Estimating Speed and Damping in the Stochastic Wave Equation
  A parameter estimation problem is considered for a one-dimensional stochastic wave equation driven by additive space-time Gaussian white noise.   The estimator is of spectral type and utilizes a finite number of the spatial Fourier coefficients of the solution. The asymptotic properties of the estimator are studied as the number of the Fourier coefficients increases, while the observation time and the noise intensity are fixed. 
W. Liu and S. V. Lototsky