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    • 6. 发明申请
    • CORE SYNC MODULE
    • 核心同步模块
    • WO2003047107A2
    • 2003-06-05
    • PCT/US2002/036985
    • 2002-11-15
    • SYMMETRICOM, INC.ZAMPETTI, George P.HAMILTON, Robert
    • ZAMPETTI, George P.HAMILTON, Robert
    • H03L
    • H03L7/07H04J3/0688
    • Systems and methods are described for a core sync module. A method includes receiving a pair of input clock signals; utilizing a stratum clock state machine to control a multiplexer; utilizing the multiplexer to switch an input of a main clock between each of the pair of input clock signals; inducing a phase build-out activity; and transmitting an output clock signal. An apparatus includes a first input clock digital phase-locked loop; a second input clock digital phase-locked loop; a stratum clock state machine coupled to the first input clock digital phase-locked loop and to the second input clock digital phase-locked loop; and a main clock phase-locked loop coupled to the first input clock digital phase-locked loop, to the second input clock digital phase-locked and to the stratum clock state machine.
    • 为核心同步模块描述了系统和方法。 一种方法包括:接收一对输入时钟信号; 利用层时钟状态机来控制多路复用器; 利用多路复用器在一对输入时钟信号中的每一个之间切换主时钟的输入; 引发相位活动; 并发送输出时钟信号。 一种装置包括:第一输入时钟数字锁相环; 第二输入时钟数字锁相环; 层时钟状态机耦合到第一输入时钟数字锁相环和第二输入时钟数字锁相环; 以及耦合到第一输入时钟数字锁相环的主时钟锁相环,到第二输入时钟数字锁相和层时钟状态机。
    • 7. 发明申请
    • GLOBAL POSITIONING SYSTEM RECEIVER CAPABLE OF FUNCTIONING IN THE PRESENCE OF INTERFERENCE
    • 全球定位系统接收机可以在干扰存在的情况下进行功能化
    • WO0177705A3
    • 2002-07-04
    • PCT/US0111431
    • 2001-04-04
    • SYMMETRICOM INCSHENOI KISHANHEINZL JOHANNJACOBSEN GARYYANG JINING
    • SHENOI KISHANHEINZL JOHANNJACOBSEN GARYYANG JINING
    • G01S1/00H03J1/00H03J3/08G01S1/02G01S1/04H04B1/707
    • G01S19/37G01S19/21H03J1/0008H03J3/08H04B1/7102
    • Systems and methods are described for a GPS receiver capable of functioning in the presence of interference. A method includes detecting an interfering signal including: tuning a band pass filter over a frequency range; and at each of a plurality of incremental frequencies; computing a set of band pass filter coefficients; sending the set of band pass filter coefficients to a digital filter; repeatedly transforming an analog-to-digital converter output having a quantization level in excess of 2 bits into a band pass filter output with the digital filter to obtain a plurality of samples; computing an average of the plurality of samples; and comparing the average to a threshold to detect peaks that exceed a threshold. An apparatus, comprising: an analog radio frequency circuit; an analog-to-digital converter coupled to the analog radio frequency circuit, the analog-to-digital converter providing a quantization level in excess of 2 bits; a digital filter coupled to the analog-to-digital converter; and a digital circuit coupled to the digital filter.
    • 为能够在存在干扰的情况下起作用的GPS接收机描述系统和方法。 一种方法包括检测干扰信号,包括:在频率范围上调谐带通滤波器; 并且在多个增量频率中的每一个处; 计算一组带通滤波器系数; 将一组带通滤波器系数发送到数字滤波器; 将具有超过2位的量化级的模数转换器输出反复变换为与数字滤波器一起输出的带通滤波器,以获得多个采样; 计算所述多个样本的平均值; 并将平均值与阈值进行比较以检测超过阈值的峰值。 一种装置,包括:模拟射频电路; 耦合到所述模拟射频电路的模数转换器,所述模数转换器提供超过2位的量化级; 耦合到所述模数转换器的数字滤波器; 以及耦合到数字滤波器的数字电路。
    • 9. 发明申请
    • RADIO COMMUNICATION APPARATUS
    • 无线电通信设备
    • WO1997037401A2
    • 1997-10-09
    • PCT/GB1997000841
    • 1997-03-26
    • SYMMETRICOM, INC.LEISTEN, Oliver, Paul
    • SYMMETRICOM, INC.
