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    • 91. 发明授权
    • Antenna beam congruency system for spacecraft cellular communications
system
    • 航天器蜂窝通信系统的天线波束一致系统
    • US06014372A
    • 2000-01-11
    • US986611
    • 1997-12-08
    • Edward Jay KentCharles Edward Profera, Jr.Thaddeus Arthur Hawkes
    • Edward Jay KentCharles Edward Profera, Jr.Thaddeus Arthur Hawkes
    • H04B7/204H04B7/185
    • H04B7/2041
    • A spacecraft-based cellular communications system includes a spacecraft with transmit and receive antennas, each of which produces a plurality of spot beams which, together, provide coverage of the region served. In order to control the pointing of the spacecraft antennas, four mutually adjacent spot beams are centered over a particular "beacon" location, so that the beacon location lies between a pair of North and South spot beams, and between a pair of East and West spot beams. The transmit antenna is controlled by transmitting a beacon signal in time sequence over each of the four spot beams surrounding the beacon location, and decoding or desequencing the time-sequential signal received at the beacon location. The decoded signal is processed to provide a signal indicating the pointing error of the transmit antenna, and the error signal is used to control a gimbal which controls the pointing of the transmit antenna.The receive antenna is independently controlled by a generally similar system, in which the beacon signal is transmitted from the beacon location to the receive antenna, and the beacon signal is selectively received from the four spot beams in a time-sequential manner. The received beacon signal is processed in much the same manner as in the transmit antenna controller, and controls a gimbal associated with the receive antenna, to cause the receive antenna to point at the beacon location. Since both transmit and receive antennas point at the beacon location, their beams can be congruent.
    • 基于航天器的蜂窝通信系统包括具有发射和接收天线的航天器,每个天线产生多个点波束,它们一起提供所服务区域的覆盖。 为了控制航天器天线的指向,四个相互相邻的点波束在特定的“信标”位置为中心,使得信标位置位于一对南北波束之间以及一对东西方之间 点梁。 通过在信标位置周围的四个点波束中的每一个上按时间顺序发送信标信号来控制发射天线,以及对在信标位置处接收到的时间序列信号进行解码或排序。 处理解码信号以提供指示发射天线的指向误差的信号,并且使用误差信号来控制控制发射天线的指向的万向节。 接收天线由大体上类似的系统独立地控制,其中信标信号从信标位置发射到接收天线,并且以时间顺序的方式从四个光束中选择性地接收信标信号。 接收到的信标信号以与发射天线控制器中相同的方式被处理,并且控制与接收天线相关联的万向架,以使接收天线指向信标位置。 由于发射和接收天线都指向信标位置,它们的波束可以是一致的。
    • 94. 发明授权
    • Fingerprint matching by estimation of a maximum clique
    • 通过估计最大集团的指纹匹配
    • US5933516A
    • 1999-08-03
    • US959177
    • 1997-10-28
    • Peter Henry TuRichard Ian Hartley
    • Peter Henry TuRichard Ian Hartley
    • G06T7/00G06K9/00
    • G06K9/00093
    • A base pair of minutia is selected in the latent fingerprint under consideration and each tenprint or reference fingerprint. For each selected base pair, those sets of minutia pairs are selected which satisfy apriori constraints including angle, distance and ridge counts, to generate a first set of minutia which support the fingerprint correspondence. A second set of the supporting minutia pairs is generated from the first set, which doesn't contain pairs which are inconsistent with the base pair/bias angle. A third set is established using "dynamic programming" to determine the largest topologically self-consistent subset of the second set. The minutia pairings are counted in the third set, to thereby establish a merit of the base pair. For each of the minutia of the latent fingerprint, a correspondence group is generated, of a predetermined number of minutia of the tenprint which have the greatest merit. The group is searched for a maximal clique in which every latent-tenprint minutia pair is consistent with every other minutia pair in the clique. A cardinality, equal to the number of latent-tenprint minutia pairs in the maximal clique, is stored. The steps are repeated, to generate a set of cardinalities.
