A method and system for use in detection of a periodic signal are described. The method comprising: providing data about periodicity of the periodic signal； sampling said periodic signal at a sampling rate along a plurality of periods of said signal, said sampling rate being selected as having temporal location of at least one sampling event along a corresponding period thereof varies for each period for a desired number of the periods； arranging sampled data pieces in accordance with sample time thereof with respect to time within a period of said periodic signal； and reconstructing a profile of said periodic signal from said plurality of periods being sampled at a desired resolution being greater than resolution associated with said sampling rate. The variation in temporal location of sampling event may be provided by proper selection of sampling rate, or by varying time of sampling rate in accordance with the period of the periodic signal.
