A Novel Method for Estimating the Number of Signal and its Application in High Precision Frequency Measurement
Lichun Zhou, Xuegang Wang · Telecommunication Engineering · 2005
This paper introduces high precision digital frequency measurement,or Root Music algorithm.Analysis shows that the algorithm can get high precision value of frequency even in low SNR(0dB),and its frequency resolution is higher than DFT.However,to apply this method in electric reconnaissance,the key is to determine the number of receiving signal.According to the size distribution of eigen-value of the auto-correlation matrix,the MD(Mean of Difference) method is presented to determine the number of signal and its performance is better than MDL criterion.Computer simulations have verified the feasibility and robustness of the method.