A Method For Fine Resolution Frequency Estimation From Three DFT Samples

doi:10.1109/LSP.2011.2136378

2011-06-01

268

PRE

Çağatay Candan *

DOI：10.1109/LSP.2011.2136378

原文链接

原文求助

摘要

En 中文

The parameter estimation of a complex exponential waveform observed under white noise is typically tackled in two stages. In the first stage, a coarse frequency estimate is found by the application of an N-point DFT to the input of length N. In the second stage, a fine search around the peak determined in the first stage is conducted. The method proposed in this paper presents a simpler alternative. The method suggests a nonlinear relation involving three DFT samples already calculated in the first stage to produce a real valued, fine resolution frequency estimate. The estimator approaches Jacobsen's estimator for large N and presents a bias correction which is especially important for small and medium values of N.

Keyword:

Frequency estimation

fine doppler estimation

radar signal processing

DFT