宇航计测技术
宇航計測技術
우항계측기술
JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT
2014年
1期
19-24
,共6页
液体密度测量%谐振式传感器%频率解算%FFT算法%窗函数
液體密度測量%諧振式傳感器%頻率解算%FFT算法%窗函數
액체밀도측량%해진식전감기%빈솔해산%FFT산법%창함수
Liquid density measurement%Resonant sensor%Frequency calculation%FFT algo-rithm%+Window function
为实现高精度测量谐振式液体密度传感器的输出信号频率,在现有的FFT频率解算理论基础上,引入更符合实际情况的加窗插值FFT频率解算方法,并分析频率变化以及噪声对解算结果的影响。通过Matlab仿真实验对该方法中常用的窗函数进行对比分析,最终选择加入Rife_Vincent窗的插值FFT算法作为输出信号频率的解算方法,并在所设计的硬件系统上进行了实验验证,结果表明,采用加Rife_Vincent窗的插值FFT算法解算传感器输出信号的频率,其解算误差小于0.1Hz,解算精度高且易于实现。
為實現高精度測量諧振式液體密度傳感器的輸齣信號頻率,在現有的FFT頻率解算理論基礎上,引入更符閤實際情況的加窗插值FFT頻率解算方法,併分析頻率變化以及譟聲對解算結果的影響。通過Matlab倣真實驗對該方法中常用的窗函數進行對比分析,最終選擇加入Rife_Vincent窗的插值FFT算法作為輸齣信號頻率的解算方法,併在所設計的硬件繫統上進行瞭實驗驗證,結果錶明,採用加Rife_Vincent窗的插值FFT算法解算傳感器輸齣信號的頻率,其解算誤差小于0.1Hz,解算精度高且易于實現。
위실현고정도측량해진식액체밀도전감기적수출신호빈솔,재현유적FFT빈솔해산이론기출상,인입경부합실제정황적가창삽치FFT빈솔해산방법,병분석빈솔변화이급조성대해산결과적영향。통과Matlab방진실험대해방법중상용적창함수진행대비분석,최종선택가입Rife_Vincent창적삽치FFT산법작위수출신호빈솔적해산방법,병재소설계적경건계통상진행료실험험증,결과표명,채용가Rife_Vincent창적삽치FFT산법해산전감기수출신호적빈솔,기해산오차소우0.1Hz,해산정도고차역우실현。
In order to increase the accuracy of frequency calculation for the density sensor based on the resonance theory, interpolated Fast Fourier Transform algorithm ( FFT) algorithm which is based on the existing FFT and more adjusts the actual situation is introduced. The effect of frequency changes and the noise on results of frequency calculation is also analyzed. Comparative analysis for the commonly used windows is made through Matlab, and Rife_Vincent window is chosen finally. In addition, experiments have been carried out on the hardware system designed. The experimental results confirm that the calcu-lation error is less than 0. 1 Hz by means of the interpolated FFT algorithm with Rife_Vincent window. The results also test and verify that the method has very high accuracy and is easy to realize.
