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公开(公告)号：US4389612A
公开(公告)日：1983-06-21
申请号：US160225
申请日：1980-06-17
IPC分类号： G01R19/00 , G01R33/035 , G01R33/02
CPC分类号： G01R33/0356 , Y10S505/846
摘要： A circuit for reducing low frequency noise in a direct current biased superconducting quantum interference device. A squarewave bias signal having no dc component is used to bias the two junctions of the dc SQUID. At the same time, the magnetic flux in the SQUID is modulated to heterodyne the input signals up to some convenient frequency where they may be amplified without concern for drift. Final demodulation automatically adjusts for the fact that the relative phase is reversed each time the squarewave bias changes polarity states.
摘要翻译： 用于降低直流偏置超导量子干涉装置中的低频噪声的电路。 没有直流分量的方波偏置信号用于偏置直流SQUID的两个结。 同时，SQUID中的磁通量被调制成外差输入信号直到一些方便的频率，在这些频率下它们可以被放大而不用担心漂移。 每次方波偏置改变极性状态时，最终解调都会自动调整相位相位相反的事实。
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公开(公告)号：US4004217A
公开(公告)日：1977-01-18
申请号：US627703
申请日：1975-10-31
申请人： Robin P. Giffard
发明人： Robin P. Giffard
IPC分类号： G01R33/035 , G01R33/02
CPC分类号： G01R33/0356 , Y10S505/846
摘要： A flux locked loop, employing a squid in connection with the production of the locked-loop error signal, includes circuitry which renders the locked loop more immune to disturbance inputs such as a ground-loop noise and interference transients and which facilitates a scale factor adjustment of a sub-carrier drive signal for the squid. To minimize ground-loop noise disturbance effects, a portion of the circuitry in the feedback path of the locked loop includes a voltage-responsive converter circuit arrangement providing a current-drive feedback signal for coupling to the squid. To minimize interference transient disturbance effects, a portion of the circuitry in the forward path of the locked loop includes a circuit arrangement having a non-linear transfer characteristic defining opposed substantial attenuation regions separated by a generally linear gain region. To facilitate adjustment of the scale factor to a desired value, a portion of the circuitry provides for an open-loop operation in which a test-mode oscillating signal is coupled to the squid along with an operating-mode modulation drive signal. This causes a heterodyning process to take place such that the frequency spectrum of the electrical signal does not contain frequency components at or near the frequency of the test-mode oscillating signal under circumstances in which the modulation drive signal has been adjusted to the desired value.
摘要翻译： 与产生锁定环路误差信号相结合的鱿鱼的磁通锁定环路包括电路，其使得锁定环更免于诸如接地环路噪声和干扰瞬变之类的干扰输入，并且有利于比例因子调整 的鱿鱼的副载体驱动信号。 为了最小化接地环路噪声干扰效应，锁定环路的反馈路径中的电路的一部分包括提供用于耦合到鱿鱼的电流驱动反馈信号的电压响应转换器电路装置。 为了最小化干扰瞬态干扰效应，锁定环路的前向路径中的电路的一部分包括具有限定由大致线性增益区域分开的相对的实质衰减区域的非线性传输特性的电路装置。 为了便于将比例因子调整到期望值，电路的一部分提供开环操作，其中测试模式振荡信号与操作模式调制驱动信号一起耦合到鱿鱼。 这导致进行外差处理，使得在将调制驱动信号调节到期望值的情况下，电信号的频谱不包含在测试模式振荡信号的频率处或其附近的频率分量。
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3.发明授权
公开(公告)号：US5729181A
公开(公告)日：1998-03-17
申请号：US702075
申请日：1996-08-23
申请人： Leonard S. Cutler , Richard K. Karlquist , James R. Collin , James L. Johnson , Theodore Parisek , Robin P. Giffard
发明人： Leonard S. Cutler , Richard K. Karlquist , James R. Collin , James L. Johnson , Theodore Parisek , Robin P. Giffard
CPC分类号： H03L1/04 , G05D23/1931 , G05D23/24
摘要： An oven assembly for a crystal resonator and oscillator utilizes a thermally symmetrical design to provide a high thermal gain. The oven assembly includes an encasement that forms a hermetically sealed oven chamber that is substantially cylindrical. Concentric with the oven chamber is an annular oven mass that functions as a heat reservoir for the crystal resonator that is contained within the oven mass. The cylindrical oven chamber and the concentric annular oven mass provide two levels of circular symmetry that help achieve a thermally isotropic oscillator environment. Wide-area uniform heat transfer promotes high thermal gain and minimizes thermal gradients. Another factor is the geometry and circuitry for temperature monitoring. Temperature sensors are equidistantly spaced from each other and are equidistant from the center of the oven chamber. Signals from the various thermistors are averaged to provide a more accurate temperature determination for regulating the heaters.
