1. A method of filtering a signal from a plurality of distributed sensors, comprising: obtaining the signal from the plurality of distributed strain sensors; selecting a first subspace of a measurement space of the obtained signal, the first subspace characterized by a step having a selected step size; estimating an error for a filter corresponding to the first subspace; adjusting the step size when the estimated error meets a selected criterion; selecting a second subspace characterized by a step having the adjusted step size; and filtering the signal by applying a filter corresponding to the second subspace.