摘要:
A fiber amplifier includes at least one longitudinally extending non-doped inner core capable of transmitting signals. At least partially surrounding the inner core and extending at least partially therealong, the fiber amplifier also includes at least one gain region capable of amplifying signals propagating therethrough. The fiber amplifier also includes an outer core surrounding the gain region and the inner core and extending longitudinally therealong. The outer core is capable of transmitting pump energy such that the pump energy at least partially amplifies signals propagating through the inner core according to a nonlinear amplification process, such as a Raman or a Brillouin amplification process.
摘要:
Data from GPS satellites within the field of view of a ground station are retransmitted to LEO satellites, such as Iridium satellites, and cross-linked if necessary before being transmitted to a user. The user is then able to combine the fed-forward data with data received directly from GPS satellites in order to resolve errors due to interference or jamming. Iridium and data aiding thus provides a means for extending GPS performance under a variety of data-impaired conditions because it can provide certain aiding information over its data link in real time.
摘要:
Operation of a planar resonator gyroscope with in-plane parasitic modes of vibration to obtain improved performance is disclosed. A planar resonator gyroscope, such as a disc resonator gyroscope, may be operated with embedded electrodes. The embedded electrodes may be disposed adjacent to the planar resonator and proximate to one or more anti-nodes of a parasitic vibration mode. A sensed amplitude of the parasitic mode is applied in differential signals used to operate the gyroscope. A feedback controller for damping the parasitic mode applies a drive voltage generated from the proportional voltage to one or more drive electrodes adjacent to the planar resonator disposed proximate to one or more anti-nodes of the parasitic vibration mode of the planar resonator. Parasitic in-plane modes may be thus damped in operating the gyroscope with active damping applied through an analog operational amplifier or digital feedback.
摘要:
Operation of a planar resonator gyroscope with in-plane parasitic modes of vibration to obtain improved performance is disclosed. A planar resonator gyroscope, such as a disc resonator gyroscope, may be operated with embedded electrodes. The embedded electrodes may be disposed adjacent to the planar resonator and proximate to one or more anti-nodes of a parasitic vibration mode. A sensed amplitude of the parasitic mode is applied in differential signals used to operate the gyroscope. A feedback controller for damping the parasitic mode applies a drive voltage generated from the proportional voltage to one or more drive electrodes adjacent to the planar resonator disposed proximate to one or more anti-nodes of the parasitic vibration mode of the planar resonator. Parasitic in-plane modes may be thus damped in operating the gyroscope with active damping applied through an analog operational amplifier or digital feedback.
摘要:
A generalized high performance navigation system is provided using low earth orbit (LEO) satellites. In one embodiment, a method of performing navigation includes receiving a LEO signal from a LEO satellite. The method also includes decoding a navigation signal from the LEO signal. The method further includes receiving first and second ranging signals from first and second ranging sources, respectively. In addition, the method includes determining calibration information associated with the first and second ranging sources. The method also includes calculating a position using the navigation signal, the first and second ranging signals, and the calibration information.
摘要:
A transformable airplane may be reconfigured easily and rapidly to perform any one or a combination of tanking, transport, bombing, or command and control missions as desired for a tactical situation by installing or replacing mission-specific modules as desired. A reconfigurable aircraft includes a pair of wings and an aircraft body having at least one bay defined in an interior of the aircraft body. The at least one bay is configured to accept a plurality of removably replaceable modules that configure the aircraft to perform a plurality of missions. Transport mission modules may include space and tie-downs for cargo pallets and/or palletized seating. A roll-on/roll-off ramp may be provided. Tanking mission modules may include a remote aerial refueling operator station. Bombing mission modules may include a bomb rack and a bomb ejector. ISR mission modules may include command and control stations in signal communication with phased array antennas.
摘要:
A system and method for detecting physiological stress in a person is provided which includes an imagining device and a processor. The processor receives an output from the imagining device representative of the. The processor identifies a characteristic of the person in the image which indicates that the person is not experiencing stress and a second characteristic which indicates the person is experiencing stress. A comparator compares the image of the subject and the two characteristics and the processor extrapolates from the comparison whether or not the person is experiencing a heightened state of stress or nervousness. If so the processor provides an output to activate an alarm or otherwise signal this condition to other individuals involved in monitoring a given area.
摘要:
An automated lenticular photographic system includes an interface that permits a user to upload image files and image processing and printing equipment that is in communication with the interface for receiving the uploaded image files and processing the uploaded image files to create an interlaced print image file that is used to produce an interlaced print sheet containing interlaced print images. A pair of registration marks is formed on the interlaced print sheet outside of borders of the interlaced print images. The system also includes a processing station where the interlaced print sheet is aligned with a lenticular lens sheet with a registration system that detects whether the lenticular lens sheet is off-centered and skewed relative to the interlaced print sheet. The system also includes means for controllably adjusting the position of the lenticular lens sheet relative to the interlaced print sheet until proper registration between the lenticular lens sheet and the interlaced print sheet is achieved. The lenticular lens sheet is at least selectively joined to the interlaced print sheet to provide a lenticular product that can be delivered back to the user.
摘要:
Data from GPS satellites within the field of view of a ground station are retransmitted to LEO satellites, such as Iridium satellites, and cross-linked if necessary before being transmitted to a user. The user is then able to combine the fed-forward data with data received directly from GPS satellites in order to resolve errors due to interference or jamming. Iridium and data aiding thus provides a means for extending GPS performance under a variety of data-impaired conditions because it can provide certain aiding information over its data link in real time.
摘要:
This invention describes a means for acquiring GPS P/Y code under jamming conditions. It improves jam resistance by augmenting a component of the GPS signal with one from a different satellite system, such as a low earth orbiting (LEO) satellite. The preferred embodiment of this invention employs the Iridium LEO satellite constellation broadcasting in a 10 MHz wide band about 1,621 MHz. A low-cost, integrated Iridium receiver coupled to the GPS receiver employs a single antenna that is capable of receiving both the GPS and Iridium signals together.
摘要翻译:本发明描述了一种用于在干扰条件下获取GPS P / Y码的装置。 通过使用来自不同卫星系统(例如低地球轨道(LEO))卫星的GPS信号的分量来增加GPS信号的分量来改善阻塞阻力。 本发明的优选实施例使用大约1,621MHz的10MHz宽带中的铱星LEO卫星星座广播。 耦合到GPS接收器的低成本,集成的铱星接收机采用能够一起接收GPS和铱星信号的单个天线。