Non-uniform sampling consists in introducing a jitter in an angular sampling position. This jitter is random and different for every position. This jitter can be caused physically by some inaccuracies in position sensor measurements. Sampling a time domain relative signal against the angle can also be viewed as a non-uniform sampling. In this case the jitter is caused by speed fluctuation (constant speed case). Non-uniform sampling introduces an additional noise (that can be cyclostationary at order 2 if the original signal is cyclostationary at order 1). Non-uniform sampling also acts as a low pass filter. Its cut-off frequency depends on jitter standard deviation.
An experimental bench was built. This bench uses a synchronous data acquisition board, an arbitrary generator, and a non-uniform clock generator. Experimentations are performed using various jitter values (from 0.1% to 20%) and are corroborated by previous theoretical studies.