A compact flight data acquisition and recording system is disclosed in which a recorder unit is detachable from the remainder of the system. The recorder unit comprises a casing in which is mounted a tape deck and drive means for the tape deck is mounted externally of the recorder unit and is disconnectible from the tape deck when the recorder is detached from the system.

A sync acquisition system for synchronizing a controlled element, such as a motor or a voltage-controlled oscillator, with a reference frequency wherein the feedback frequency derived from the controlled element is compared with the reference frequency for providing outputs for accelerating or braking the controlled element in response to the comparison and also providing an output indicative of the phase difference between the reference and feedback frequencies so that when the controlled eleme...

This invention is a camera for use in making true color photographs which is especially useful in aerial and space photography applications. In accordance with the invention, the camera provides a gray scale reference image for each scene photographed. This reference image is exposed on an edge of the film by means of a light characteristic reference image negative disposed in close proximity to the film surface and fiber optic light transmission means which transmits light energy to the negativ...

A method and apparatus are disclosed for monitoring a plurality of signal sources to detect the time of occurrence of a change in signal condition from any of the signal sources, the sign of the change and the signal source generating the change. The monitoring is performed by source-associated receivers which generate an "event flag" upon occurrence of a change in signal condition. The outputs of each receiver are combined in intermediate level selectors for use by a master level selector to en...

A closed loop scanning and positioning system for finding and positioning white blood cells includes a multifaceted rotating mirror, an optical system, two photoelectric sensors, two light sources and a logic circuit. The logic circuit produces signals which are used to drive a microscope stage in x and y directions to cause the blood cell to be positioned within a small aperture.

A data acquisition device for recording information supplied by an operator in response to a plurality of questions visually presented to the operator in a predetermined sequence has a slide projector and mirror system for visually displaying a sequence of slides on a screen readily observable by the operator. Each slide bears an image frame having a question, multiple-choice answers, and an identification code photographically recorded thereon. The operator selects and actuates a switch corresp...

A target tracking and acquisition system includes a Cassegrain reflector system driven by three horn feed elements. One horn excites a main lobe coincident with the reflector system boresight axis while the other horns excite main lobes at off axis angles above and below the boresight axis. Relatively high amplitude crossovers exist between the three main lobes. The feed producing the main lobe coincident with the boresight axis lies at a focal point of the reflector system, while the feeds whic...

A system is disclosed for accessing selectively data at a plurality of points and applying data from a selected point to a suitable utilization device such as a computer or a computer-like device. In particular, the subject system maximizes the number of points from which data can be gathered by priming the various system components for a subsequent step of acquiring data from a second point while the system is still processing the data from the first point. This system incorporates an integrati...

A digital target acquisition system for assisting the operators of manually ontrolled theodolites acquiring fast maneuvering targets. The system compares the pointing angles of a theodolite to acquisition orders transmitted by a remote range-control central and supplies the theodolite operator with visual error indications that will enable him to train his camera on the designated target. The system is capable of simultaneously assisting the operators of up to four theodolites in acquiring four ...

An automatic carrier acquisition system for a phase-locked loop (PLL) receiver is disclosed. It includes a local oscillator, which sweeps the receiver to tune across the carrier frequency uncertainty range until the carrier crosses the receiver IF reference. Such crossing is detected by an automatic acquisition detector. It receives the IF signal from the receiver as well as the IF reference. It includes a pair of multipliers which multiply the IF signal with the IF reference in phase and in qua...