US Government As Represented by the Secretary of the Army

James W McKelvy

Walter E Miller, Jr

The discriminator consists of two major parts; a nonlinear filter for low vel rejection, and inhibiting logic for high level rejection, of ac magnetic fields. The nonlinear filter approximately halves the frequency characteristics of a particular class of signals, while at the same time doubling the frequency of normal interfering signals. The inhibiting logic uses the known in-phase relationship to sense and reject even very large time dependent interference. However, spatially variant signals observed from near field relative motion of two orthogonal magnetic sensors with respect to a ferro-magnetic object have a near quadrature relationship that permits signal recognition even when of less amplitude than the interference.

Power line field interference rejection for magnetic sensors

An open loop reduction in gunner aiming error is provided by a rate gyro dback to the missile command electronics. The low frequency movements are filtered out of the feedback circuit; permitting tracking of low frequency crossing targets, while eliminating higher frequency gunner jitter inputs.

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Huntsville, AL, United States of America

James W McKelvy