Abstract: An apparatus for monitoring the position of multiple objects in a space including a target supervisor, a location supervisor, and a hazard monitoring supervisor. The tracking supervisor receives target data from a sensor, characterizes and tracks selected objects, and provides a target output having multiple features respective of the selected objects. The location supervisor characterizes and displays multiple features in the space, and provides a location output having the aforementioned features therein. The hazard monitoring supervisor detects and responds to a predetermined hazard condition, and provides a detectable notice of such hazard condition, responsive to the target output and the location output. A data logger for selectively retains the target output, the location output, or both. The position monitoring apparatus has six modes: full operation, non-airport-surveillance-radar, isolation, set-up, adaptation, and simulation.

Abstract: A quadrifilar helical antenna including four conductive helices having a common central axis, a common direction of turn about said axis, a common pitch, and a common length between opposite ends, the helices being uniformly spaced from each other by 90.degree., and a single dielectric helix concentric with the common axis, lying within and supporting the conductive helices at a nominal diameter. The dielectric helix has opposite ends, a plurality of turns having said common direction of turn, and a second pitch substantially greater than said common pitch. A casing contains the helices and is rotatably fixed to one end of the dielectric helix. A tuning device is fixed to the other end of the dielectric helix and rotatable relative to said casing, so that rotation of the tuning device twists the dielectric helix to alter the common pitch of the conductive helices without substantial variation from said nominal diameter.

Abstract: A process for fabricating a front surface resonant mesh array detector produces a detector of reduced size. The reduced size results in enhanced responsivity, and minimizes thermal stress between the detector and typical array substrates, enabling fabrication of arrays using front surface resonant mesh array detectors.

Abstract: A transponder receives a stable reference frequency transmitted from an interrogator and compares the stable reference frequency to a local oscillator frequency that has short term stability. A comparison signal is provided to a synchronous oscillator for providing a locked signal that briefly locks onto the comparison signal and "remembers" its phase and frequency characteristics. The locked signal, which is inherently locked to the stable reference signal of the interrogator, is then combined with the short-term stable local oscillator frequency, and the combined signal is used in the up-converted reply back to the interrogator.

Abstract: A multi-color TFEL display includes a low ohm metal assist structure in electrical contact with the transparent electrodes to improve display brightness, and a light absorbing dark layer to increase display contrast.

Abstract: A system for automatically forming a receive beam being positioned in the direction of a corresponding incoming signal, the system having a known signal corresponding to the incoming signal. The system comprises a plurality, M, of channels, each of the channels collecting the incoming signal and generating a plurality, L, of incoming complex data samples for the incoming signal and a plurality, L, of known complex data samples for the known signal. The system also includes severaly digital beamforming means for forming the receive beam.

Abstract: A process for removing paint by high pressure waterjet blasting of painted surfaces wherein the waterjet comprises a ferrofluid or other liquid containing tiny magnetic particles suspended therein. The particles may be in colloidal suspension or be suspended by agitation and are preferably polymer coated. The liquid-magnetic particle mixture lends itself to electromagnetic process control, run-off maintenance and waste processing capabilities. Thereby, the process can employ process control and waste remediation options.

Abstract: An apparatus including a first light modulator for modulating a first light beam with a signal, a second light modulator for modulating a second light beam with a reference signal, first lens means, positioned in an optical path of the second light beam, for introducing into the second light beam horizontal magnification/demagnification which gradually varies with respect to a vertical direction, a beam combiner for combining the first and second light beams, and photodetecting means for detecting the combined light beam received from the beam combiner. The apparatus, thus constructed, is capable of processing the 50 to 100 billion operations per second required for true Doppler (time compression/expansion) processing of SONAR signals.

Abstract: In an improved system and method for simulating targets in which a target is moved across a background, background information and target information are stored in separate memories. Selected target information is supplied to selected background to create the simulation. The target memory contains two buffers which enables one frame of target information to be updated as a preceding frame is transmitted.

Abstract: A system for transmitting and receiving outbound and inbound data signals through a satellite communications network, the system having a network data rate and including a satellite and an end user transceiver, the system comprising a half-duplex mobile transceiver for transmitting and receiving the inbound and outbound data signals, respectively, for spreading the inbound data signal from the network data rate to a reduced data rate having an increased signal-to-noise ratio using a spread sequence, and for despreading the outbound data signal from the reduced data rate to the network data rate.

Abstract: In a mail sorting system, a transport/stacker module comprises a plurality of mailpiece carriers included in a conveyor moving in an endless serpentine path through a plurality of distributed sorting sites. Each carrier is provided with a door at each of the longitudinally carrier ends, which are opened to permit the raking of mailpieces from laterally arranged compartments of the carrier into underlying bins at the sorting sites by selectively actuating separate rakes of a rake mechanism stationed at each sorting site. The carrier doors are constructed to provide longitudinal extensions of the carrier floor, thereby minimizing the spacing between the carriers in the conveyor while preserving a requisite interior longitudinal dimension of the carrier when the doors are closed.

Abstract: A microelectrostatic cantilever switch that has a thin impermeable oxide layer on the surface of a contact pad which is engaged by an unsupported portion of a cantilever beam when the switch is in a closed position. The switch in the open position exhibits a capacitance between the cantilever beam and contact pad of 0.8 Pf and a capacitance of 0.001 to 0.01 Pf in the closed position.