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《Journal of Data Acquisition and Processing》 2011-04
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Improvement of High Dynamic Carrier Capture Based on Discrete Match Fourier Transform Algorithm

Zhu Liqing,Lu Huibin,Yi Xueding,Yang Xuefeng(Information Science and Engineering College,Yanshan University,Qinhuangdao,066004,China)  
The high dynamic carrier capture based on fast Fourier transform(FFT) is not applicable.Discrete match Fourier transform(DMFT) can be used in high dynamic signal.But it has poor precision and large calculation.A two-dimensional carrier capture algorithm is proposed based on the above analysis with the three combination of FFT,self-correlation and DMFT.Firstly,if-sampled signal and its delay make self-correlation,then the frequency variation rough estimate is abtained through FFT on the delay self-correlation,and the rough estimation of the initial frequency shift is obtained.After that,searching near the income value in DMFT obtain the high-precision parameter estimation.The method narrows the searching scope,reduces computation and improves the precision of estimation.The simulation results prove that the method is effective and feasible.
【CateGory Index】: TN911.7
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