Quick and high-precision frequency spectrum correction interpolation algorithm

• Main Authors: SU ZUQIANG, LI RUI, ZHENG KAI, LUO JIUFEI, XU HAITAO, XIAO HONG
• Format: Patent
• Language: Chinese; English
• Published: 20.10.2017
• Subjects: MEASURING; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; METERING BY VOLUME; PHYSICS; TESTING

The invention provides a quick and high-precision frequency spectrum correction interpolation algorithm. The quick and high-precision frequency spectrum correction interpolation algorithm comprises the steps of using a signal collector to sample signals; performing windowing preprocessing on the collected signals; supplementing a zero value with the same length after the preprocessed signals; calculating a Taylor series coefficient related to an added window function; obtaining an amplitude ratio through Fourier transform, and further obtaining coarse estimated frequency value and a refined estimated value after iteration once. The quick and high-precision frequency spectrum correction interpolation algorithm has the advantages that 1 the method breaks through limitation of the interpolation algorithm depending on the window function, and the method is applicable to any window function; 2 for different window functions, system errors of the algorithm are smaller than 10 , and even if the signals are disturbed