Patent ID: 6216093
Filing Date: 2001-04-10
Classification: H03B,H04L

Abstract:
A method of generating a filtered combination of integrals of combinations of states of a system used in estimating a value of a parameter that describes a property of a signal from a source, comprising a combination of circuit elements wherein each circuit element is an analog of one of a plurality of mathematical integrals of said filtered combination of integrals, the method comprising the steps of:a. defining a system that models the source of the signal, wherein the system is described by various states that evolve with respect to time;b. partitioning the system into a first subsystem that contains the parameter and a second subsystem that does not contain the parameter, the second subsystem including a term so as to make the second subsystem stable and synchronizable with the signal;c. introducing the signal as input to the second subsystem;d. substituting at least one state of the second subsystem into at least one corresponding state of the first subsystem, thereby generating a signal-activated subsystem;e. introducing an integration factor of the signal-activated subsystem to the signal-activated subsystem so as to cause the parameter to behave as a constant when the signal-activated subsystem with the integration factor is integrated with respect to time;f. integrating with respect to time the signal-activated subsystem with the integration factor, thereby generating an equation of integrals of combinations of states of the first subsystem in which the parameter is brought out of any of the integrals containing the parameter;g. solving the equation of integrals for the parameter so that a term proportional to the parameter is expressed as a combination of integrals derived from the equation of integrals; andh. applying the combination of integrals as an input to an equation for a low-pass filter so as to inhibit any singularities in the combination of integrals, thereby generating a filtered combination of integrals.