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1.发明申请Method and system for recovering information from a magnetic field signal usable for locating an underground object 有权用于从可用于定位地下物体的磁场信号中恢复信息的方法和系统公开(公告)号：US20030058961A1
公开(公告)日：2003-03-27
申请号：US09918724
申请日：2001-08-01
发明人： Richard W. Fling , Luigi Lanfranchi
IPC分类号： H04L027/06 , H04L027/14 , H04L027/22
摘要： A data recovery subsystem for use in a receive system configured to receive a magnetic field signal, the magnetic field signal including a carrier component usable for locating an underground object and at least one modulation sideband. The data recovery subsystem includes a first mixer to mix a Radio Frequency (RF) signal with a first Local Oscillator (LO) signal to produce an Intermediate Frequency (IF) signal representative of the magnetic field signal. A Phase Locked Loop (PLL) phase-locks a second LO signal to an IF carrier component of the IF signal. A second mixer synchronously mixes the IF signal with the second LO signal to produce a baseband signal including a demodulated sideband.
摘要翻译： 一种用于接收系统的数据恢复子系统，被配置为接收磁场信号，所述磁场信号包括可用于定位地下物体的载波分量和至少一个调制边带。 数据恢复子系统包括将射频（RF）信号与第一本地振荡器（LO）信号混合以产生表示磁场信号的中频（IF）信号的第一混频器。 锁相环（PLL）将第二LO信号锁相到IF信号的IF载波分量。 第二混频器将IF信号与第二LO信号同步混频以产生包括解调侧边带的基带信号。
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公开(公告)号：US20150097569A1
公开(公告)日：2015-04-09
申请号：US14046586
申请日：2013-10-04
IPC分类号： G01V3/08
摘要： A locator for locating a buried electromagnetic marker is operable to generate a test signal in order to validate that the locator is operating in accordance with calibration data. The locator comprises a transmission antenna and a first reception antenna. The transmission antenna is configured to generate a first oscillatory magnetic field to couple with an electromagnetic marker and the first reception antenna is configured to receive an oscillatory magnetic field emitted by the electromagnetic marker. In order to validate the operation of the locator, the transmission antenna is configured to generate a test oscillatory magnetic field, and the first reception antenna is configured to receive the test oscillatory magnetic field and thereby generate a first detected test signal.
摘要翻译： 用于定位埋地电磁标记的定位器可操作以产生测试信号，以便根据校准数据验证定位器的操作。 定位器包括发射天线和第一接收天线。 发送天线被配置为产生与电磁标记耦合的第一振荡磁场，并且第一接收天线被配置为接收由电磁标记发射的振荡磁场。 为了验证定位器的操作，发送天线被配置为产生测试振荡磁场，并且第一接收天线被配置为接收测试振荡磁场，从而生成第一检测到的测试信号。
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公开(公告)号：US20040004479A1
公开(公告)日：2004-01-08
申请号：US10609504
申请日：2003-07-01
IPC分类号： G01V003/08
摘要： Cathodic protection voltages are used to resist the damage to pipes or cables from electrolytic effects. However, localised fields can lead to stray currents and may result in corrosion and it is therefore desirable to detect and analyse those stray currents. Frequently there are several pipes in the area of interest and so it is necessary to distinguish between those pipes. Therefore the cathodic voltage on the pipes is modulated, with different pipes having different modulations. This modulation may be applied using an interrupter. Orthogonal modulations with non-unitary aspect ratios improve the discrimination between the pipes whilst maximising the energy content of the modulation pattern. The analysis is improved when the interrupters are synchronised with each other and so repeating on the same time-base. This synchronisation may be achieved using an external time signal such as GPS. An interrupter which can be used in this regard is also proposed, and may be powered from the cathodic voltage itself.
摘要翻译： 阴极保护电压用于抵抗管道或电缆对电解效应的损害。 然而，局部场地可能导致杂散电流并且可能导致腐蚀，因此希望检测和分析那些杂散电流。 通常在感兴趣的区域有几条管道，因此有必要区分这些管道。 因此，管道上的阴极电压被调制，不同的管道具有不同的调制。 可以使用中断器来应用该调制。 具有非单位宽高比的正交调制改善了管道之间的区别，同时使调制图案的能量含量最大化。 当断路器彼此同步并且在相同的时基上重复时，分析得到改善。 可以使用诸如GPS的外部时间信号来实现该同步。 还提出了可以在这方面使用的中断器，并且可以由阴极电压本身供电。
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公开(公告)号：US20030155922A1
公开(公告)日：2003-08-21
申请号：US10076089
申请日：2002-02-15
IPC分类号： G01V003/10 , G01R025/00 , G01V003/08
CPC分类号： G01V3/081
摘要： A system and method to locate electronic marker balls includes receiving a signal representative of a detected marker ball. The signal includes the resolved in-phase and quadrature-phase (I and Q) components, each centered about a first frequency. The I and Q components are filtered in order to shift the first frequency to a second frequency and match the second frequency I and Q components to exponential decay characteristics associated with the marker balls. The second frequency I and Q components phase integrated in order to distinguish the components from noise. The integrating is based upon predetermined gain coefficients and produces integrated I and Q components in accordance with the predetermined gain coefficients. Next, a magnitude of the integrated I and Q components is determined to produce an I and Q magnitude vector and a noise variance associated with the magnitude vector is determined. Finally, the recursive coefficients are adjusted in accordance with the determined noise variance.
