CATS Software


  • CATS is a program to use Maximum Likelihood Estimation to fit (via weighted least squares) a multi-parameter model to a time series (such as continuous GPS) while simultaneously analysing the data to assess the type and magnitude of the noise contained in the series. The program solves for all-parameters in a two-part procedure; the linear part includes an intercept, a slope, the possibility of abrupt steps (as from earthquakes) and any known periodicities (for example annual), while the non-linear part allows the parameters and amplitudes of several specific noise models to be estimated. For more information see the relevant publications and pdf files below.