space frequency 中文意思是什麼
space frequency
解釋
空號頻率-
The structure of the testing platform is described, and the experiment content and principles are given in detail. the transmission error curves and space frequency curves are emulated. the circuits of rotor part and software are finished
本文介紹了實驗臺的整體結構，實驗內容的設置和各實驗的工作原理，模擬了傳動誤差曲線及其空域頻譜圖，詳細闡述了轉子測量的電路設計、下位機程序設計和上位機的軟體設計。 -
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。 -
At first some modification is made in conventional beam forming of frequency domain, namely to estimate doa by arrays outputs on compensated spacial frequency points of echoes. then the cwt is utilized to signal processing in space - frequency domain for estimation of doa, and the corresponding modification is also made. in the dissertation, the computer simulations of doa estimation for both narrow - band and wide - band echoes are given, so do the necessary comparison among several methods and crb
首先在傳統的頻域波束形成演算法的基礎上，提出對寬帶信號的頻率補償，也即對寬帶回波信號的各空間頻率根據時間頻率的差異進行相應補償，然後對各陣元輸出求和來得到方位估計；其次將連續小波變換引入到空間?頻率處理中，從而完成對目標方位的估計，並進行了相應地補償。 -
Based on the propagation law of the cross - spectral density function in the space - frequency domain, the properties of polychromatic vector gsm beams through a paraxial optical abcd system are studied. the analytical propagation expressions for the cross - spectral density matrix of vector gsm beams passing through a paraxial optical abcd system are derived, which permits us to study the propagation properties of vector gsm beams, including the propagation - induced polarization changes, effect of the spectrum bandwidth and irradiance distributions in a unique way. there are some applications of the theoretical results
基於空間一頻率域中交叉譜密度函數的傳輸理論，研究了多色矢量gsm光束通過abcd光學系統傳輸時偏振特性的變化規律，首次推出了矢量高斯一謝爾模刑fgsm ）光束通過近軸abcd光學系統交叉譜密度矩陣的傳輸公式，並對矢量gsm光束傳輸中偏振的變化、譜寬的影響和強度的分佈等進行了統一研究。 -
Iterative decoding of space frequency block code ofdm systems
系統迭代解碼演算法 -
This dissertation put forward a method of eliminating noise and reconstituting broken wires signal and inquired the space - frequency range of the signal ripple resulted from tensile stress on the mfl signal curve
提出了去除干擾重組斷絲信號的方法，分析了漏磁曲線上應力波紋的空間頻率分量。 -
The algorithm, basing on convolution filtering technique and the fringes " gray values max - min distribution, can automatically and accurately carry out space frequency spectra shifting without spectra analysis and spectrogram in the technique of phase method of projected grating for 3 - d object shapes measurement. the new algorithm makes image processing much caster and the technique of object shapes measurement more automated. the phase error caused by filtering and the crossed - optical - axes geometry setup is also discussed
本文採用投影光棚相位法和數字卷積濾波技術：根據柵線的條紋灰度值分佈具有極大極小分佈的特性，提出卷積濾波形貌光學自動檢測的圖像處理方法，有效地實現了頻譜自動移位，從而進一步提高了圖像處理的速度和形貌測量技術的自動化程度；同時對採用兩光學主軸相交，且非遠心投影系統所產生的誤差進行了分析，並提出了修正方法。 -
2 ) the concept of space frequency distribution is introduced into reevaluation of incoherently distributed source model. based on the model, two low - complexity robust bearing estimators are developed. it is proved theoretically that their estimates are asymptotically unbiased and consistent
2 ）從空間頻率分佈的角度重新評價了非相干分佈源模型，提出了兩種低計算復雜度的穩健的分佈源波達方向估計器，並從理論上證明了它們的漸近無偏性和漸近一致性。 -
The circumference mfl of the wire rope has a broad space - frequency range along the axial of rope
鋼絲繩周向漏磁信號沿繩長有豐富的空間波動頻率成份。 -
In order to investigate the phenomenon that holograms tend to be deteriorated on baing recorded in photopolymers with shrinkage, a fourier hologram is taken with slant gratings formed by the reference beam and object beams of different space - frequency
摘要為了分析光致聚合材料記錄的譜面全息圖在再現過程中發生「擦除」現象，將譜面全息圖看作由不同角譜的物光與參考光在光致聚合材料內形成的不同傾斜角度的光柵總和。 -
The innovations of this thesis are as the follows : 1 ) it is analyzed that the lower - order jacobi - anger expansion model for an incoherently distributed source has better accuracy performance than some other approximate source models such as space frequency model, two - point source model, and low - rank approximate model. using the parametric decoupling property of the ja - based model, a novel angular parameter estimator is proposed, which is very robust in case of large angular spreading
本文從這三個方面開展了空間分佈源波達方向估計研究，創新點包括： 1 ）分析了低階jacobi - anger級數展開近似模型的誤差性能；利用該近似模型的參數解耦特性，提出了一種新的波達方向估計器，在大角度擴展條件下，該估計器表現非常穩健。 -
