信雜比 的英文怎麼說

中文拼音 [xìnzábǐ]
信雜比 英文
signal-to-clutter ratio
  • 雜 : Ⅰ形容詞（多種多樣的; 混雜的） miscellaneous; varied; sundry; mixed Ⅱ動詞（混合在一起; 攙雜） mix; blend; mingle
  • 比 : Ⅰ動詞1 （比較; 較量高下、 長短、距離、好壞等） compare; compete; contrast; match; emulate 2 （比...
  1. Again call the the ratio, namely the electric voltage of the enlarger s exportation signal with at the same time output s voice ratio for electric voltage, usually use the decibel number to mean. the equipments s letter the ratio is more our output of high enunciation is more little. by any large, letter the ratio is more big, and the elucidation is in the in the signal a the quantity for more smallly, voice returning putting is more high, otherwise contrary. letter the ratio should be generally not lower than 70 dbs, high the letter of the true box the ratio should attain 110 dbs are above

    又稱為訊噪比，即放大器的輸出信號的電壓與同時輸出的噪聲電壓的比，常常用分貝數表示。設備的信噪比越高表明它產生的雜音越少。一般來說，信噪比越大，說明混在信號里的噪聲越小，聲音回放的音質量越高，否則相反。
  2. 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。
  3. Owing to complicated earth ' s surface condition such as the steep stratum outcropping of front - zone of mountain or the huge thick gravel stratum ' s overlay and earth ' s surface large undulation, complicated underground geology structure developed extremely such as thrust and overthrust nappe, and violent change of the lateral velocity, etc. in front - zone of mountain there are a series of problems such as serious secondary disturbance and low signal - to - noise ratio in seismic exploration gathering

    由於山前帶高陡巖層出露或巨厚礫石層的覆蓋、地表起伏大等復雜的地表條件、逆沖和逆掩推覆等復雜地下地質構造發育、速度橫向變化劇烈等原因，造成了山前帶地震勘探資料採集存在次生干擾嚴重和信噪比低等一系列問題。
  4. It has a signal - to - noise ratio ( snr ) of at least 75 db

    它有一個信號雜訊比（信噪比）的至少有75分貝。
  5. It is an unfathomed and difficult problem that weak and small targets are detected in complicated background and low snr

    摘要復雜背景下低信噪比弱小目標的自動檢測是當今目標自動探測研究尚未解決的一個難題。
  6. A new wavelet - bispectrum united detection algorithm is proposed to face with problems such as the complex structure and low signal to noise ratio of radar echo, when there exist difficulties in detecting impulses in through - wall radar systems

    摘要針對沖擊體制穿墻雷達系統中回波信號結構復雜、信噪比低、信號檢測困難等問題，提出一種小波雙譜聯合檢測新演算法。
  7. According to characteristics of the seismic data from the low snr region with complex surface, this paper is started from solving the static correction problem and reasonable eliminating all kinds of disturbance in the seismic data from the low snr region with complex surface. through the whole process of seismic data processing which includes a series of processing methods that are suitable for the low snr region, namely, from the choosing of the floating base - level, the static correction in the field and indoors, the eliminating of all kinds of noise before and after stacking, the velocity analysis with high - resolution, the reasonable techniques of deconvolution before stacking and wavelet processing after stacking, to the method choosing of the high - resolution stacking and the reasonable and accurate offset imaging, a set of the complete and effective flow for processing seismic data from the low snr region with complex surface are finally formed, which can meet the need of explo

    本文針對復雜地表低信噪比地區地震資料的特點，以解決復雜地表低信噪比地區地震資料靜校正問題及合理剔除各類干擾為出發點，在整個地震資料處理過程中，從浮動基準面的選取、野外及室內靜校正、疊前疊后各類噪音的去除、高精度速度分析、合理的疊前反褶積及疊后子波處理技術、到選用高精度的疊加技術及合理準確的偏移成像方法等一系列適合於復雜地表低信噪比地區的處理方法，最終形成一套較完整且有效的針對復雜地表低信噪比地區地震資料的處理流程。
  8. 4. the dissertation studies in - depth the multi - aperture sar mtdi based on along - track interferometry ( ati ). it presents and describes the detecting processing in sar image domain using double apertures and analyzes the influence of all kinds of factors including ground clutter, noise, signal - to - clutter, range velocity, multi - look processing and etc on the detection performance

