Stanley A. White

Architecture for a digital programmable image processing element

A very high speed integrated circuit is required to perform a 3-pixel-by-3-pixel sliding window convolution over an image. To perform this on real-time video requires on the order of \frac{9 mult}{pixel} \times \frac{512^{2} pixels}{frame} or 71 × 106multiplies/sec. A device has been designed to perform 90 × 106multiply-accumulate operations/sec. using 8-bit input words and providing full precision output. Since the device can perform general vector multiplication, it is therefore useful for general digital filtering. Sets of devices may be used to increase accuracy or to chain together to form high-order FIR filters, This paper describes the algorithms and architecture used within the device.

Dynamics of a Solenoidal-Torqued Gyro-Stabilized Seeker Assembly for Guidance and Tracking

Several low-cost gyro-stabilized, bang-bang seeker assemblies for missile guidance and tracking applications have used similar physical structures. A magnetic dipole is an integral part of the gyro rotor assembly. The nominal spin axis of the gyro is colinear with the axis of a cylinder about which is wound a helix of wire. By properly modulating the current that is passed through that helix, the precession torque acting upon the gyroscope is controlled. One rather generalized model of such a seeker assembly is modeled, the equations of motion are derived, and the dominant error sources are identified and parametrically evaluated. Because this is such a commonly encountered structure, yet no such analysis has been published, to the authors knowledge, it is hoped that this is a useful contribution to the literature.

Dynamics of an Eddy-Current-Torqued Gyro-Stabilized Assembly

Prominent among the commonly encountered gyro-stabilized assemblies used in guidance and tracking are those which are eddy-current torqued. Although eddy-current-torquecd lead- computing gunsights, which use spinning mirrors, have been well known for thirty years, it has been difficult to find an analysis of the torques developed by the precession mechanism. In this paper a model configuration of the torquer is presented. The total gyro dynamics are then determined by including these torque terms in the model presented in the preceding paper.