    • 在潜在指纹中选择一对基本细节,每个印记或参考指纹。 对于每个选择的基对,选择满足包括角度,距离和脊数的先验约束的这些精细对组,以生成支持指纹对应的第一组细节。 从第一组产生第二组支持细节对,其不包含与基准对/偏置角不一致的对。 使用“动态规划”建立第三组以确定第二组的最大拓扑自相一致子集。 细节配对在第三组中计数,从而建立了碱基对的优点。 对于潜在指纹的每个细节,产生具有最大优点的预定数量的印记细节的通信组。 该小组搜索最大的集团,其中每个潜在的印刷细节对与集团中的每个其他细节对一致。 存储等于最大组中潜在版图细目对数量的基数。 重复这些步骤,以生成一组基数。
    • 95. 发明授权
    • Spacecraft antenna array with directivity enhancing rings
    • 具有方向性增强环的航天器天线阵列
    • US5874924A
    • 1999-02-23
    • US972202
    • 1997-11-17
    • Rezso Janos CsongorMichael John Noyes
    • Rezso Janos CsongorMichael John Noyes
    • H01Q1/28H01Q19/10H01Q19/30H01Q21/26H01Q1/22
    • H01Q1/288H01Q19/108H01Q19/30H01Q21/26Y10S343/02
    • An array antenna (12atf) particularly useful for a spacecraft includes a plurality of antenna elements (310). Each of the elements includes a conductive hexagonal cup (408) having sides (410a, 410b, 410c, . . .) which are thirteen twentieths of a wavelength long at the center frequency, and have a height above the bottom (412) which is a little more than one-third wavelength. A crossed dipole (420) includes two dipoles (420V, 420H), the first (421, 422) having elements approximately one quarter wavelength long, and the second (420H) having elements (423, 424) about three twentieths of a wavelength long. The plane of the crossed dipole is about one quarter wavelength above the bottom of the cup. A first director ring (512) has a diameter of about one quarter wavelength, and is spaced about nine tenths of a wavelength above the bottom. A second director ring (514) has a like diameter, and is spaced about seven tenths of a wavelength above the bottom of the cup. The director rings have a thickness measured axially which is about one hundredth of a wavelength. A mounting arrangement includes a dielectric tripod (522) transfixed by a dielectric cylinder (520), on which the director rings are mounted.
    • 特别适用于航天器的阵列天线(12atf)包括多个天线元件(310)。 每个元件包括具有侧面(410a,410b,410c ...)的导电六边形杯(408),其具有在中心频率处长波长的十三分之二,并且具有高于底部(412)的高度, 略高于三分之一波长。 交叉偶极子(420)包括两个偶极子(420V,420H),第一(421,422)具有大约四分之一波长长的元件,第二(420H)具有约三分之二波长的元件(423,424) 。 交叉偶极子的平面比杯子底部大约四分之一波长。 第一引导环(512)具有大约四分之一波长的直径,并且间隔开高于底部波长的九分之一波长。 第二引导环(514)具有相似的直径,并且间隔开高于杯底部的波长的十分之七。 导向器环具有轴向测量的厚度,其大约为波长的百分之一。 安装装置包括由绝缘筒(520)固定的电介质三脚架(522),其上安装有导向器环。
    • 97. 发明授权
    • Optical system design optimization using an analytical figure of merit
    • 光学系统设计优化使用分析品质因素
    • US5786940A
    • 1998-07-28
    • US767939
    • 1996-12-17
    • Paul N. Robb
    • Paul N. Robb
    • G02B13/00G02B9/14
    • G02B13/00
    • Analytical optical system design optimization implements an optical material selection module (302), a thin lens power calculation module (304), a prescription module (306), a figure of merit determination module (308), a bending adjustment module (310), and a focal length scaling module (312). The optical material selection module (302) selects a set of optical materials that are appropriate for use together in an optical system using the dispersion coefficients of the materials. Potential optical designs are screened according to thin lens power criteria. For each design with acceptable power distribution, a lens prescription is arranged and thickness is added to each lens by the prescription module (306) to provide a thick lens assembly. Designs can then be analyzed according to a figure of merit that evidences optical system performance by the figure of merit determination module (308). In an exemplary embodiment the polychromatic RMS spot radius for each design is analyzed. The thick lens assembly is then adjusted by the bending adjustment module (310). The assembly is adjusted over bending range to identify the degree of bending at which the design is optimized according to the figure of merit. After optimization according to bending and the figure of merit, the focal length of the lens is calculated and the design is scaled by the focal length scaling module (312) so that various designs can be appropriately compared.