摘要翻译： 用于晶体谐振器和振荡器的烤箱组件利用热对称设计来提供高热增益。 烤箱组件包括形成基本上圆柱形的气密密封的烤箱室的外壳。 与烤箱室同心的是一种环形烤箱，用作包含在烤箱中的晶体谐振器的储热器。 圆柱形烤箱室和同心环形烤箱质量提供了两个等级的圆形对称，有助于实现热各向同性的振荡器环境。 广泛的均匀传热促进了高的热增益并使热梯度最小化。 另一个因素是温度监测的几何和电路。 温度传感器彼此距离相等并且距离烘箱的中心等距。 将各种热敏电阻的信号平均，以提供更准确的温度测定来调节加热器。
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4.发明授权Method and apparatus for autonomously measuring ionospheric delay and single-frequency, GPS time receiver incorporating same 失效用于自主测量电离层延迟和单频GPS方式和装置，GPS时间接收机并入其中公开(公告)号：US06407700B1
公开(公告)日：2002-06-18
申请号：US09731079
申请日：2000-12-05
申请人： Robin P. Giffard
发明人： Robin P. Giffard
IPC分类号： H04R7185
CPC分类号： G01S19/235 , G01S19/40
摘要： The ionospheric delay of a GPS signal transmitted by a first satellite having an obliquity is measured autonomously and substantially in real-time by receiving a code range, a carrier phase range and a satellite elevation angle for each of at least two satellites. For each of the at least two satellites, a code-phase divergence between the code range and the carrier phase range is calculated, an obliquity is calculated from the satellite elevation angle and time derivatives of the code-phase divergence and of the obliquity are calculated. A zenith delay is calculated from the obliquities, the time-derivatives of the obliquities and the time-derivatives of the code-phase divergences of the at least two satellites. The ionospheric delay is calculated by multiplying the obliquity of the first satellite and the zenith delay.
摘要翻译： 由具有倾斜度的第一卫星发射的GPS信号的电离层延迟通过接收至少两颗卫星中的每一个的码范围，载波相位范围和卫星仰角自动且基本上被实时地测量。 对于至少两个卫星中的每一个，计算码范围和载波相位范围之间的码相位偏差，从卫星仰角计算倾斜度，并计算码相位散度和倾斜度的时间导数 。 天顶延迟是从倾斜度，至少两颗卫星的码相位偏差的倾斜时间导数和时间导数计算出来的。 通过乘以第一颗卫星的倾角和天顶延迟来计算电离层延迟。
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公开(公告)号：US5566180A
公开(公告)日：1996-10-15
申请号：US360508
申请日：1994-12-21
申请人： John C. Eidson , Joseph A. Dara-Abrams , Stanley P. Woods , Leonard S. Cutler , Robin P. Giffard , James L. Johnson
发明人： John C. Eidson , Joseph A. Dara-Abrams , Stanley P. Woods , Leonard S. Cutler , Robin P. Giffard , James L. Johnson
CPC分类号： H04J3/0667 , G06F1/14 , H04J3/0673 , H04J3/0697
摘要： The local clocks within each node of a loosely distributed network system may be synchronized and syntonized by any of the nodes in the network. Each of the nodes contains a time packet detector (TPD) that detects and recognizes timing data packets and produces a recognition signal. This signal may be used to cause an action in the detecting node, in particular the node may contain a time service block (TSB) containing a local clock that may be used to record the time of the recognition signal. The recorded times may be used as the basis for correcting the local clocks of the nodes in the system. Transfer devices such as gateways, bridges, and routers may include TSBs and TPDs to allow for correction for the transit time of time packets through the transfer device. The TPD is normally connected within the media access device at the point of final encoding for transmission or recovery of the clock and data for receiving where the time jitter will be at a minimum.
摘要翻译： 松散分布的网络系统的每个节点内的本地时钟可以被网络中的任何节点同步和合成。 每个节点包含检测并识别定时数据分组并产生识别信号的时间包检测器（TPD）。 该信号可以用于在检测节点中引起动作，特别地，节点可以包含包含可用于记录识别信号的时间的本地时钟的时间服务块（TSB）。 记录时间可以用作校正系统中节点的本地时钟的基础。 诸如网关，桥接器和路由器的传输设备可以包括TSB和TPD，以允许通过传送设备校正时间分组的传输时间。 TPD通常在最终编码的时刻连接在媒体接入设备内，用于时钟的发送或恢复，以及用于接收时间抖动最小的数据。
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公开(公告)号：US4784489A
公开(公告)日：1988-11-15
申请号：US43906
申请日：1987-04-29
CPC分类号： G01B9/02007 , G01B9/02002 , G01B9/02067 , G01J9/02 , G01B2290/70 , G01J2009/0226
摘要： A remote receiver for laser interferometer systems is split into two parts connected by a fiber optic link. The front-end of the receiver, located near the remote interferometer optics, houses only the optical components for focusing and mixing the laser beam, and transmits the beam through an optical fiber cable. The back-end of the receiver, located remotely, houses the electronic components for detecting and measuring the frequency difference to produce the signal for the measurement electronics.
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