AN ADAPTIVE SAMPLING ALGORITHM FOR REDUCING SPECTRUM LEAKAGE
Ma Renzheng,Chen Mingkai Fuzhou U niversity,Fuzhou35 0 0 0 2 ,China
The paper firstly introduces the concept of spectrum leakage and the reason for spectrum leakage.Then all the methods proposed to reduce the spectrum leakage are sum marized.When the sampling frequency is invariable,the fluctuation of the signal frequency will make the measurementof the harm onics less than its real value,at the same tim e the non- existent harm onics will be analyzed.Further,a new adaptive algorithm of equal angle- interval software synchronous sam pling is proposed. With the vector theory,the adaptive regulation of the sam pling frequency in software can be carried out through the harmonic analysis.Sim ulation results show the new algorithm notonly greatly reduces the spectrum leakage and improves the accuracy of harm onic analysis,but ensures its real time running with the powerful DSP,thus the restriction of the speed of DFT is resolved.Moreover,the algorithm will have great application potentials in the fields based on AC m easurem ent.
【CateGory Index】： TM935