# Estimation - parametric estimation functions

DSP.Estimation.espritFunction
esprit(x::AbstractArray, M::Integer, p::Integer, Fs::Real=1.0)

ESPRIT [Roy1986] algorithm for frequency estimation. Estimation of Signal Parameters via Rotational Invariance Techniques

Given length N signal "x" that is the sum of p sinusoids of unknown frequencies, estimate and return an array of the p frequencies.

Arguments

• x::AbstractArray: complex length N signal array
• M::Integer: size of correlation matrix, must be <= N. The signal subspace is computed from the SVD of an M x (N-M+1) signal matrix formed from N-M+1 length-M shifts of the signal x in its columns. For best performance for 1 sinusoid, use M = (N+1)/3 (according to van der Veen and Leus). For faster execution (due to smaller SVD), use small M or small N-M
• p::Integer: number of sinusoids to estimate.
• Fs::Float64: sampling frequency, in Hz.

Returns

length p real array of frequencies in units of Hz.

source
• Roy1986R Roy, A Paulraj and T Kailath, ESPRIT - A subspace approach to estimation of parameters of cisoids in noise, IEEE Trans. Acoustics, Speech, Signal Process., 34, 1340-1342 (1986). url.