Abstract: The closed feedback loop of an oscillator contains a network (i.e. a resot circuit or filter) which has a distinct phase-frequency characteristic so as to cause an overall in-phase condition. In the subject feedback loop, shifting the phase of the feedback wave in the filter, the frequency of the oscillator will shift due to its double heterodyning circuit to reestablish a net zero phase shift around the loop. This oscillator is particularly adapted to shift a sonar signal frequency to simulate true doppler shift where this shift is a fixed percentage of the frequency.

Abstract: A manually operative, programmed (dedicated) calculator that computes the nge, bearing, and time of closest point of approach for any number of selected target ships, and also their course and speed.

Abstract: An improved energy and shock absorber is provided using one standard off--shelf textile material for all the strap components having the same configuration and composition and varying only in length. Such a design enables the shock absorber to be fabricated and/or repaired economically and expeditiously at any installation or facility that has available a commercial sewing machine. The magnitude of shock absorption can be varied without the need for any research and development effort, and by operating personnel.

Abstract: A passive EW radar decoy capable of simulating relatively large targets s as naval ships. The decoy comprises a cylindrical, dimensionally stable plastic balloon having uniformly distributed on the surface thereof a Van Atta array of printed circuit radiators. The radiators in the array are disposed in a selectively predetermined geometric configuration such that incident energy from a remote source is reradiated by the array in the direction of the remote source. The decoy comprises a low-cost, light-weight, relatively simple structure that can be easily stored and rapidly deployed and released.

Abstract: A multi-channel optical correlation system employs a light source to illuminate a mask having a plurality of linearly disposed channels, each of which has recorded information defined by variations in opacity along its linear length. The light source is modulated as a function of an unknown input signal. A multiple element charge coupled device having its elements arrayed in linearly disposed groups along axes parallel to the linearly disposed channels of the illuminated mask is positioned to receive the light energy transmitted by the illuminated mask for developing a charge within each such element commensurate with the photo energy received at its discrete position.

Abstract: Tracking filter apparatus for determining the relative phase of synchroni CW navigation systems. The apparatus generates a square wave signal the phase and amplitude of whose fundamental sinusoidal components match those of the fundamental components of signals being tracked. The apparatus operates with a digital computer which processes sample OMEGA amplitudes to acquire and maintain synchronism with the standard OMEGA multiplex pattern.

Abstract: Coextensive first and second optical waveguides are disposed with substantially uniform periodic variations in spatial separation including repetitive sections of close proximity which will permit optical coupling therebetween. The first optical waveguide has a different optical length (i.e., different light energy propagation characteristics) than the second optical waveguide. Due to the different effective optical lengths of the two waveguides between contiguous sections of close proximity where optical coupling may take place, light energy of a determinable frequency propagated along one of the waveguides is substantially all coupled into the other optical waveguide in the course of propagating along a determinable number of the repetitive sections; light energy of all other frequencies is effectively phase cancelled and thus inhibited from being coupled between the two optical waveguides.

Abstract: An electronic control system for changing the image size produced by solid tate sensors such as the Reticon sensor array, charged coupled devices, etc. The image size is increased or decreased by varying the horizontal and vertical scanning rate with respect to standard TV timing. The scanning rate is controlled by controlling the frequency of the horizontal and vertical clock pulses applied to the solid state sensor.

Abstract: Infiltrators into protected zones are identified by depositing a tacky narrow band fluorescent material, on a perimeter portion of the zone, by illuminating infiltrators of the perimeter with a beam of ultra-violet light and by spectroscopically analyzing a telescopic-received image of the illumination. Most suitably, the fluorescent material is a europium chelate composition, such as europium trifluoracetonate dissolved in acetonitrile and added to an uncatalyzed resin.

Abstract: Digital data having a rate R and to be transmitted is converted into a K- code, T-seconds long and delayed according to a particular N-bit word, where N=RT, whereby the code carries information in its delayed position in the T frame and not in the code itself. At a receiver station, the correlation function of the received signal is produced and the envelope detected, after which the samples are taken at each of the K possible output times. The largest output selected comprises the information on the delay of the transmitted signal.