    4 、深入研究了基於沿跡干涉釁1 ）技術的多孔徑sar系統地面動目標檢測和成像方法，給出了採用ati方法對兩幅sar復圖像進行慢速目標檢測的完整過程，詳細分析了各種因素如雜波、噪聲、目標信雜比、目標速度及多視處理等對檢測性能的影響，並通過大量的模擬給予驗證。
  9. Under rayleigh fading channel, we also simulated and compared ber in siso 、 simo and mimo systems. secondly, based on careful study the ber and the channel capacity under white noise channel under mpsk modulation when the channel is rayleigh fading, we duduced the expressions of stbc ’ s ber and channel capacity under rice and nakagami fading. and also analysed the performances through numerical simulation using matlab to testify the exactitude of the dudeced expressions. finally, there exists an error floor of stbc through studying on its performance on time - selectiv fading channel. we analysed the reason and proposed two new decode combination scheme to eliminated the error floor and the performance of stbc on time - selective fading channel is improved. and also compared the two scheme ’ s complication and snr gain

    這些結果大部分是閉式結果，能比較準確地衡量空時塊碼的性能，並對不同衰落的性能做了相互比較，其結果對空時塊碼的實際應用具有一定的指導意義。實際的通道是時變的，分析了空時塊碼在時間選擇性衰落通道中產生誤差地板效應的主要原因是存在碼間干擾（ isi ） ，在此基礎上提出了兩種能消除誤差地板效應的譯碼合併方案，並對這兩種方案的復雜度和信噪比增益進行了比較。
  10. An algorithm for detecting moving ir point target in complex background is proposed, which is based on the reverse phase feature of neighborhood ( rpfn ) of target in difference between neighbor frame images that two positions of the target in the difference image are near and the gray values of them are close to in absolute value but with inverse sign. firstly, pairs of points with rpfn are detected in the difference image between neighbor frame images, with which a virtual vector graph is made, and then the moving point target can be detected by the vectors ' sequence cumulated in vector graphs. in addition, a theorem for the convergence of detection of target contrail by this algorithm is given and proved so as to afford a solid guarantee for practical applications of the algorithm proposed in this paper. finally, some simulation results with 1000 frames from 10 typical images in complex background show that moving point targets with snr not lower than 1. 5 can be detected effectively

    基於運動點目標在鄰幀差分圖像中所具有的近鄰反相特徵，即運動點目標的兩個位置相鄰近、灰度值一正一負，提出一種在復雜背景下，基於紅外序列圖像的運動點目標檢測演算法.本演算法利用該特徵在鄰幀差分圖像中檢測反相點對，進而構造反相點對矢量圖，最後依據累積反相點對矢量圖中多矢量首位相接的連續性檢測出運動的點目標.文中給出並證明應用本演算法能以概率1檢測到運動點目標的收斂性定理.對典型復雜背景下10幅1000幀圖像的模擬結果表明，當信噪比大於或等於1 . 5時，可以有效檢測出運動點目標
  11. However, there still exists correlation between coefficients of sub - matrices after 4d - mdct. this thesis proposes a four dimensional matrix video coding method based on context to get rid of the correlation between coefficient sub - matrices further. it includes three parts as follows : firstly, this thesis presents a four - dimensional matrix video encoder and decoder model, which contains components of prediction, transform and entropy coding

    實驗結果表明，該方法與傳統的二維編碼方法相比，具有高壓縮比和高圖象質量的優點;與矢量量化編碼相比，具有碼表體積小，計算復雜度低的特點;與霍夫曼編碼方法相比，在相同信噪比的條件下，對運動相對劇烈的視頻序列壓縮效果要更好。
  12. The traditional detection algorithm, based on zero - crossing or energy, will not acquire ideal effect when the signal - to - noise is low or the signal is weaker. therefore, to resolve the real problem in the real environment that all kinds of random noise and speech signal exit together, some new algorithm must be put forward. account for the complexity of real noise, we integrate the wavelet transform and high - order statistics and advance a new algorithm ; the algorithm can effectively separate the speech signal and the non - gauss noise