    • 分析光学系统设计优化实现光学材料选择模块(302),薄透镜功率计算模块(304),处方模块(306),品质确定模块(308),弯曲调节模块(310) 和焦距缩放模块(312)。 光学材料选择模块(302)使用材料的色散系数在光学系统中选择适合一起使用的一组光学材料。 根据薄透镜功率标准对潜在的光学设计进行筛选。 对于具有可接受的功率分布的每个设计,布置透镜处方,并且通过处方模块(306)向每个透镜添加厚度以提供厚透镜组件。 然后可以根据通过品质因数确定模块(308)证明光学系统性能的品质因素来分析设计。 在示例性实施例中,分析每个设计的多色RMS RMS光点半径。 然后通过弯曲调节模块(310)调整厚透镜组件。 在弯曲范围内调整组件以根据品质因数识别设计优化的弯曲程度。 在根据弯曲和品质优化进行优化之后,计算透镜的焦距并通过焦距缩放模块(312)缩放设计,使得可以适当地比较各种设计。
    • 98. 发明授权
    • Planar, hermetic metal matrix housing
    • 平面,密封金属基体外壳
    • US5770816A
    • 1998-06-23
    • US815349
    • 1997-03-11
    • Michael Kevin McNultyBradley David Dufour
    • Michael Kevin McNultyBradley David Dufour
    • H01L23/10H01L25/065H05K5/06
    • H01L23/10H01L25/0655H01L2924/0002H01L2924/3011
    • A hermetically sealed housing for plural GaAs chips includes a body made from Al/SiC. The body defines a peripheral seal ring support surface, an electrical connector insert support surface and an end wall to which a ceramic insert is mounted. The insert includes a first portion with an upper surface within the sealed housing, Which upper surface is coplanar with the upper surface of the body, for convenient HDI film connections to the chips and electrical connector inserts. The refractory electrical conductors extend from the upper surface of the first portion of the insert to an exterior terminal portion of the insert. The terminal portion of the insert is spaced from the first portion of the insert by a non-terminal portion containing no terminals. The non-terminal portion of the insert is coplanar with the seal ring support surface of the body, and contiguous therewith. The insert, a titanium seal ring, and the body are hermetically joined by aluminum, which fills the pores of the body and the interstices between the body, the insert, and the seal ring. A domed lid is sealed to the seal ring.
    • 用于多个GaAs芯片的气密密封壳体包括由Al / SiC制成的主体。 主体限定外围密封环支撑表面,电连接器插入件支撑表面和安装陶瓷插入件的端壁。 插入件包括具有在密封壳体内的上表面的第一部分,其上表面与主体的上表面共面,以便于HDI膜连接到芯片和电连接器插入件。 难熔电导体从插入件的第一部分的上表面延伸到插入件的外部端子部分。 插入件的端子部分通过不包含端子的非端子部分与插入件的第一部分间隔开。 插入件的非末端部分与主体的密封环支撑表面共面且与其相邻。 插入件,钛密封环和主体由铝气密地连接,铝填充主体的孔隙以及主体,插入件和密封环之间的间隙。 圆顶盖密封到密封圈。
    • 99. 发明授权
    • Extended wavelength digital alloy NBN detector
    • 扩展波长数字合金NBN检测器
    • US08674406B2
    • 2014-03-18
    • US12837444
    • 2010-07-15
    • Jeffrey W. ScottGeorge Paloczi
    • Jeffrey W. ScottGeorge Paloczi
    • H01L31/00
    • H01L31/035236B82Y20/00H01L27/142H01L27/14649H01L31/0232H01L31/0304H01L31/03046H01L31/1035H01L31/184H01L31/1844H01L33/14H01L33/30Y02E10/544
    • A strain-balanced photodetector is provided for detecting infrared light at an extended cutoff wavelength in the range of 4.5 μm or more. An InAsSb absorber layer has an Sb content is grown in a lattice-mismatched condition to a GaSb substrate, and a plurality of GaAs strain-compensating layers are interspersed within the absorber layer to balance the strain of the absorber layer due to the lattice mismatch. The strain-compensation layers allow the absorber to achieve a thickness exhibiting sufficient absorption efficiency while extending the cutoff wavelength beyond that possible in a lattice-matched state. Additionally, the strain-compensation layers are sufficiently thin to be substantially quantum-mechanically transparent such that they do not substantially affect the transmission efficiency of the absorber. The photodetector is preferably formed as a majority carrier filter photodetector exhibiting minimal dark current, and may be provided individually or in a focal plane array.
    • 提供一种应变平衡光电检测器,用于检测在4.5μm或更大的范围内的延长的截止波长的红外光。 具有Sb含量的InAsSb吸收层在GaSb衬底中以格子失配的条件生长,并且多个GaAs应变补偿层散布在吸收层内,以平衡由于晶格失配引起的吸收层的应变。 应变补偿层允许吸收体实现具有足够吸收效率的厚度,同时将截止波长延伸超过晶格匹配状态可能的截止波长。 此外,应变补偿层足够薄以使其基本上是量子力学上透明的,使得它们基本上不影响吸收体的传输效率。 优选地,光电检测器形成为显示最小暗电流的多数载波滤波器光电检测器,并且可以单独地或在焦平面阵列中提供。