document: On-line robust processing techniques for elimination of measurement drop-out When processing measurement data , it is usually assumed that some amount of normally distributed measurement noise is present . In some situations , outliers are present in the measurements and consequently the noise is far from normally distributed . In this case classical least-squares procedures for estimating Fourier spectra -LRB- or derived quantities like the frequency response function -RRB- can give results which are inaccurate or even useless . In this paper , a novel technique for the on-line processing of measurement outliers will be proposed . Both the computation speed and the accuracy of the technique presented will be compared with different classical approaches for handling outliers in measurement data -LRB- i.e. filtering techniques , outlier rejection techniques and robust regression techniques -RRB- . In particular , all processing techniques will be validated by applying them to the problem of speckle drop-out in optical vibration measurements -LRB- performed with a laser Doppler vibrometer -RRB- , which typically causes outliers in the measurements
doc_bio_tags: O O O O O O O O O O O O O O O O O O O O O O B I I I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O B I I O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O O O O O O O O O O O O O O B I O B I I O O O O B I I O O O O O O O O O
extractive_keyphrases: normally distributed measurement noise fourier spectra frequency response function measurement outliers computation speed speckle dropout optical vibration measurements laser doppler vibrometer robust regression
abstractive_keyphrases: on-line robust processing techniques measurement dropout elimination classical least-squares procedures laser interferometer modal analysis vibration velocity iterative technique low-pass filtering median filtering signal sampling order statistics sinusoidal excitation broadband excitation frequency spectra