖動的補償，可以減小信號的誤差，因而提高頻帶展寬的精度。 -
The time base drift deduced by the change of temperature is discussed particularly and the compensation method of it is analyzed. finally, we also studied frequency band extension under time base distortion condition by simulation. the results show that the compensation of time base distortion can reduce the error of signal and then increase the accuracy of frequency band extension
首先，介紹時基失真的相關概念及其對測量信號的影響；其次，對時基失真特性測量的不同方法進行了理論分析和比較，並對分析信號法進行了模擬研究；再次，對時基失真的補償方法進行分析和模擬研究；並專門對溫度變化引起的時基漂移及其補償方法進行了簡要分析；最後，對時基失真條件下的頻帶展寬技術的模擬表明時基失真的補償可以減小信號的誤差，因而提高頻帶展寬的精度。 -
Secondly, based on the analysis and simulations of the doppler time - shift for chirp - subpulse stepped frequency signal, this dissertation analyses the velocity compensation method for moving targets in chirp - subpulse stepped frequency signal, and presents a method for compensation of targets ’ velocity base on the least burst error rule
其次，本文對chirp子脈沖頻率步進信號的多普勒效應進行了分析和模擬，在此基礎上，分析了對其進行運動補償的思路，提出了採用最小脈組誤差準則進行運動補償的方法。 -
This paper gives a time - synchronization technique bases on gps time service signal which is used in broad band seismic recorder 。 by world coordination time offered by gps - - utc ( usno ), adjust local clock base on gps signal, gain high nicety clock signal, clock precision reachs 10 - 6 。 this clock is the time source of broad band seismic recorder, bring the whole seismic recorder works in same time base. 1pps time base with high stability can be used as in - phase, spring, time and start - stop of every collection mode, while the scale under second make a precise time mark to receive data of broad band seismic recorder
針對接收機中gps信號的噪聲進行kalman濾波軟體處理， kalman濾波可以對gps信號與本地晶振時鐘的時差數據在大噪聲中進行平滑，在較短時間內估計出高精度的時差數據。系統消除了gps秒脈沖信號的ms級隨機誤差，把晶振秒脈沖的長期穩定度鎖定到gps信號的穩定度上;在gps信號失效時給出了可行措施，能夠保證在任何情況下產生一個穩定、高精度秒脈沖信號，誤差在1 s內。 -
The type of the base function of wavelet analysis is not single, while the ft has only the sine ( or cosine ) function or exponential function. wavelet transformation has the character of multi - resolution analysis. wavelet transformation can analyze the signal in any precision ( resolution ) at any part of time and frequency according to the different translation factors and dilatation factors
小波變換具有多解析度分析的性質，對應于不同的伸縮因子和位移因子，小波變換能對信號的任何時間（空間）段、任何頻率段進行任何精度（解析度）的分析，在非平穩信號（包括瞬間信號）的分析中具有很大的優越性，分析時，在信號的低頻部分具有較高的頻率解析度和較低的時間解析度，在高頻部分則具有較高的時間解析度和較低的頻率解析度，被譽為「數學顯微鏡」 。 -
Simulation indicates : using band - pass sampling is right in digitalizing if signal ; it is necessary to use special chip to process if digital signal ; at the same time, it is feasible to process base - band low speed signal ( am, fm etc. ) by software
模擬表明：中頻數字化技術，使用帶通采樣方案是恰當的；現階段對中頻采樣信號使用專用晶元作降速率處理是必然選擇；同時，對基帶低速率信號（如am 、 fm 、 bpsk信號）作全數字化軟體處理是切實可行的。 -
In this paper, a new way of real - time damage detection method was proposed according to the high speed working situation of the composite flywheels for energy storage, and a suit of equipment was developed to test the composite samples with piezoelectric disc built - in, the response waves before and after the damage occurred were recorded to the computer. on the base of traditional spectrum analysis of signal recorded, the wavelet analysis was introduced and the program in matlab language was made. with the wavelet packet decomposition of the signal, the relations between the change of response signals and damage characters were gotten, a database for damage recognition was created
本文結合儲能復合材料飛輪高速旋轉的工作特點，提出了一種在線檢測飛輪轉子損傷的方法，自主設計一套實驗裝置對模擬各種損傷的的試樣進行了測試，試樣損傷前後的響應信號被採集后存入計算機中；在對採集信號進行傳統的頻譜分析的基礎上，引入了先進的小波分析理論，利用matlab語言編寫程序，對信號進行小波分解，得到了信號變化和損傷特徵之間的關系，建立了一個識別飛輪損傷的數據庫；小波包分解得到信號對比圖和特徵向量，可以有效判定材料內部有無損傷和損傷的程度，結合頻譜分析等，可一定程度上判定損傷的類型，為儲能飛輪的安全運轉和智能化運作提供了決策依據。 -
At the last we program the parameter detecting methods for frequency - shift track signal with c language and assembly language base on code composer studio of dsp. then we realize it on the dsp chip of tms320f2812. experiments shows that it can satisfy the demand of real time and precision
最後在dsp的集成開發環境ccs （ codecomposerstudio ）上採用c語言和匯編語言混合編寫移頻軌道信號的參數檢測演算法，並將該演算法移植到dsp晶元（ tms320f2812 ）上實現，測試結果表明上述演算法能夠滿足實時性和精度的要求。 -
