間接回波 的英文怎麼說
中文拼音 [jiānjiēhuíbō]
間接回波
英文
indirect echoes-
In the fourth chapter, firstly, the fsk / psk signal function is presented, then, the signal which frequency and phase are modulated by costas code and barker code for each are analyzed at the same time. after that, the target returns and clutter returns are analyzed and modeled. at last, both of the time correlation characteristics and space correlation characteristics are theoretically analyzed
在第四章中，首先給出fsk / psk信號的表達式，並對一種分別採用costas碼和barker碼進行頻率和相位調制的fsk / psk信號進行分析，然後對fsk / psk信號的目標回波和雜亂回波進行分析與建模，接著，對雜波信號的時間相關性和空間相關性進行理論分析，由分析結果可知， fsk / psk雷達雜波的時間相關性不變、空間相關性增強。At the same time, the relationship between the sound speed traveling through the concrete and the compressive strength of concrete are analyzed, and then * relationship equations are obtained
接著，測試了混凝土宏觀力學強度，同時對混凝土超聲波傳播速度檢測值和抗壓強度測試值進行回歸分析，給出它們之間的關系方程式。From the result we get the following conclusion : for narrow - band signal, the effect of the method based on fft is best. for wide - band signal, when snr is up to certain degree ( higher than - 7db or so ), the curves of square error of modified methods are more obvious and closer to crb. for an echo composed of more than one frequency or direction, space - frequency distribution could show more direct information of frequency and direction, which is more advantaged to make precise judge and estimation for doa of echo
從估計結果發現，對于窄帶回波信號，基於fft的方法估計性能大大優于其他方法；對于寬帶回波信號，在信噪比達到一定程度（高於約- 7db ）時，補償后的幾種估計法的性能改善均比較明顯，誤差曲線越來越接近crb曲線；對于回波中存在多頻率多方位的情況，空間?頻率分布圖能提供較為直觀的頻率及方位信息，因此應用空間?頻率估計法來進行方位估計，更有利於進一步對回波的具體方位進行準確判斷和估計。And he recalls every word uttered at that first interview with potyomkin. and then he sees a plump, short woman with a sallow, fat face, the mother empress, her smiles and words at her first gracious reception for him ; and then her face as she lay on the bier, and the quarrel with zubov over her coffin for the right to kiss her hand
從而他回想起和波將金初次見面時所說的話，這時他眼前又出現那位個兒不高，胖臉蠟黃的皇太后，第一次親切地接見他時露出的笑容和她說的話同時他又回想起來她在靈臺上的面容，以及在御棺傍邊為了吻她的手的權利而與祖博夫之間發生沖突的情景。An universal equation, which can be directly used to compute the compensation resulted by the surface roughness, was deduced according to the flat - bottomed echo formula
根據大平底回波聲壓公式推導出了工件表面粗糙度和補償量之間的關系，可直接通過計算得到表面粗糙度引起的衰減量。This paper describes the definition of “ return wave attenuation ” and “ reflect attenuation ”, introduces theoretically the meaning of “ return wave attenuation ” on view point of power, points out the difference between “ reflect attenuation ” and “ return wave attenuation ” and demonstrates the test connection used as “ return wave attenuation ” measurement before being really “ reflect attenuation ” measurement
論述了「反射衰耗」與「回波衰耗」的定義，從理論上推導出「回波衰耗」在功率角度上的含義，闡明了「反射衰耗」與「回波衰耗」之間的區別，也論證了歷來作為「回波衰耗」測試的試驗接線實際是「反射衰耗」測試的試驗接線。The key problem to be solved in multi stations tdoa system is spatial and time synchronism between stations, weak signal detection and solution for high precision location equation
多站時差定位系統也有其自身要解決的關鍵技術和難點:多接收站之間的時間、空間的同步問題，目標回波的弱信號檢測問題，高精度的定位方程組求解方法。Since 1994, have engaged international trade talents, to overseas sale directly, besides four companies in hong kong, have opened up korea s., the middle east again, the business of countries, such as saudi arabia, holland, etc. is special, have reduced the expenses of the intermediate link and unnecessary return commission after the trade department < 1997 > sanctions becoming the export enterprise on one ' s own account outside the country, has strengthened the competitive power of enterprises greatly, on the basis of consolidating the original business, have continued openning up canada, germany, france, austria, u. s. a., poland, czech, italy, spain, country ' s business, such as sweden, etc., cut up till up till now with business contact take place directly to 21 foreign businessmen of 14 countries
