Abstract:
A direction finding system is used in which a number of adjacent bands are sequentially measured in fast rotation, with the results from each of the bands being FFT processed to provide amplitude and phase information on all of the signals existing within the band. Upon ascertaining that one wishes to do a direction finding process, one merely accesses the information in the delay memory so that direction finding resources are only allocated to signals of interest and such that one does not have to redo an EFT upon finding a signal of interest.
Abstract:
An active armor system which includes an outer (11) and an inner (30) armor layer with a medial space (28) between the inner (30) and outer (11) armor layers layer. If the outer armor layer (11) is struck by a shaped-charge projectile (15), one or more small shaped-charges (50, 58) positioned in the medial space (28) is detonated. The small shaped charges (50, 58) in the medial space (28) are detonated by an electrical current produced when a piezoelectric, electrostrictive, or magnetostrictive material (16) is struck by the shaped-charge projectile (15).
Abstract:
An apparatus and method for detecting gases, gasified agents or other analytes. The apparatus includes a solid body (12) having a first surface area and a second surface area. Two coating (14, 16) comprising different materials, which absorb different agents at different rates are superimposed on the first and second surface areas of the solid body. A wave propagating transducer (30) is positioned adjacent the solid body (12) to propagate a first wavefront and a second surface wavefront adjacent the first and second surface areas of the solid body. The first and second wavefronts interfere to produce an interference pattern which is unique to the particular agent which is adsorbed by the first and second coatings. A transducer array (32) records this interference pattern to identify the agent based on the nature of this interference pattern which will be uniquely characteristic of the agent.
Abstract:
A continuous tunable laser system includes at least one DBR laser. The DBR laser includes a Phase section, a Braggs section, and a gain medium. The DBR laser is capable of generating a continuous-wave laser signal. A Phase current input is electrically connected to the Phase section. A Bragg current input is electrically connected to the Bragg section and synchronized with the Phase current input. A gain control input is electrically connected to the gain medium.
Abstract:
A method for designing a cell-based ASIC device with multiple power supply voltages is disclosed. An ASIC chip image is made without applying power or ground buses to metal layer M1. All fast or high-power circuits are grouped together into high-power logic blocks and synthesized with high-power circuit macro libraries. All slow or low-power circuits are grouped together into low-power logic blocks and synthesized with low power circuit macro libraries. The associate power and ground buses are applied to metal layer M1 in each of the logic blocks. The logic blocks are placed on the ASIC so that different voltage groups are separated by at least one cell. The ASIC is then routed and tested before the mask is released.
Abstract:
A recording capability for modules (60) utilized by first responders and other personal within the area of an incident, with the stored information at each of the first responders' modules (60) being read out through an ad hoc network (62), where it can be uploaded to storage. The stored information can be displayed at an incident commander work station (321) in real time to give the incident commander a realistic view of the timeline and the severity of the incident, as well as the response. The ad hoc network (62) permits offloading stored information from each of the first responders' modules (60) so as to free up storage within the modules (60). By providing storage at every node of the ad hoc network (62), one has access to a timeline of the action at the incident as well as redundancy, which enhances the memories and observational skills of the first responders.
Abstract:
A method and apparatus is provided for correcting the phase difference estimate derived from a two-tone CW radar to correct velocity-induced range estimate phase errors by offsetting the phase difference estimate with a phase correction equal to either of the Doppler frequencies associated with returns from an object multiplied by the time interval between the samplings of the returned waveforms. The correction effectively eliminates the velocity-induced slippage between the phases of the retuned waveforms so that a comparison between the phases of the waveforms can be made to reduce or substantially eliminate range estimate bias.
Abstract:
The present invention relates to a device and method that digitally replicates the analog processing that is normally associated with an instantaneous frequency measurement device. Specifically, the present relates to a digital frequency measurement device comprising: a filter, where the filter receives an input RF signal and transmits an output signal centered around a desired frequency; a limiting amplifier downstream of the filter, where the amplifier receives and amplifies the output signal; a deserializer downstream of the amplifier that continuously samples the output signal from the limiting amplifier; and a digital frequency measurement processor (DFM), where the DIM receives data at a rate of 1/16 of the deserializer sample rate. The DIM transforms the data into multiples stages that are combined in order to produce an estimate of the input signal, where the DIM is implemented through a digital processing device.
Abstract:
For those optical waveguides that require the deposition of a thick film and a high-temperature anneal to create an appropriate waveguide medium, wafer warping, bowing or dishing is reduced or eliminated by depositing a film of the same thickness on the backside of the wafer so as to relieve film stress during the deposition and annealing process. In one embodiment the waveguide medium is silicon oxynitride, although other depositable thick films may be utilized in place of the silicon oxynitride.
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.