In term of this theory, we decompose some simulate signal and pipeline mfl signal by wavelet package transform. then select the best wavelet package base out of the decomposed coefficient and figure the brickwork of the best base on the relevant position in time - frequency plane showing the strong or weak of every coefficient. as a result, the time - frequency structure of signal analyzed is relatively visually represented ; that is to say, an anticipative result achieves
按照這一理論，我們對一些模擬信號和管道漏磁信號作了小波包分解，然後從中選出最優小波包基，再把被選中的小波包基的相應砌塊表示在時?頻相平面上的相應位置上，並用灰度級別表示這個分量權重的強弱，結果較形象地把被分析信號的時?頻結構表現出來，達到了預期的目的。 -
The time - frequency of the wavelet transform and the signal wavelet decomposition - reconstruction algorithm based on the multi - resolution analysis are analyzed. the signal local singularity under the wavelet transform are studied. the difference between between mallat ' s maximun modulus algorithm and donoho ' s waveshrink algorithm are analyzed, too. the denoise effect of different threshold and threshold function are studied. base on compare the advantage and disadvantage of donoho & johnstone threshold and believing - region threshold, a modified algorithm is developed : combining threshold distinguishing and shield filter method
討論了基於mallat理論最大模數方法以及基於donoho理論的閾值萎縮去噪方法的差別，研究比較了不同閾值規則與閾值函數對去噪效果的影響；在此基礎上，結合統一閾值和置信區間閾值各自的優缺點，提出閾值判別和屏蔽濾波相結合的方法。 -
Chaper six compared the emd - based time - frequency analysis method to the typical ' s : short time fourier analysis, wigner distribution and wavelet anlysis, the result showed that the emd - based ' s is better than the others. to weaken the crossing interfere in multi - components signal in wigner distribution the emd - based wigner distribution was proposed and the study result showed that the method is valid. chapter seven built a experiment system at the base of rotor test bed, discussed characteristics of several typical fault in rotating m
第六章把基於emd的時頻分析方法分別與短時傅里葉變換、 wigner分佈分析、小波變換進行了比較研究，結果表明，基於emd時頻分析方法比上述方法有效；針對wigner分佈分析的交叉項干擾，提出了基於emd的wigner分佈分析新方法，研究結果表明新方法能有效地消除交叉項干擾。 -
Acoustic excitation signal is processed with wavelet analysis in this paper, and chooses characters related to adhesive capacity from acoustic signal in the time domain and frequency domain. these characters is the input of nerve network which is used to non - mangle test about mechanics capacity of adhesive structure, and establish the base for classify distinguishing effectively and forecast
本文採用小波變換的方法對採集到的聲激勵信號進行分析，在時-頻域提取出與粘接性能有關的特徵量，用於粘接結構力學性能無損檢測的神經網路輸入，從而為有效進行分類判別和預報奠定了基礎。 -
Base on the simu1ation model of signal and correlated noise model, the performance of different method is compared under different signal to noise ratio ( snr ). 6. the performance of differcni time delay estimation method is evaluated based on the analysis of real data
通過模擬數據對同一信噪比不同延估計方法性能進行比較，對不同信噪比下每種時延估計方法的性能進行比較，尤其在噪聲不同相關性下對不同時延估計方法的性能進行比較，得到各種時延估計方法在模擬條件下的性能差異。 -
Then on one hand, author makes researches of anti - jamming against pulse jamming 、 gauss white noise jamming and radio frequency noise jamming from the side of signal processing. author exercises much signal processing knowledge of time - domain sliding window accumulation 、 wavelet analysis 、 time - frequency analysis and linear prediction and carries out many simulation experiments. on the other hand, author proposes the anti - jamming methods of using a sar similar to double - base radar and modulating the amplitude 、 the phase of emission signal and changing the frequency modulation slope from the side of changing sar system model
作者首先提出了合成孔徑雷達抗干擾的定義、分類以及評價抗干擾方法好壞的主客觀標準；然後，一方面從信號處理的角度出發對脈沖式干擾、高斯白噪聲干擾以及射頻噪聲干擾進行了抗干擾研究，其中運用了時域滑動窗口積累，小波分析，時頻分析以及線性預測等信號處理知識，做了大量的模擬實驗；另一方面，本文基於改變合成孔徑雷達系統模式提出了利用類似雙基地雷達來抗干擾，以及對發射信號進行調幅、調相以及改變調頻斜率來抗干擾，同樣做了相應的模擬實驗。 -
Equipment that provides a time base used in a transmission system to control the timing of certain functions such as sampling and to control the duration of signal elements
在傳輸系統中提供時間基準的裝置，用於控制某些功能（例如采樣）的定時和控制各種信號成分的持續時間。 -
Background rebuilding of time sequence signal base on lebesgue integral
積分理論的時間序列信號中的背景重建
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