1.Military Logistics Department, Army Logistics University of PLA, Chongqing 401311, China;
2.Department of Equipment Support, Logistics College of CAPF, Tianjin 300309, China
Abstract:To suppress the influence of negative frequency component of a damp real-value sinusoidal signal on parameter estimation, a real-to-complex-transformation parameter estimation algorithm is proposed. First, the index number bin of spectrum of sampled signal with the highest magnitude is pre-estimated. Second, the reference signal that only contains negative frequency component is constructed, and the real-value signal is converted into a complex-value signal by subtracting the reference signal form the sampled signal to suppress the spectrum leakage influence of the negative frequency component. Then, the coarse frequency offset, damping factor and complex amplitude are estimated by a two-point spectrum interpolation algorithm, and the reference signal and the complex signal are rebuilt. Finally, the signal parameters, i.e. frequency, damping factor, initial amplitude and initial phase are obtained by an iterative procedure. The results of simulation experiments for frequency estimation indicate that the proposed method can eliminate the influence of negative frequency component, improve estimation accuracy under medium or high SNRs, especially, the signal frequency is low, and improves the overall performance of frequency estimation. Moreover, the measurement experiments are performed on Coriolis mass flowmeter, and the efficacy of the proposed method is validated.
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