Abstract: An algorithm is provided for a frequency domain reflectometer which takes into account both attenuation per unit length of transmission line and phase shift per unit length of transmission line in a modified Inverse Fourier Transform that converts a frequency domain complex reflection coefficient into a more accurate time domain reflection coefficient so that the distance to a fault can be readily determined.

Abstract: A wireless phone having an internal GPS-receiver is turned on by an auxiliary switch coupled to a Microwire bus for turning on the phone and the internally carried GPS receiver so that the phone can be made to call a predetermined number and report location. If the switch closure is a result of paging, a phone can be paged to report location whether or not the phone is initially off. This accommodates such applications as Alzheimer patients, truck-tracking, kid-tracking, pet-tracking and in general any application in which a wireless communications device such as a cell phone can be caused to report location, with the phone initially in an off condition. Alternative activations through the closure of specialized switches responsive to airbag deployment, car alarm activation, medical condition alerts, and perimeter violations, provides local activation of the system.

Abstract: A robust, easily deployable, covert, passive intrusion detection system uses one or more E-field sensors to detect the presence of a moving individual and to provide an indication of the presence of the individual adjacent the sensor based on E-field distortion produced by the individual. Single-ended and differential E-field sensors with noise canceling and a guarding circuit provide sufficient sensitivity, with filtering from 0.5 Hz to 8.0 Hz selecting only human intruders. Either visible or invisible flashing light sources at the sensor indicate the presence of a moving individual at the sensor, thus to provide intruder location without the necessity of providing a geolocation system.

Abstract: A processor extracts a numeral string from a pager message which has been received via a pager antenna and a pager-signal receiving unit, and retrieves a telephone number including that numeral from a built-in telephone directory memory. The retrieved telephone number is displayed on a display unit, making it possible to determine a complete telephone number.

Abstract: A computationally efficient modeling system for imagery scales both the original image and corresponding principal component tiles in the same proportion to be able to extract scaled principal components. The system includes recovery of feature weights for the image model by extracting the weights from the reduced size principal component tiles. The use of the reduced size tiles to derive weights dramatically reduces computer overhead both in the generation of the files and in the generation of the weights, and is made possible by the fact that the weights from the scaled down tiles are nearly equal to the weights of the tiles associated with the full size image. The subject system thus reduces computation and the number of bits required to represent features by first scaling the image and then tiling the image in the same proportion. In one embodiment, the scaled down tiles are used as training exemplars used to generate the principal components.

Abstract: An RF tag is provided to communicate with an interrogating source in which the tag has programmability and flexibility to uplink data to multiple platforms. As such the RF tag functions as a miniature programmable transceiver capable of communicating with a plurality of different platforms each having different waveform characteristics. With well-controlled spectral characteristics due to stored waveforms and the use of specialized direct digital up and down conversion techniques, data rates up to 256 kbps are achievable. The tag is thus capable of converting microwave signals directly to digital inputs, and the transmitter generates microwave signals directly from digital outputs. Flexible digital processing also allows a throughput of 900 BOPS when using field programmable gate arrays.

Abstract: A latching mechanism for an expandable CD book which expands with the insertion of CD disks includes a spring-loaded strap which is anchored at one end through a stretchable elastic web to one cover of the CD book and which is anchored to the other cover of the CD book through a snap arrangement. When the CD book is filled, the top and bottom covers of the CD book are more separated, which increased distance is accommodated through the extension of one end of the strap made possible by stretchable elastic webbing. When the strap is looped around the expanded book and is attached by the snap, the increased thickness of the book is taken into account by the extension of the strap, with the strap being secured tightly in place around the expanded book by virtue of the stretchable webbing which is anchored at one end to one cover of the book.

Abstract: A system is provided for calibrating an acoustic hull integrity sensing system by providing a coupon attached to the interior surface of the hull, in which the coupon has a stepped calibration block, with one of the steps approximating the thickness of the hull to be measured at the position of the coupon. The stepped calibration block is made of a material with the same acoustic properties as that of the hull. Acoustic energy is propagated towards the hull and passes through the hull, the interface between the hull and the block and to the interface between the stepped surface and the surrounding material, with reflected acoustic energy having a time of arrival at a sensor measured through the use of zero crossing detectors, in which the thickness of the stepped block that most closely approximates that of the hull is multiplied by a ratio that is the time for energy to propagate through the hull, divided by the time for the energy to propagate through the stepped block.

Abstract: A four-port junction is substituted for a six-port junction in a frequency domain reflectometer, which reduces the parts count and therefore cost and size of the reflectometer while improving reliability. The frequency domain reflectometer can alternatively be used as an insertion loss tester. An algorithm including the Hilbert Transform is used to directly calculate the estimated reflection coefficient from the output power measured at only two output ports.

Abstract: A multi-port junction is used in combination with an Inverse Fourier Transform to detect distance to fault in an RF transmission line or waveguide without the use of heterodyne down-conversion circuits. To provide an ultra-wide bandwidth frequency domain reflectometer the output ports of the multi-port junction are used to calculate distance to fault and return loss. The Inverse Fourier Transform algorithm is modified to take into account both phase shift per unit length of the transmission line and attenuation per unit of length in the transmission line, with the output of the modified Inverse Fourier Transform being applied to a module that subtracts out the effect of previous faults by solving for the distances ahead of time before knowing amplitudes and for solving for amplitude at each prior fault starting with the first fault. The output of this module is then used thresholded to remove the effects of noise, secondary reflections and inconsequential peaks.

Abstract: A wireless phone based system to accommodate users of wireless phones for providing information as to the location of certain services such as gasoline stations, movie theatres, drug stores, etc., includes the utilization of a GPS receiver and a wireless phone, with the wireless phone adapted to call a predetermined number requesting the desired service and providing the location of the cellular phone. In one embodiment, the GPS receiver is co-located with the wireless phone in a car, with the wireless phone being carried in a handsfree cradle having a number of service-request buttons, such that depression of a service-request button activates the wireless phone through its bus structure to call a predetermined number and provide the identity of the caller along with the caller's location.

Abstract: An asymmetric slotted L-shaped antenna is provided with a wide bandwidth in an exceedingly small size with good gain across the entire bandwidth by shorting out one end of the slot and by providing a capacitor at the other end of the slot, with the result that with appropriate capacitance, spacings and dimensions, the impedance of the slotted transmission line cancels the reactance of the antenna such that the gain of the antenna can be made to match a similar sized meander line loaded antenna.

Abstract: The problem of the low efficiency of large quantum defect optical parametric oscillators is solved by recycling unused photons in a process involving pumping additional parametric processes having a common resonant wavelength. In order to improve the efficiency, a series of optical parametric oscillators are pumped with unused signal photons which exist at the output of a previous optical parametric oscillator that generates both signal and idler outputs, with the idler constituting the desired output.

Abstract: A CD case in the form of a hinged clamshell is provided with a transparent display window central to one surface of the case, with the case being provided with CD holders within the case mounted in such a way that the central portion of the CD is exposed through the transparent central window. The CD case permits the display of indicia on the CD contained therein through the window, or in an alternative embodiment a centrally apertured pocket is placed between the CD case window and the interior of the case, with the pocket being adapted to house indicia-carrying inserts for displaying the indicia through the central CD case window. In one embodiment, scratching of the window is minimized through the utilization of a piping detail around the periphery the window which spaces the exterior surface of the case from the exterior surface of the window, thus providing protection for the window.