bispectrum 中文意思是什麼
bispectrum
解釋
雙頻譜-
The method of detection on transient signal by the slice of cyclo - bispectrum in stationary random noise is proposed in this paper, simulation results are presented also
摘要提出一種在平穩隨機噪聲中檢測暫態信號的循環雙譜切片方法，同時給出模擬結果。 -
Fault diagnosis for gear based on bispectrum analysis
基於雙譜分析的齒輪故障診斷研究 -
Application of bispectrum estimation to analyzing pulse signals
雙譜估計在中醫脈象信號分析中的應用 -
Evaluating wave speed in concrete by bispectrum based time delay estimation
基於互雙譜的應力波波速估計的研究 -
Misfire detection for tank diesel engine based on exhaust noise bispectrum analysis
基於排氣噪聲雙譜分析的坦克柴油機失火檢測 -
Joint analysis of radiated noise from underwater vehicles based on wavelets and bispectrum
水下目標輻射噪聲的子波變換和雙譜聯合分析 -
Bispectrum based feature extraction and classification of radiation noises from underwater targets
基於雙譜的水下目標輻射噪聲的特徵提取與分類研究 -
The method of bispectrum can extract characteristic of seismic series bispectrum and detect fracture zones by decreasing dimensions
雙譜法通過採用模式識別的方法對地震序列的雙譜提取特徵，通過降維實現裂縫發育帶的檢測。 -
Wavelet packet transform is used to improve the snr of the incoherent integral radar echo, and bispectrum algorithm is used for signal detection in this united detecting algorithm, based on the modeling for the through - wall radar echo
在對穿墻雷達回波信號建模的基礎上，用聯合演算法將非相干累積后的回波信號經過小波包變換提高信噪比，再用雙譜演算法進行信號檢測。 -
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。 -
Then analyze typical noises of the network based on bispectrum, get the wave characteristics according to bi - coherence function, and carry on the clustering analysis based on self - organizing feature mapping, so it realizes the clustering identification of the typical noises of medium - voltage power line
而後對電網的典型噪聲進行雙譜分析，並通過雙相干函數提取其波形特徵，利用自組織特徵映射神經網路進行類聚分析，從而對特定中壓配電網的各種電網噪聲干擾進行分類識別。 -
The reassigned smoothed pseudo wigner - ville distribution ( rspwvd ) is introduced, which has less interference and higher resolution than other time frequency distributions like wigner - ville, choi - williams etc. it is used to detect the multi - knocking of engine such as cylinder, piston pin, valve, crank bearing, connecting rod bearing and jib knocking. a new fault diagnosis technique based on the rspwvd for the engine multi - knocking problem is proposed. by comparing the bispectrum and bicoherence of the gear vibration signals, it is demonstrated that bispectrum has an advantage over bicoherence for feature extraction of such signals
第四章首次引入一種重分配方法，得到干擾項少而解析度高的重分配平滑偽魏格納維爾分佈（ rspwvd ） ；對發動機曲軸主軸承響、連桿軸承響、活塞銷響、活塞敲缸響、氣門響和挺桿響等常見機械異響故障振動信號特徵進行了全面地比較分析；通過對各種異響故障特徵信號的分析研究，提出基於rspwvd的發動機多異響故障診斷策略，利用該策略可以準確識別不同的發動機異響故障。 -
In this study, based on bispectrum and bicoherence extraction of vibration acceleration signals at spindle end of a vertical machining center while milling operation, change rules of bispectrum and bicoherence of the signals were analyzed for the progressive wearing process of the flank wear land of the milling cutters
通過提取銑削加工過程中機床主軸端振動加速度信號的雙譜及其雙相干系數，分析了銑刀后刀面漸進磨損過程雙譜及其雙相干系數的變化規律。 -
The ship radiated noise is analyzed and its 4 features are extracted from the envelop spectrum. the envelope of ship noise waveform can be demodulated utilizing hilbert transform, and the spectrum components with line rotation frequency of propeller shaft are extracted effectively by bispectrum, 1 ( 1 / 2 ) spectrum and 2 ( 1 / 2 ) spectrum analysis
對于通過希爾伯特變換解出的艦船輻射噪聲包絡信號進行高階統計量分析，有效地提取出了艦船噪聲的雙譜、 11 / 2維譜、 21 / 2維譜等方面的特徵。 -
Radar target recognition by a logarithm bispectrum - based method is simulated and studied. it is discovered that the more test samples that generate the subrangeprofile of logarithm of averaged bispectrum are, the higher recognition rate is. and using phase information is a key to obtaining high recognition rate. all of these methods are proved by experiments on simulated data and real data of planes
4 、對基於對數雙譜特徵的目標識別法進行模擬實驗，研究了該演算法的識別性能和用於求雙譜平均對數子像的測試樣本數之間的關系，該測試樣本數越多識別率越高，同時研究表明利用相位信息是該演算法得到較高識別率的關鍵。 -
This paper introduces a bispectrum - based channel estimation algorithm to improve the accuracy of the channel estimation at pilots and proposes an equalization method with the view of the reduction of the interpolation error
為了提高通道估計的精度，本文分別從提高導頻處通道估計精度和減小插值誤差的角度出發提出了基於導頻雙譜的通道估計演算法和基於變換域濾波的插值方法。 -
To overcome the affection of ici and awgn on the ls estimate of the transfer function at pilot tones, the proposed bispectrum - based channel estimation algorithm employ the suppression of ici and awgn components in the received pilot signals by bispectrum and then the accuracy of the estimation is improved. with the channel estimation at pilot tones, an efficient interpolation is necessary. an improved interpolation method based on transform - domain filtering is proposed, which employs dft / idft and filtering in a transform domain so that the effect of noise on the equalization is significantly reduced
針對導頻處通道傳遞函數的ls估計中存在載波間干擾和加性高斯白噪聲的影響的這一問題，本文將傳統的ls估計方法與雙譜相結合提出了一種新型的基於導頻雙譜通道估計演算法，它利用了雙譜對高斯噪聲的抑制作用來減小接收到的導頻信號中的載波間干擾和加性高斯白噪聲的影響，從而提高了導頻子載波上通道估計的精度。 -
This paper studies the helicopter, the propeller - driven aircraft and the turbofan jet airplane echo modulating feature parameter model and analyses the echo signal feature. it gains the target echo ’ s the cyclical modulation feature by using the complex ar frequency range bispectrum slice. because traditional method in extraction airborne radar ’ s radiant signal feature time has certain insufficiency, this paper proposes the approximate entropy and the norm entropy as the passive feature parameter in the airplane
由於傳統方法等在提取機載雷達輻射源信號特徵的時候存在著一定的不足，本文提出把近似熵和范數熵作為飛機目標識別的無源特徵參數，給出了提取相應特徵熵的演算法，實現對機載雷達輻射源信號的識別，通過和機載雷達類型的匹配，實現對目標的識別。 -
The method of bispectrum reconstruction detects fracture zones by learning the difference of frequency components because fracture can change the frequency components of seismic responses. the theory of time - frequency analysis computes the difference in the gradient direction of time - frequency spectrum
雙譜重構的方法就是根據裂縫會改變地震波頻率成分的基本想法，通過求取具有不同頻率成分的地震波的差異來實現對裂縫發育帶的檢測的。
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