echo time 中文意思是什麼
echo time
解釋
回波時間,回聲時間-
Based on the analysis of the beat frequency signal, the expression of the beat frequency phase is deduced. the expression indicates physics meanings of quantities to be detected and supplies theoretical bases for detection methods. by using two - dimensional fft, the range and velocity information of target is got out from the echo. according to the periodicity range ambiguity of symmetrical pulses in fmpcw, the processing method of sliding time window is used
通過對差頻信號進行的分析，得出了差頻相位的具體表達式，表現出了要檢測的各量的物理意義，對檢測的方法提供了理論依據。利用二維fft方法，可以有效地提取回波中目標的距離與速度信息。對于fmpcw信號由於均勻脈沖產生的周期性距離模糊的問題，採取時間波門的處理方法。 -
The return of the echo will elapse longer time.
回聲返回所耗的時間越長了。 -
The main research advances can be summarized as follows : ( 1 ) study the signal processing ' s performances and methods of homing torpedo system comprehensively, in order to setting up a corresponding mathematical models ; ( 2 ) analyze the ocean channel ' s effects on the work of homing system, then found some models such as target echo signal, noise ( including background noise, target radiating noise, etc ), ocean reverberation. according to them, simulate the array signal ; ( 3 ) the system structure, every function blocks composing are studied and founded thoroughly. then, discuss methods of signal processing in time domain and airspace domain ; ( 4 ) program the simulation software of torpedo ' s homing system according to the simulation models and flow charts, which connected with torpedo ' s control part
本文所作的主要工作及研究成果主要有以下幾個方面： （ 1 ）對自導工作過程中的信號與信息處理的基本理論與方法進行了較為全面的研究，為建立一個較為完備的自導模擬系統提供了理論基礎； （ 2 ）討論了自導系統工作過程中海洋通道對目標回波信號與目標輻射噪聲信號等的影響，建立回波信號的數學模型、環境場中的噪聲信號模型（包括海洋環境噪聲、目標輻射噪聲與魚雷背景噪聲等）與海洋混響模型，模擬產生了聲自導系統基陣接收到的回波信號與噪聲信號； （ 3 ）深入研究並建立了自導模擬系統的總體框架，給出各個具體功能模塊組成，討論了聲自導系統對信號的時域與空域處理，並結合模擬程序中陣列信號處理模塊，給出固定多通道波束形成的模擬實現過程； （ 4 ）根據系統的模擬模型與已建立的模擬流程圖編制了通用魚雷模擬器自導系統模擬軟體，通過網路與控制系統相連，組成完整的魚雷模擬器。 -
The specific research methods are listed : 1. matched filter taking the max ouput snr as the best rule correlates nonstop divided signal and divided echo to detect low snr target signal. then all one dimension divided correlation outs and done fft in portrait to leach interferential signal such as static or low rate mussy meaves, many pathway echo and so on and to take target ' s time difference and doppler frequency that combine parameters that target ' s direction taken from antenna and so on to implement target ' s orientation and tracking
具體研究方法如下： 1 、採用以輸出信噪比最大為準則的最佳匹配濾波器來對分段的參考和目標信號作相關處理來檢測低信噪比目標信號，然後對一維分段相關輸出組作縱向傅立葉變換來濾除靜態或低速的雜波、多徑回波等干擾信號，並提取目標的時差和多普勒頻率，再結合由天線獲得的目標方向等參數，就可以實現目標的定位和跟蹤。 -
The method that absorb return circuit design used in power design and electromagnetic valve drive circuit, system power and operating supervision to mcu and redundancy and digital filter technology to the time interval to send wave and echo are used in system design to ensure the reliability and accuracy of measure and control system
本系統在電源設計、電磁閥驅動電路中的吸收迴路設計、系統主電源和訛u運行監控以及採集的對發射波與回波時間間隔數據採用的冗餘技術和數字濾波措施，保證了測控系統的可靠性和精確性。 -
The propagation velocity of ultrasound in patient ' s shinbone can be achieved by figuring out the time span between emergent wave and echo wave
根據相關公式，只需計算出超聲波發射信號和回波信號的時間差，即可獲得定量超聲波在受試者脛骨的皮質骨中傳播速度。 -
The thesis reviews the theory which is the basis of synthetic aperture processing and introduces five algorithms of image reconstruction : the coherent addition provides a good opportunity for the real time sas ; the envelope processing can work when sonar echo returns lack phase coherence ; the i - q processing can reduce the sampling rate ; the broadband and ctfm processing are both aimed to increase the sas mapping rate
