A stabilized optical tracking device is disclosed as capable of assisting airborne observer in tracking a ground target through highly accurate optical sighting means. A unique feature of the inventive device is the integration into a single optical system of a variety of modular subsystems whereby extreme flexibility in usage is provided. The invention described herein may be manufactured, used and licensed by or for the Government for governmental purposes without the payment to us of any roya...

A tracking system including a staggered array of radiation detectors for use with a telescope wherein the configuration of the array, the geometry of sweep of the array, and the electronics connected to the elements of the array are combined to produce control signals adapted to be used to point the optical axis of the telescope at the geometrical centroid of all signals, above a predetermined amplitude, within the field of view of the apparatus.

The specification and drawings disclose an improved mounting and operating mechanism for a plug-type door. The disclosed assembly is for use in a door opening defined by a frame including spaced first and second vertically extended frame members. Upper guideway means extend adjacent the top door opening and a lower guideway means extends under the door opening and longitudinally of the car past the second frame members. This permits a door to be moved longitudinally of the car away from the open...

A radar array is aimed to receive a signal directly reflected from a target s well as an image signal reflected from the target and from the adjoining ground surface or sea surface. An ambiguity introduced in the direct signal by the image signal, is resolved by a system which includes independent steering means and beam forming networks to form sum and difference signals from the image and the direct signals. These signals are mixed by computer controlled mixing networks to provide modified sum...

Apparatus for tracking a lamp in the nose of an aircraft calibrating an instrument landing system comprising a vidicon tube, a scanning arrangement for causing scanning the vidicon photocathode along parallel lines and including a frame scan generator controlled by a binary counter so that the instantaneous condition of the counter determines the line being scanned, a sighting device aligned with the vidicon so that a reference line of the scan can be aligned in a predetermined orientation relat...

This invention consists of an optical tracking apparatus comprising a source of parallel light, such as laser, which irradiates the object to be tracked. A light scanning device, which is disposed between the source of parallel light and the object, is provided to deflect or scan the light from the source across the object to be tracked. A convex lens is provided to focus light reflected from the object. A light detector is provided which receives the reflected light and converts it into an elec...

2. A method of tracking a target in the presence of enemy jamming which eoys a radar tracker and comprises the steps of Deriving from a radar receiver traverse and elevation components of an angular velocity signal representative of said target angular velocity with respect to said tracker immediately prior to enemy jamming of said tracker, Applying said traverse and elevational components to a coordinate conversion means for converting said components into stabilized horizontal and vertical com...

There is disclosed herein a conical scan tracking system to track an energy source wherein the speed of nutation is controlled in a pseudorandom manner rather than in a constant manner as in the prior art to eliminate false antenna pointing errors caused by incidental or deliberate amplitude modulation at the constant nutation or scan frequency of the energy received from the source being tracked.

The specification discloses an automatic elevation surveying system which includes a pivotal housing mounted on a support pedestal. The support pedestal includes a vertically disposed member attached thereto and supporting a laser beam source for projecting a laser beam in a vertical direction parallel to the axis of the member. A pentaprism is mounted within the pivotal housing, with the input face of the pentaprism normal to the laser beam, whereby rotation of the pentaprism generates a laser ...

A system for locating lightning strikes by developing the coordinates of a pair of lines, each of which is produced at a reference sensing station. At each station there are a pair of directional antennas which produce analog signals responsive to a lightning stroke. These analog signals are fed to a pair of integrators which integrate the signals for a predetermined period of time so as to produce the X and Y co-ordinate of a particular line. The analog signals are also fed through a square roo...