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    • 6. 发明授权
    • Method for measuring precision of star sensor and system using the same
    • 用于测量星形传感器和使用其的系统的精度的方法
    • US08433515B2
    • 2013-04-30
    • US13386979
    • 2011-08-03
    • Zheng YouFei XingTing Sun
    • Zheng YouFei XingTing Sun
    • G01C21/02
    • G01C21/24
    • A method for measuring a precision of a star sensor and a system using the same may be provided. The method may comprise steps of: 1) fixing the star sensor on the Earth; 2) inputting a current time (T) of a measuring start time relative to a J2000.0 time; 3) determining a directional vector of the navigation star in a J2000.0 Cartesian coordinate system at the current time (T) according to a right ascension and a declination of the navigation star in the J2000.0 Cartesian coordinate system and visual movement parameters (α′, δ′) of the navigation star in the direction of the right ascension and the declination which are stored in the star sensor; 4) converting the directional vector of the navigation star in the J2000.0 Cartesian coordinate system into a directional vector of the navigation star in an ecliptic coordinate system; 5) converting the directional vector of the navigation star in the ecliptic coordinate system into a directional vector (vCRFT) of the navigation star in a celestial coordinate system; and 6) converting the directional vector (vCRFT) of the navigation star in the celestial coordinate system into a directional vector (vTRF) of the navigation star in a terrestrial coordinate system, and obtaining the precision of the star sensor based on the directional vector (vTRF) of the navigation star in the terrestrial coordinate system.
    • 可以提供用于测量星形传感器的精度的方法和使用其的系统。 该方法可以包括以下步骤:1)将星形传感器固定在地球上; 2)输入测量开始时间相对于J2000.0时间的当前时间(T); 3)根据J2000.0笛卡尔坐标系中的导航星的右上升和下降确定当前时间(T)的J2000.0笛卡尔坐标系中的导航星的方向矢量和视觉运动参数( α',delta')和存储在星形传感器中的向右上升方向的偏角; 4)将J2000.0笛卡尔坐标系中导航星的方向矢量转换为黄道坐标系中导航星的方向矢量; 5)将黄道坐标系中的导航星的方向矢量转换成天体坐标系中导航星的方向矢量(vCRFT); 以及6)将天体坐标系中的导航星的方向矢量(vCRFT)转换为地面坐标系中的导航星的方向矢量(vTRF),并且基于方向矢量获得星传感器的精度 地面坐标系中的导航星的vTRF)。
    • 7. 发明授权
    • System and method for adaptively accommodating a high amplitude downstream signal in a DSL modem
    • 用于在DSL调制解调器中自适应地适应高幅度下行信号的系统和方法
    • US06898236B1
    • 2005-05-24
    • US09670490
    • 2000-09-26
    • Ting Sun
    • Ting Sun
    • H04B3/54H04L27/00H04L27/26H04B1/38
    • H04B3/542H04B2203/5408H04L27/0002H04L27/2647
    • A system and method are disclosed for adaptively accommodating a high amplitude downstream signal in a DSL modem. High amplitude downstream signals are common with local loop lengths of less than about 6,000 feet and can saturate DSL modem components and impair DSL service if not effectively accommodated.In general, a DSL system detects a high amplitude downstream DSL signal and adjusts a DSL modem analog front end in response to the detected high amplitude downstream DSL signal so that analog front end components of a DSL modem are not saturated by the high amplitude downstream DSL signal. Pursuant to one embodiment, a digital signal processor detects the high amplitude DSL signal and, in response, decreases a gain of a first stage receiver to accommodate the high amplitude downstream DSL signal. Another embodiment introduces additional attenuation of the downstream DSL signal to attenuate high amplitude downstream DSL signals before they enter first stage receiver amplifier circuits.
    • 公开了用于在DSL调制解调器中自适应地适应高幅度下行信号的系统和方法。 高幅度下行信号与本地环路长度小于约6,000英尺是共同的,并且如果没有有效地容纳,可能使DSL调制解调器组件饱和并损害DSL服务。 通常,DSL系统检测高幅度下行DSL信号,并响应于检测到的高幅度下行DSL信号调整DSL调制解调器模拟前端,使得DSL调制解调器的模拟前端组件不被高幅度下行DSL饱和 信号。 根据一个实施例,数字信号处理器检测高幅度DSL信号,并且作为响应,降低第一级接收机的增益以适应高幅度下行DSL信号。 另一个实施例引入了下游DSL信号的附加衰减,以在它们进入第一级接收机放大器电路之前衰减高幅度下行DSL信号。
    • 8. 发明授权
    • Odd-order low-pass pots device microfilter
    • 奇数级低通锅装置微型过滤器
    • US06285754B1
    • 2001-09-04
    • US09544731
    • 2000-04-06
    • Ting SunBrian L. Hinman
    • Ting SunBrian L. Hinman
    • H04M1100
    • H04M11/062H04L25/085H04M1/738
    • An odd-order low-pass microfilter is disclosed for being interposed between a home telephone wiring network and a POTS, or voice-band, device to separate voice-band signals from higher frequency signals, such as ADSL signals and home networking signals. The filter topology is substantially symmetric so that the filter is reversible in that either end of the filter may be directly coupled to the home telephone wiring network without impairing high frequency signal performance or the filter characteristic of the filter. In one embodiment, the filter is a three-pole filter with a single capacitor disposed between a pair of coupled inductors. Each of the coupled inductors advantageously has an interwinding capacitance over about 100 pF to improve the filter frequency response without increasing the cost of the filter. In another embodiment, the filter is a reversible three-pole filter with a single capacitor disposed between first and second pairs of uncoupled, or discrete, inductors.
    • 公开了一种用于将家庭电话布线网络和POTS或语音频带设备之间插入的奇数低通微过滤器,用于将语音频带信号与诸如ADSL信号和家庭联网信号的较高频率信号分离。 滤波器拓扑基本对称,使得滤波器是可逆的,因为滤波器的任一端可以直接耦合到家庭电话布线网络,而不会损害高频信号性能或滤波器的滤波器特性。 在一个实施例中,滤波器是三极滤波器,其中单个电容器设置在一对耦合电感器之间。 每个耦合电感器有利地具有大约100pF的绕组电容,以提高滤波器频率响应,而不增加滤波器的成本。 在另一个实施例中,滤波器是可逆三极滤波器,其中单个电容器设置在第一和第二对非耦合或离散电感器之间。