2. A pulse-echo distance determining system comprising means for transmitting a succession of pulses at a recurring frequency, means for receiving said pulses after reflection from a distant object, said receiving means consisting of a single channel that includes a gating circuit, means for producing gating pulses that recur at the same repetition rate as the received pulses but which have alternate pulses starting late in the gating pulse repetition cycle whereby there are produced early gatin...

Electrical apparatus enabling control of sunlight collection or transmission which functions in response to sun position. The apparatus consists of quadrant sensitive sun sensors which function in coaction to produce definitive output pulses for input to logic circuitry. Outputs from the logic circuitry are applied through driver circuitry and shading control mechanism to track the sun's travel either clockwise or counterclockwise throughout daylight periods.

A laser tracking system comprises a fixed convex paraboloidal mirror and a rotatable concave ellipsoidal mirror, a first focus of which is coincident with that of the paraboloid. The axis of the ellipsoid is angularly displaced from that of the paraboloid. A small diameter laser beam parallel to the axis of the paraboloid is incident thereon. The strongly diverging conical beam reflected from the paraboloid is incident upon the ellipsoid. An enlarged diameter slightly converging beam is reflecte...

Apparatus for teaching the blind to read by scanning print with an optical probe providing a unique support for a printed page and a tracking aid for guiding the probe. The support includes generally vertically orienting end walls biased to clamp a transparent plate between their upper extremities. One end wall is provided with means to fix a printed page over the transparent plate and to establish the page in a proper plane of reference for scanning by the optical probe. A mirror-like surface b...

5. A device for detecting, at a target, the lobing modulation of tracking lses arriving at said target from a conical scan radar with time lag on the order of a fraction of the width of the tracking pulses which comprises, at said target, receiving means for intercepting, amplifying and detecting said tracking pulses, a condenser, low-impedance gate means connecting said receiving means and said condenser, normally operable for blocking any transfer of energy in both directions between said rece...

1. A digital tracking range unit for use with a correlated signal compris: g Stable frequency pulse generating means; Variable frequency pulse generator means having variable frequency output pulses lower in frequency than said stable frequency pulse generator; An inhibit gate having an inhibit input, a signal input and an output; Digital range counting means having an add input and a subtract input; Signal generating means for generating a signal of a predetermined pattern, said signal generati...

1. In an electronic tracking device sensitive to radiation of scanned targets the combination of: Focusing means having an optical axis for forming an optical image of a target, Means for converting said optical image to an electronic image at a focal point, Means for nutating said electronic image in a focal plane about said optical axis, Detector means comprising a plurality of separated detector surfaces, Means responsive to said nutated electronic image for forming a target image on said det...

A system for tracking with high precision the movement of an underwater oct having a sound detecting capability employs three bottom-moored acoustic signal sources which are generally disposed in a triangular pattern and continuously radiate acoustic signals which are clustered, for example, about 12 kc. The composite signal that is detected is processed so that each radiated signal is subsequently transformed into a pair of quadraturely phased signals which are proportional to the sine and cosi...

A tracking device is illustrated wherein a rotatable guide is moved in a path approximating the path of the trumpet or other coiler sliver guide means responsive to suitable gearing and wherein the rotatable guide has a scalloped surface over which the sliver is fed for minimizing contact between the sliver and the rotatable guide and producing positive rotation of the rotatable guide by the sliver, avoiding sliding friction therebetween.

Apparatus for tracking an object within a plane area in space comprises means for scanning the area in non-parallel directions with flat beams of optical radiation and detecting radiation reflected from any object in the plane. A single flat beam is produced by causing a near-parallel beam of radiation from a laser to diverge in one plane only towards a rotatable multifaceted drum. Parts of each facet are reflective of the radiation and rotation of the drum causes the beam to scan the plane area...