Patent Document ID: 8378816
Application ID: 12668768
Patent Flag: 1

Claim One:
1. A method for assessing dynamic system similarity, said method comprising the following steps: providing at least one multivariate test signal associated with an operational system; providing at least one multivariate reference signal associated with the operational system; comparing the signal similarity of the second-order moment of the at least one multivariate test signal with the second-order moment of the at least one multivariate reference signal; establishing a selected threshold level defining a maximum allowable deviation for the signal similarity of the second-order moments of the at least one multivariate test and reference signals; determining when the signal similarity of the second-order moments of the at least one multivariate test and reference signals fails to remain within the selected threshold level; and providing output to a user indicating instances when the selected threshold level is exceeded; wherein said step of comparing the signal similarity is performed using time-domain processing techniques and more particularly comprises the steps of: calculating the auto-covariance matrix functions for the at least one respective multivariate test and reference signals; calculating the covariance of the auto-covariance of the at least one multivariate reference signal; generating a test statistic using in part the calculated auto-covariance matrix functions for the at least one respective multivariate test and reference signals and the covariance of the auto-covariance of the at least one multivariate reference signal; determining when the test statistic crosses the selected threshold level.