討論了用於重構圖象的五種演算法，包括簡單的可進行實時處理的相關合成法，可以在缺乏相位信息時使用的包絡處理法，可以降低采樣率、減少運算量、存儲量的正交處理法，可以提高聲納運行速度，從而提高成象率的寬帶處理法和ctfm法等五種演算法。 -
The basic characteristics of the current data network are point - to - point, connectless, doing one ' s endeavor, no quality of service, etc. these characteristics do not meet the requirement of real - time services, therefore, the realization of voip need support of the some key technology. these technologies includes : speech sound coding and data compression, real - time transmission and control, mute compression and multicast, acoustic - echo cancellation and comfort noise generator, dynamic monitor and guarantee of quality of network service, as well as, the compatible of different network and different protocol with each other
但現有的數據網路的基本特性：點對點的、無連接的、盡力而為的、沒有服務質量保證等特性並不適合與實時的業務要求，因此voip的實現需要一些關鍵技術的支持，這些技術包括：語音編碼和壓縮技術、實時傳輸和控制技術、組播技術、靜音壓縮和舒適噪聲生成技術、回聲消除技術、網路服務質量的動態監測和保證技術、以及不同的網路、不同的協議之間的互連互通等等。 -
When we evaluate the disturbed effect in ecm ' s test, in order to ensure that we can make exact commands immediately and get the exact evaluation of disturbed effect, it does the special significance that obtaining the disturbed radar ' s echo - video signal and redisplay the signal in real time
在雷達對抗試驗中，需要對干擾效果進行評估時，實時獲取被干擾雷達的視頻信號，並進行顯示，對保證試驗指揮準確及時，保證干擾效果評估的準確，都具有非常重要的意義。 -
In addition square design 12 the heavenly stems the twelve earthly branches column in the sun, ancient the heavenly stems for timing tool the twelve earthly branches, implied meaning to represent time, i hope, can with theme of sand at the i, echo each other, the building in the middle of the sun square is set as the round, hope it has by the look of on the plane figure been a stereoscopic round, and cover the ground and adopt the magnificent style that publicize, to reflect the enthusiasm of day is publicized, in addition the section of dim light of night represented by moonlight restaurant, i plan to have light more, can let people can fully experience the soft light makes the dim light of night pleasantly
此外在太陽廣場設計了12根天干地支柱，古代天干地支為計時工具，代表時間的寓意，我希望能和我時之砂的主題，相互呼應，太陽廣場中間的建築物設為圓形，希望從平面圖上看來是個立體的圓，而鋪地採用華麗張揚的風格，來體現日的熱情張揚，此外以月光餐廳為代表的夜色段，我打算多設燈光，能讓人能充分感受到柔和燈光下夜色迷人。 -
Multibeam echo sounder system is a kind of sea bed surveying instruments which can work efficiently and accurately its development originally bases on single beam echo sounder this kind of system is very suitable for massive sea floor surveying the technique behind multibeam echo sounder system has achieved its maturity with time passage
多波束測深系統是一種具有高效的、高測量精度的用於海底地形測繪的設備，它是在回聲測深儀的基礎上發展起來的，特別適合於大面積的掃海測量工作。 -
Refer to the impacting - echo technology, we impacted the apex of the steel bar and incepted the reflecting stress ave through the resonator that fixed on the apex of the steel bar, and the value of the consolidating wave speed was calculated based on the time of stress wave transmitted and the length of the steel bar, so, identifying the reflecting signal is the key of the consolidating wave speed method
借鑒于沖擊回波技術，固結波速的測定方法是在鋼筋測桿的出露端施加瞬態沖擊載荷，由安設在測桿頂端的傳感器接收反射應力波信號，根據應力波的走時和測桿的長度折算固結波速的大小，因此反射信號的識別是固結波速法檢測混凝土強度的技術關鍵。 -
