Shmuel J Merhav

US Patent:

48705888, Sep 26, 1989

Filed:

Oct 21, 1985

Appl. No.:

6/789658

Inventors:

Shmuel J. Merhav - Palo Alto CA

Assignee:

Sundstrand Data Control, Inc. - Redmond WA

International Classification:

G01C 2110

US Classification:

364453

Abstract:

Disclosed is a method and apparatus for processing signals supplied by accelerometer assemblies in which one or more accelerometers are cyclically displaced in a predetermined manner so that signals representing the specific force experienced by the accelerometers and the angular rate experienced by the accelerometers are produced. The signal processor separately estimates the signal components of the signal being processed and provides an error signal by subtracting the estimated signal components from the signal being processed. The error signal is fed back through circuitry that controls the magnitude of the estimated signal components so that the value of each estimated signal component rapidly converges to the value of the signal components of the signal being processed. In an arrangement for determining the angular rate of one or more pair of cyclically displaced accelerometers, the signal processor includes a signal component that is in-phase with the signal that oscillates the accelerometer pair, a signal component that is in phase quadrature with the signal that displaces the accelerometer pair and a signal component that corresponds to random unmodulated additive noise. In this arrangement, a signal summing unit subtracts estimates of each signal component from the signal being processed to supply an error signal equal to (a. sub. 1 -a. sub. 1) Cos. omega. t+(a. sub. 2 -a. sub. 2) Sin. omega. t+(a. sub. 3 -a. sub.