Patent ID: 7536262
Filing Date: 2009-05-19
Classification: G01V

Abstract:
1. A method for tracking amplitude variations and phase changes of a transmitted periodic electromagnetic signal in noisy data detected over time by at least one receiver, said signal being transmitted at a known frequency, said method comprising the steps of: (a) selecting a tracking algorithm for tracking a signal of known frequency; (b) estimating initial values for the detected signal and at least one related parameter; (c) partitioning the detection time into intervals within each of which the detected signal and the at least one related parameter are assumed not to vary and assigning the estimated initial values to the first time interval; (d) estimating projection of the initial signal and each related parameter one interval ahead in time; (e) revising the initial estimates of step (d) using the data and the tracking algorithm; (f) repeating steps (d)-(e) until all data are processed.