Based on the analysis of image wavelet transformation and the space / frequency distributing characteristics of different subbands " coefficients, this dissertation fully exploits the following theories and methods : scalar quantization, vector quantization, trellis coded quantization, trellis coded vector quantization, vector classification, codebook expansion and weighted mean square error rule basing mankind visual characteristics, etc. from different angles of information amalgamation, it develops several innovative algorithms of image compression and coding, gives their realization schemes, and makes plentiful simulation tests
本文在分析了圖像小波變換的原理和子帶系數空間及頻率分佈特點的基礎上，充分利用標量量化、矢量量化、網格編碼量化、網格編碼矢量量化、矢量分類、碼書擴展和基於人眼視覺特性的加權均方誤差準則等思想和方法，從信息融合的不同角度展開了對小波圖像的壓縮編碼研究，同時也討論了這些方法在靜止圖像量化中的具體應用。 -
Novel joint iterative channel estimation and space - frequency decoding algorithm for sfbc - ofdm systems
系統中聯合迭代通道估計與空頻解碼演算法 -
With the characteristics of large ambient noise, very narrow bandwidth, low carrier frequency, great propagation latency and time - space - frequency variant multipath effect ( mpe ), the stochastic ocean channel has demonstrated the greatest complexity and difficulty for underwater acoustic wireless communications. among them multipath effect ( mpe ) is the most difficult obstacle that results in signal fading and inter - symbol interference ( isi )
但是噪聲高、帶寬窄、載波頻率低、傳輸時延大、多途徑效應隨時間?空間?頻率變化等通道特性都會給有效、可靠的水聲通信帶來很大的麻煩，其中多途徑效應是最主要的困擾因素，它會導致信號幅度衰落和碼間干擾。 -
This paper introduces the basic principles of mimo - ofdm technology briefly, and focuses on the research on the space - frequency coding, receiver design, multiuser systems and some relevant open areas for the further research
簡要介紹了mimo - ofdm技術的基本原理，重點討論了空頻編碼、接收機設計、多用戶系統等方面的研究現狀以及未來研究的領域。 -
The basic concepts of second - order coherence theory in describing wavefields are introduced. these concepts are the cross - spectral density function and spectral degree of coherence in the space - frequency domain, and the mutual coherence function and the complex degree of coherence in the space - time domain
介紹了二階相關理論中描述光場相干性質的基本概念，包括空間-時間域中的互相關函數、復相干度和空間-頻率域中的交叉譜密度函數、光譜相干度。 -
A novel design of ofdm - based space - frequency codes is proposed such that the maximum achievable diversity gain is available
摘要提出了一種基於ofdm達到最大可達分集增益的空頻碼設計方案。 -
Using the feature : there exists distinct edge contour between the characters and the background in color image, we give a color image text extraction algorithm - tea ( text extraction algorithm ), which makes the use of cedo to process edge detection of color image, then, adopts morphologic dilation technology to form region image, and combines the area - growth algorithm to mark the candidate text blocks, finally, determinates the correct text block by analyzing the density of text block and the space frequency feature
利用彩色圖像文本區域與背景之間存在明顯邊緣輪廓的特點，本文給出了彩色圖像文本提取演算法? tea （ textextractionalgorithm ） 。該演算法首先利用cedo進行彩色圖像邊緣檢測，然後採用形態學膨脹技術生成區域圖像，並結合區域生長演算法標記候選文本塊，最後通過分析文本塊密度和空間頻率特性來判定真正的文本塊，從而較好地完成了彩色圖像的文本提取。 -
Methods in space / frequency domain : a group of gabor filters are used in texture - based image retrieval ; by analyzing how the energy changes with the decomposing of wavelet, tree - structured wavelet transform in texture - based image retrieval is selected to use. as for similarity measurement of texture - based image retrieval, this paper demonstrates two data models related to the similarity measurement and proposes two kinds of multi - feature combination structures
在空間頻域聯合的方法中，將構造的一組gabor濾波器用於圖象紋理檢索；通過分析紋理圖象經過小波分解后的能量變化特點，提出了選用樹型小波分解方法用於紋理檢索，提高了檢索的有效性。 -
Besed on wavelet " s well localized characterizes in time frequency and space frequency, we can exactly depict events of nonnoise by decomposing to signal using binary - wavelet transform. for events of noise, local max can be found at singular points of signal by using wavelet transform norm of signal, so adopting multiscale wavelet analysis the maximal point of wavelet transform norm, which risen by the noise, with increasing of scale, which rien by the fault appeared. gived a properly threshold and compared the relation of data that have been transformed not only find the fault in the low noise signal but also resume the signal by filtering noise, which have good power of examining singular signal being unexpectedly change
對于噪聲中的事件點，利用信號的小波變換的模在信號的突變點取得局部最大值，採用多尺度（多分辨）小波分析，則隨著尺度的增大，噪聲引起的小波變換模的極大值點迅速減少，而故障引起的小波變換模的極大值點得以顯露，我們給出一個適當的閥值，比較閥值和變換后數據的關系，不但可以在低信噪比的信號中監測到故障信號，而且可以濾去噪聲恢復原信號，對突變的奇異性信號具有良好的監測能力，能夠有效地找出噪聲中的事件點。
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