On the premise that the basal transducer layout was designed according to the requirements of deep - sea exploring surroundings and technology on the basis of the hardware structure and data collecting ways of interferometric sonar, the echo signal by energy relativity search is analyzed and calculated, altitude data of the tiny terrain on the seabed under real - time irradiation of ultrasonic is gained as to provide parameters of best cutting depth for intellectualization of the seabed mining vehicle timely and promptly
摘要在相干聲納硬體結構及數據採集方式的基礎上，結合具體的深海鈷結殼探測環境和技術要求，確定了換能器基本布局，探討了信號採集與處理方法，利用能量相關搜索法對回波信號進行分析和計算，得出超聲波實時照射下的海底表面微地形高程數據，為海底采礦車智能化開采提供實時、快速的最佳切削深度參數。 -
The japanese - style houses, the faint echo of nagashi singing, the memory of the good - time girls who flocked here in days past
日式的房舍，依稀在耳的那卡西演唱，鶯鶯燕燕的滄桑風月，讓時光快門似乎在此打住，有一股老黑白片的情調。 -
Echo time delay estimation method for the ultrasonic testing of composite material
復合材料超聲檢測中的回波時延估計方法 -
By means of the echo auto - searching algorithm, the automatization of signal processing is realized. the filter algorithms are given to eliminate electric and pulse noise, the measuring reliability is improved greatly. furthermore, the accuracy of time difference measure is improved greatly by using the correlation algorithm and the wavelet algorithm
提出的自動搜索回波演算法，實現了回波數據處理的自動化;給出的改進滾動去極數字濾波演算法和極值濾波演算法，消除了電噪聲和脈沖噪聲，提高了測量的穩定性;提出的插值相關流量測量演算法、小波包絡壓力測量演算法大大提高了測量的精度。 -
Your dearest parents are waiting for you. " each time, i long to see these state - of - the - art masterpieces at the celestial jewelry exhibition, but i try to run away from those words of love and warmth that seem to echo in my ears
家中的父母你的至親，在等你每次珠寶展我都渴望看這些極品藝術，但卻又矛盾地想逃避那猶在耳邊響的句句心聲話語和無限溫情。 -
The system accomplishes ultrasonic pulse transmitting and receiving, signal amplitude adaptive adjusting, data acquiring, echo searching, data processing and analyzing. different algorithms for echo searching, filtering and time difference measuring are proposed based on the thorough analysis of ultrasonic echo signal
研製的超聲波液壓測量系統由超聲波探頭、超聲波收發系統、高速數據採集系統和計算機構成，實現了超聲波信號的發射、接收、自動增益控制、數據採集、自動搜索回波、數據處理、分析等功能。 -
The computer simulations show the validity of the models. 3. joint estimation of the time delay and doppler frequency based on short - time fourier transform ( stft ) and time - frequency analysis are studied to estimate the parameters of the underwater target echo
針對主動回波信號參量的估計問題，重點研究了利用短時傅立葉變換、時頻分析進行時延和多普勒頻移聯合估計，進而進行目標距離和速度參數的估計。 -
This radar database system fits for china ' s radar network using object - oriented programming design method, recording some important parameters of radar data : the longitude, latitude of radar station, radar type, radar wavelength, radar data format, weather kind ( kind of intensity radar echo, schema of velocity radar, echo shape ) embodying in the radar data, etc. it also records the weather course information embodying in a series of relational radar data : the beginning time of weather course, the ending time of weather course, weather type, etc and the disk information, including recording time, recording contents, recording data number and weather type, etc. above all, this system realizes some basic operational processing : adding, deletion, updating, query of records and also some assistant functions : exportation, data transformation, displaying, backing up of data
該數據庫系統採用面向對象程序設計方法，用visualc + + 6 . 0作為應用程序的前端開發工具，用microsoftaccess2000做數據庫，不僅實現了對雷達基數據信息的一些基本操作：記錄信息添加、刪除、修改、查詢，還實現了處理、分析雷達基數據所需的一些操作：數據導出，數據格式轉換、數據回顯（圖像方式和動畫方式） 、數據壓縮、備份等，另外針對日前雷達臺站存儲雷達數據的現狀，還實現了對存儲光盤的管理。
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