An optical tracking apparatus incorporating a radar system to search, acquire and track a co-operating target. A YAG laser illuminator and a tracker which are mounted together at a ground installation cooperate with small retroreflectors mounted on the target to pinpoint its position. The optical signals which are received from the target are processed in optical system detectors. The detectors provide target azimuth and elevation information.

A tracking means for maintaining a flexible endless belt filter media in proper alignment on its rollers. One of the rollers includes a center section of constant diameter, approximately the width of the limp portion of the belt, and a pair of end sections which are formed with a crown portion, the center of which is slightly greater than the diameter at each end of each end section. A flat, relatively narrow edging of relatively rigid material is fastened to both edges of the belt. Each edging ...

Apparatus for controlling a steerable antenna to track a distant radio source, according to the relative phase and amplitude of TMO1 mode signals and TE11 mode signals developed in a circular waveguide which receives the radio signals collected by the antenna. The apparatus comprises a TMO1 mode coupler and a modulator arranged to apply a cyclic modulation to signals derived from the TMO1 mode, a second coupler connected to combine the modulated signals with signals derived from the TE11 mode si...

Documents are fed into a transport system wherein the leading and trailing edges thereof are detected by an item presence detector. As the document travels through the transport system various control stations are passed at which an operation is selectively performed on the document. After passing the various control stations, a document is deposited in one of a plurality of stacker pockets. A document is tracked through the transport system by means of tracking logic responsive to the leading a...

Control signals with a predetermined level are recorded in parallel with the information signal recording tracks which are recorded upon a recording medium being in parallel with each other, spaced apart from each other by a predetermined distance and inclined at an angle relative to the direction of the transport of the recording medium. The speed of the recording medium is so controlled that the relative position of the control signals relative to the reproducing head or heads or the degree of...

A tracking mechanism for centering a sanding belt of a belt sander, wherein a linkage means is connected to the frame of the sander. The linkage means carries a mounting bracket to which an idler pulley is rotatively connected. The linkage means has a plurality of links pivotally interconnected to each other to form a frusto-polyhedron whose vertex defines a pivot point disposed forwardly of the idler pulley, so that when unbalanced forces act on one side of the idler pulley, the linkage means w...

The specification discloses an automated optical instrument system which includes a support pedestal rotatably supporting a housing on the upper end thereof. The housing includes a laser for directing a collimated beam of light for use in surveying and also includes an infrared detector system mounted therein. A portable beacon which emits infrared waves is adapted to be attached to a surveying stadia rod or to earth moving equipment or the like. The infrared detector system detects the position...

A cam follower in the form of a roller has an outer peripheral contact surface of varying width to effect variable roller edge contact on the surface of a cam with which it is in rolling engagement.

The apparatus disclosed herein is a submarine based tracking system for tracking one or more independently movable underwater objects each equipped with system synchronized apparatus for transmitting underwater a PRN (pseudo random noise) signal characteristic of that particular object. The submarine is equipped with an array of precisely located hydrophones for sensing the PRN signals, a signal processor, a computer, and a display. The computer is programmed to direct the outputs of both a pair...

There is herein disclosed a method for controlling the motion of an electron beam gun with respect to a work piece so that the electron beam will follow the path along the seam between the two parts which are to be welded. Means are provided for maintaining a fixed tangential velocity along the path. Control of the motion is achieved from signals derived as the seam is scanned by the circular motion of the electron beam in the area including the seam. These signals are in the form of pulses gene...