signal spectral density 中文意思是什麼
signal spectral density
解釋
信號頻譜密度-
The optimized experimental conditions are determined and the densities of some elements in the mental alloy standard samples are measured. the experimental results shows that the spectral intensity of the plasma enhances significantly with the increase of the operating voltage and the power density. ( 1 ) to the steel ally sample, the emission intensities of the spectra reach to the maximum values when the laser operating voltage is 1600v and the argon pressure is 600 torr. under the same pressure, the spectral intensity of the plasma in the argon atmosphere is stronger than that in the air. when the argon pressure is 320 to rr, the signal - noise ration is about 5 times than that which the argon pressure is 700 torr, but the temperature of plasma is less about 1000k
（ 1 ）對于光譜標鋼準樣品，當激光器工作電壓為1600v 、氬氣壓力為600乇時，譜線強度達到最大，並且在相同壓強下，氬氣中的等離子體與空氣中的等離子體相比，其輻射強度明顯增強；氬氣壓力為320乇時的譜線信背比約為600乇條件下的5倍，而等離子體溫度卻下降了近1000k ，即等離子體溫度隨環境氣壓的增大而增大；當激光束的焦斑在樣品表面上下移動時，激光誘導量、等離子體的激發溫度、譜線強度都呈不對稱性分佈，其最大值對應的焦斑位置都位於樣品表面之下0 . 4mm左右。 -
A random signal of known statistical properties of amplitude, distribution, and spectral density
振幅、分佈及譜密度等的已知統計特性的隨機信號。 -
Testing the vibration acceleration signal of rail top ( lateral and vertical ), rail middle ( lateral ), rail bed side ( vertical ) and rail bed middle ( vertical ) with dasp vibration testing system, calculation of signals obtains the power spectral density and frequency response curves of different position
測試橫向和垂向激振力下鋼軌不同部位的振動信號，進行頻譜分析，得出不同部位的頻率響應曲線。通過對頻響曲線的分析，得出不同方向激振力下鋼軌振動能量集中的頻率，確定不同方向激振力下鋼軌的主要振動部位和振動形式。 -
The virtual digital signal processing instrument is developed with vc + + 6. 0 and matlab 6. 0 in windows 98. the system has realized signal generator, signal ' s sampling and averaging function, signal ' s power spectral density and cross special density analysis, the design and application of digital filter, signal analysis in time, frequency and inverted frequency domain
該系統的工作環境為windows98 ，開發工具為visualc + + 6 . 0和matlab6 . 0 。實現了波形發生器的設計、信號採集及平均處理、濾波器的設計及應用、信號的時域、頻域以及倒頻域分析。 -
Moreover, close - form expressions for the power spectral density and acpr of cdma signal passed through a nonlinear power amplifier are derived using the power series and statistical model of cdma signal. the comparison computer between algorithm simulation and practical data or experimental data derived using ads proves the validity
同時基於cdma信號的時域數學模型和功率放大器的冪級數模型，具體推導出cdma信號的功率譜密度和acpr的數學表達式，並將其演算法模擬結果與實測結果以及ads實驗模擬結果相比較，驗證其正確性。 -
The paper analyses the signal processing with emphasis on signal to noise ratio ( snr ) in output of correlator and snr in signal power spectral density
並對演算法處理中相關器輸出中的信噪比（ snr ）和功率譜密度中的snr進行了重點分析。 -
The spectral correlation density must be estimated before the ds signal parameter estimation. in order to reduce the effect of random noise, we provide a improved method to estimate the spectral correlation density which is based on the average algorithm. it can make the spectral line be more obvious, and improved the snr limit when estimating these parameters
在利用ds信號譜相關域所表現的特徵進行參數估計時，首先要利用有限時間數據對ds信號進行譜相關密度估計，為降低隨機噪聲對譜相關密度估計的影響，本文引入了集平均的思想，提出採用集平均的方法估計譜相關密度，從而在參數估計時，特徵譜線更顯著，提高了參數估計的信噪比容限。
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