    • H01Q11/12
    • H01Q11/08H01Q5/357
    • In a radio communication system operating in at least two spaced-apart frequency bands above 200 MHz, a quadrifilar helical antenna (1) having an elongate dielectric core with a relative dielectric constant greater than 5 has a conductive sleeve surrounding a proximal part of the core and a longitudinal feeder structure (1A) extending through the core to a connection with the helical antenna elements at a distal end of the core. The antenna (1) is operated in a first frequency band in which it exhibits a first, balanced mode of resonance characterised by current maxima and voltage minima at the connections of the helical elements to the feeder structure and at their junctions with the rim of the sleeve, and in a lower or higher second frequency band in which the antenna (1) exhibits a second, single-ended mode of resonance characterised by current maxima and voltage minima generally at the ends of the core and current minima and voltage maxima at one or more intermediate locations. To permit dual mode operation, the system includes an impedance-matching coupling stage (2) which may be a diplexer having filters coupled between a common port for the antenna (1) and further ports for connection to radio signal processing equipment such as a GPS receiver (4) and a mobile telephone (5) operating in the two frequency bands. The filters and impedance matching elements may be formed as microstrip elements on a single substrate.
    • 在高于200MHz的至少两个间隔开的频带中操作的无线电通信系统中,具有大于5的相对介电常数的细长介质芯的四极螺旋天线(1)具有包围芯的近端部分的导电套筒 以及纵向进给结构(1A),其延伸穿过所述芯到与所述芯的远端处的所述螺旋天线元件的连接。 天线(1)在第一频带中操作,其中它呈现出第一平衡谐振模式,其特征在于在螺旋元件到馈线结构的连接处的电流最大值和电压最小值,以及在与 并且在较低或更高的第二频带中,其中天线(1)呈现第二单端谐振模式,其特征在于通常在芯的端部处的电流最大值和电压最小值,并且电流最小值和电压最大值在一个 或更多的中间位置。 为了允许双模式操作,该系统包括阻抗匹配耦合级(2),其可以是具有耦合在用于天线(1)的公共端口之间的滤波器的另一端口和用于连接到诸如GPS的无线电信号处理设备 接收器(4)和在两个频带中操作的移动电话(5)。 滤波器和阻抗匹配元件可以在单个衬底上形成为微带元件。
    • 10. 发明申请
    • ASSISTED WALL-CLOCK
    • 辅助墙壁时钟
    • WO2008103170A1
    • 2008-08-28
    • PCT/US2007/062452
    • 2007-02-20
    • SYMMETRICOM, INC.SHENOI, KishanZAMPETTI, George, P.
    • SHENOI, KishanZAMPETTI, George, P.
    • H04J3/06
    • H04L12/413G06F1/14H04J3/0664H04J3/0667
    • One embodiment of the present invention sets forth a method for extracting a frequency reference carried in the physical layer of the incoming signal, using it to stabilize the local oscillator, and generating a suitable estimate of the clock correction to obtain an accurate time-of-day information from the client wall-clock of a computing device. The enhanced Jam-Sync method includes the steps of performing iterations to derive the estimates of the time offset between the true time-of-day and the System Time Clock (STC) in the forward and reverse directions of data transmission and calculating an estimate of the overall clock correction value. With these steps, the negative effects of packet delay variation may be mitigated and a value necessary for correcting the STC within the client wall-clock is determined. Consequently, quality control of the client wall-clock is achieved at significantly reduced cost and decreased level of complexity relative to the prior art approaches.
    • 本发明的一个实施例提出了一种用于提取输入信号的物理层中承载的频率参考的方法,使用它来稳定本地振荡器,并且产生适当的时钟校正估计以获得准确的时间 - 来自计算设备的客户端时钟的日间信息。 增强的Jam-Sync方法包括以下步骤:执行迭代以得出数据传输的正向和反向方向上的真实时间与系统时间时钟(STC)之间的时间偏移的估计,并且计算估计值 整体时钟校正值。 通过这些步骤,可以减轻分组延迟变化的负面影响,并且确定用于校正客户端挂钟内的STC所需的值。 因此,相对于现有技术的方法,以显着降低的成本和降低的复杂程度来实现客户端时钟的质量控制。