Parameter mismatch estimation using large deviations from   synchronization
  We present a method to determine the relative parameter mismatch in a collection of nearly identical chaotic oscillators by measuring large deviations from the synchronized state. We demonstrate our method with an ensemble of slightly different circle maps. We discuss how to apply our method when there is noise, and show an example where the noise intensity is comparable to the mismatch. 
Jupiter Bagaipo, Juan G. Restrepo