Analysis of mean function discrete LSM-estimator for biperiodically nonstationary random signals

Discrete estimators of the deterministic part for a biperiodically nonstationary signal obtained by the least square method (LSM) are analysed.It was shown that LSM-estimation allows avoiding the leakage effects.The conditions of consistency for the discrete estimators are obtained.The formulae for variance estimators, which describe their dependencies on a realization length, sampling interval and signal covariance components, are analysed.