    基於過零率和能量的傳統檢測演算法，在噪聲環境比較復雜的情況下效果很不穩定，尤其是信噪比較低或者語音信號較弱時，檢測效果很不理想，因此，在多種語言和噪聲隨機出現、噪聲和語音強弱不一的實際噪聲環境下，必須利用新的演算法提取有用信號和噪聲信號的有效特徵，才能解決實際的問題。
  13. This dissertation analyzes the detection performance of dpca technique based on distributed spaceborne sar system, particularly analyzes the k - distributed clutter ’ s influence of the detecting results. 4. we compare the detection performance of ground moving target of the ati and dpca technique for the new model of distributed spaceborne sar in detail

    3 .分析了在不同信雜比、信噪比條件下以及不同目標方位向速度對dpca方法檢測性能的影響，特別研究了k分佈背景雜波干擾對動目標檢測性能的影響。
  14. ( 4 ) after factual characteristics of targets and clutter have been studied, an approach of radar signal detection based on factual has been given and analyzed deeply, the influence caused by different window length, signal to clutter ratio ( scr ) and clutter background has been analyzed, then the monte - carlo simulation method has been used to analyze the detection performances

    （ 4 ）研究了目標和雜波的分形特性，深入研究了基於分形的雷達信號檢測方法，分析了不同滑窗長度、不同信雜比和雜波背景變化情況對回波分形維數的影響，採用蒙特卡羅模擬分析該檢測器的性能。
  15. Based on the normal equation algorithm to fir system identification and wavelet iteration, a method to estimate the wavelet from the third - order cumulant of field data is developed. due to the fact that higher order cumulant retains the phase information of the signal, and can suppress the gaussian noise ( color or white noise ) naturally, we can improve the time resolution via inverse filtering the wavelet estimated

    本文在基於高階累積量的fir系統辨識基礎上，利用觀測信號的三階累積量對探地雷達子波進行估計，提出一種簡單的迭代演算法改善了波估計性能，據此進行反褶積，改善反射信號的信雜比和時間解析度。
  16. This paper studies target detection algorithms using polarimetric one - dimension range profile. at first by exploiting polarimetric information in different polarization channels, a fused and enhanced one - dimension range profile is obtained by pwf. then we can detect radar target through integration of scatters in different resolution cells or the number of detected scattering points

    首先利用不同極化通道的相關性信息，將各個極化通道的一維距離像通過極化白化濾波（ pwf ） ，抑制相關雜波，提高信雜比，融合得到一幅改善了的一維距離像，然後通過多個散射中心的能量徑向積累判定目標的有無。
  17. The autofocus algorithm not only need enough precision and computational efficiency, but also need fitting low signal to clutter rate ( scr )

    自聚焦除了要有足夠高的精度和高計算效率外，還要求能夠適應信雜比較低的情況。
  18. A modified shift - and - correlate ( sac ) autofocus algorithm is presented, which decrease the demand of scr and the algorithm is more robust

    文中對頻移相關演算法進行了改進，大大降低了自聚焦對信雜比的要求，增強了演算法的魯棒性。
  19. In the case of same local observation clutter power, based on the fusion rule proposed in [ 391, a novel method is proposed to solve the distributed system included any kind of lds by the property of laplace transform. this method overcomes the shortcoming of supposing the same local snr in other method. by computer simulation, some available conclusions are found based on these results

    在假設局部觀測雜波功率水平相同的條件下，針對文獻[ 39 ]提出的融合方案，利用laplace變換的頻域微分性質，提出了一種針對局部採用任意數量的不同cfar檢測器時系統的檢測概率和虛警概率關于固定門限的求取方法，克服了以往需要假設局部信雜比相同的缺憾。
  20. In the case of same clutter power in lds, based on the fusion rule proposed in [ 171 ], a novel method is proposed to solve the distributed system included any kind of lds by the property of laplace transform. this method overcomes the shortcoming of supposing the same local snr in other method

    在局部傳感器雜波功率水平相同情況下，針對文獻[ 171 ]中提出的融合方案，利用laplace變換的頻域微分性質，提出了一種針對局部採用不同cfar檢測器時系統的檢測概率和虛警概率關于固定門限的求取方法，並克服了以往需要假設局部信雜比相同的缺憾。
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