Two-dimensional spectral estimation method with input-dependent FIR prefiltering

An approach to 2-D spectral estimation that involves input-dependent finite impulse response (FIR) prefiltering is proposed. This approach is an iterative method in which the design of a 2-D zero-phase FIR filter and the operation of spectral estimation are sequentially performed. Although the authors use the periodogram for the purpose of calculating the power spectrum, an introduction of the input-independent prefiltering leads to high spectral resolvability and reduced estimation variance. The computational time wasted on this approach is moderate, since one can iteratively utilize the computational efficiency of the 2-D fast Fourier transform algorithm. The effectiveness of the spectral estimation method is shown by computer simulations