Abstract: Commercial aircraft are protected from attack by infrared seeking guided missiles through the utilization of a ground-based directed infrared countermeasure system in which the deployment of an IR guided missile is detected off-aircraft and more particularly on the ground. An infrared laser beam is projected towards the detected missile such that the projected laser infrared radiation impinges upon the missile from the rear. The off-axis infrared radiation illuminates the IR transmissive dome at the head of the missile where it is internally reflected back towards the IR detector carried by the missile through the total internal reflection characteristics of the dome. The domes of these missiles are typically made of a high index of refraction IR transmissive materials such that the material is prone to total internal reflection. The infrared laser generated radiation is a modulated so as to interfere with the guidance system of the missile causing it to execute a turn and plunge to the ground.

Abstract: A multi-port junction is fed with a frequency-stepped source and has one of its ports connected to an antenna that can serve either as a transmit-and-receive antenna or as a receive antenna only, with the outputs of the multi-port junction being used to estimate a complex reflection coefficient for each frequency of interest. The subject system requires no IF stages, down-conversion mixers or oscillators, and therefore may be provided adjacent each antenna at low cost. An embodiment involving co-located separate transmit and receive antennas is used to minimize the power requirements for the multi-port junction, whereas in a third embodiment, an array of transmit/receive antennas is used, fed by the same RF source but in which digitally-controlled phase shifters are used for beam-forming purposes.

Abstract: In a method for removing moisture from an optical system at high altitude, the improvement comprises using the difference in flow resistance between the desiccant path and the optical cavity path to enable airflow through the desiccant unit and not through the optical path.

Abstract: Disclosed is an assembly which comprises a printed circuit board on which there is mounted a component of an electrical connector. The printed circuit board and the electrical connector component have aligned mounting apertures. A boardlock member extends axially through these apertures and has a mounting foot engagement structure from which two resilient spaced legs depend. These spaced legs each have projections which are axially spaced from one another so that the connector member may engage a circuit board of one thickness on the projection of one leg and also engage a circuit board of another thickness by the projection on the other leg.

Abstract: A removable shroud latch for securing a printed circuit board (PCB) or second connector (device) to a first connector has a rectangular base which surrounds the first connector. The shroud latch engages the device by means of two pairs of inwardly biased arms that extend from the top of the elongated sides to engage opposite sides of either a hole in the PCB by means of knobs centered on the inward side of outwardly flared flanges at the upper ends of the arms or to an edge of the second connector. A plurality of inwardly extending shoulders on the bottom of the elongated sides engage the bottom edge of the first connector to prevent upward vertical movement of the shroud latch.

Abstract: Disclosed is an insertion and ejection printed circuit board edge connector assembly. A circuit board fits into a slot in an elongated housing, and at each end of the housing there is an ejectment mechanism having an upper engagement arm and a lateral engagement arm which is pivotally connected to the housing at a point between the engagement and ejectment arm. The engagement arm is fixed to one end of the circuit board by a flexible latch which may be disengaged to allow the ejectment arm to pivot upwardly to eject the circuit board.

Abstract: An insert for a modular jack assembly insert comprising an insulative member having top and bottom walls; a front end and a rear recess; a first wire extending from adjacent the bottom wall of the insulative member across the rear recess to the top wall and then through the front end of the insulative member; and a second wire extending from adjacent the bottom wall of the insulative member across the rear recess in non-contacting, overlapping relation with the first wire.