自1994年開始，聘請了國際貿易人才，直接向海外銷售，除香港四個公司外，又開拓了南韓，中東，沙烏地阿拉伯，荷蘭等國的業務，特別，經國家外經貿部1997批準成為自營出口企業后，減少了中間環節的費用和不必要的回傭，大大增強了企業的競爭能力，在鞏固原有業務的基礎上，繼續開拓了加拿大，德國，法國，奧地利，美國，波蘭，捷克，義大利，西班牙，瑞典等國業務，截至到目前止與14個國家21個外商直接發生業務往來。According to the seismic convolution model, a kind of matched filters in time - scale domain is designed for echo signal detection of ground penetrating radar ( gpr ) and implemented in this paper, which is applied to detect the location and amplitude of single reflection wavelet in receiving signal through continuous wavelet transform
摘要根據地震褶積模型，設計並實現了應用於探地雷達回波信號檢測的時間尺度域匹配濾波器，利用小波變換的時間定位性和尺度伸縮性，檢測出雷達接收信號中單個反射子波的位置與強弱信息，利用已知的雷達發射子波模型還原回波信號，達到了濾除噪聲、最佳接收的目的。During my studying of postgraduate, i have accomplished above - mentioned researches and results listed below : 1 ) accumulated lots of experimental data of non - contact life - parameter detection system under different conditions, which is a good foundation for the next stage of this research. 2 ) brought forward the method of using adaptive processing to constrain the self - dithering interference. 3 ) brought forward the method of using acceleration sensor to detect the self - dithering interference as the referring signal of the adaptive filter. 4 ) compared the performances of adaptive algorithms based on fssms and vsslms, which is the basis of parameter - setting for applying adaptive processing to constrain the self - dithering interference in this subject. 5 ) constructed the mathematical model between the self - dithering interference and its radar return signal. 6 ) drew the conclusion of that there exists the correlativity between the self - dithering interference and its radar return signal. 7 ) drew the conclusion of that there exists the adding relation between the radar return signal of the self - dithering interference and the detecting signal. 8 ) developed the software for constraining self - dithering interference of non - contact life - parameter detection system
在就讀碩士研究生期間，本人從事以上工作取得的主要研究結果有： l 、積累了大量的不同條件下非接觸生命參數檢測系統的實驗數據，為檢測系統的下一階段研究打下良好的基礎； 2 、提出了採用自適應處理抑制非接觸生命參數檢測系統的自抖動干擾； 3 、提出了採用加速度傳感器檢測非接觸生命參數檢測系統的自抖動干擾作為自適應處理的參考信號： 4 、比較了固定步長和可變步長兩類ms自適應演算法的性能，為自適應演算法應用於本課題的研究提供參數設置依據； 5 、建立了非接觸生命參數檢測系統自抖動和自抖動雷達回波信號之間的數學模型； 6 、得出了非接觸生命參數檢測系統自抖動和自抖動雷達回波信號具有相關性的結論； 7 、得出了非接觸生命參數檢測系統自抖動雷達回波和第二頁第四軍醫大學碩士學位論文檢測信號具有加性關系的結論； 8 、研製了非接觸生命參數檢測系統自抖動干擾抑制軟體。The third part introduces the design, fabrication, analysis and testing of serveral types of variable optical attenuators. we have designed a micro - machining based voa that consists of an electromagnetically actuated gold - coated silicon mirror rotating around a 100 # am diameter shaft and a miniature driven coul. the voa is capable of fast dynamic response ( < 2ms ), great dynamic range ( 0 ~ 35db ), and low return loss ( < 55db )
論文利用有限元分析軟體ansys對該器件進行工作曲線分析及動態響應分析，分析結果與實測結果接近，實測結果表明，驅動電壓0 8v ，工作范圍0 35db ，動態響應時間為2ms ，插入損耗小於0 . 8db ，回波損耗小於- 50 . 5db 。2 a mathematical model of the reflected signal based on the frequency modulation continuous wave ( fmcw ) radar, solving the frequency - azimuth estimation of coherent signals by spatial smoothing technology, comparing the resolution of the object based on two - dim music method and that based on two - dim fft
2討論了在接收dbf條件下，回波信號的二維譜估計技術。建立了基於調頻連續波體制雷達下回波信號的數學模型，並將空間平滑技術推廣到時-空二維譜估計，解決了相干信號源的頻率-方位估計問題。分享友人