Abstract:The basic principle of FM-CW radar level gauge is analyzed briefly. A method of estimating its frequency difference is proposed based on 2''-point discrete Fourier transform (DFT) and interpolation. The frequency estimation includes two steps, called coarse-estimation and fine-estimation, both of which are based on 2"-point DFT. As a result, the method is applicable to estimate a frequency under serious noise background where signal-noise-ratio (SNR) is as low as -32dB. Simulation results show that the method … Show more
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