摘要翻译： 用于定位电子标记球的系统和方法包括接收表示检测到的标记球的信号。 信号包括解析的同相和正交相（I和Q）分量，每个分量以第一频率为中心。 对I和Q分量进行滤波，以便将第一频率移动到第二频率，并将第二频率I和Q分量匹配成与标记球相关联的指数衰减特性。 第二个频率I和Q分量相位积分，以区分分量与噪声。 积分基于预定的增益系数，并根据预定的增益系数产生积分的I和Q分量。 接下来，确定积分I和Q分量的大小以产生I和Q幅度矢量，并且确定与幅度矢量相关联的噪声方差。 最后，根据确定的噪声方差来调整递归系数。
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公开(公告)号：US20210231722A1
公开(公告)日：2021-07-29
申请号：US17232246
申请日：2021-04-16
发明人： Mark MARSDEN , Peter MANN , Charles ALEXANDER , Jeff THOMPSON
IPC分类号： G01R31/08
摘要： Methods, systems and locators for detecting faults in an insulation later of an insulated conductor buried beneath a ground surface are described. The locator comprises a magnetometer arranged to detect a magnetic field generated by the alternating current and to generate a current signal on the basis of the detected magnetic field, and an Alternating Voltage Gradient receiver comprising a pair of probes arranged to make electrical contact with the ground surface, which is arranged to generate a voltage signal indicative of a voltage between the pair of probes. A processor is configured to substantially synchronously sample the current signal and the voltage signal. This enables improved detection of faults in the insulation layer of the insulated conductor.
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公开(公告)号：US20030158708A1
公开(公告)日：2003-08-21
申请号：US10076104
申请日：2002-02-15
发明人： Nicholas J. Frost , Jason J. Hanlon , Andrew B. Lewis , Stephen E. Ridley , Michael J. Morgan , Marcus Baker , Gary P. Hiscox , Richard D. Pearson
IPC分类号： G06F015/00
CPC分类号： H04L41/0806 , H04L41/024 , H04L41/0253 , H04L41/12
摘要： A remotely configurable locator system includes a detection device to locate concealed underground conductors. The detection device is configured to connect to a communications network via a graphical user interface. Also included is a database management tool configured to connect to the communications network and communicate with the detection device via the communications network. A database is included and is adapted to store data related to the detection device wherein the data is configured to be accessed by the database management tool. Finally, the graphical user interface is configured to permit a user to remotely perform one of updating, analyzing, and diagnosing the detection device based upon the accessed stored data.
摘要翻译： 可远程配置的定位系统包括一个检测装置，用于定位隐藏的地下导体。 检测装置被配置为经由图形用户界面连接到通信网络。 还包括数据库管理工具，其被配置为连接到通信网络并且经由通信网络与检测设备通信。 包括数据库，并适于存储与检测装置相关的数据，其中数据被配置为由数据库管理工具访问。 最后，图形用户界面被配置为允许用户基于所访问的存储的数据来远程执行更新，分析和诊断检测设备之一。
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公开(公告)号：US20030058126A1
公开(公告)日：2003-03-27
申请号：US09918714
申请日：2001-08-01
IPC分类号： G01V003/00
CPC分类号： G01V3/08 , H04L25/03006
摘要： Method and systems for reducing effects of magnetic field interference that may interfere with a magnetic field signal generated at or near an underground object, where the magnetic field signal is used to monitor the location of the underground object. At least two different moving averages of a plurality of samples that are representative of a detected magnetic field signal strength are produce. Each of the different moving averages is a moving average of a different number of the plurality of samples. A respective quality metric (e.g., variance) is then determined for each of the different moving average. One of the moving averages is selected based on the determined quality metrics. Further signal processing is then performed using the selected moving average. For example, the selected moving average is used to monitor the location of the object.
摘要翻译： 用于减少可能干扰在地下物体处或附近产生的磁场信号的磁场干扰影响的方法和系统，其中磁场信号用于监测地下物体的位置。 产生代表检测到的磁场信号强度的多个样本的至少两个不同的移动平均值。 不同移动平均线中的每一个是多个样本的不同数量的移动平均值。 然后针对不同的移动平均值中的每个确定相应的质量度量（例如，方差）。 基于所确定的质量度量来选择移动平均线之一。 然后使用所选择的移动平均线执行进一步的信号处理。 例如，所选择的移动平均值用于监视对象的位置。
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公开(公告)号：US20040118219A1
公开(公告)日：2004-06-24
申请号：US10324016
申请日：2002-12-20
发明人： Jeffrey Pollard
IPC分类号： G01F001/37
CPC分类号： G01F1/40 , F16K5/0605
摘要： A method and apparatus includes a multi-position valve that restricts the air flow when the valve is placed in one position. Pressure tap valves are located are the inlet and outlet ports to measure the pressure differential and thereby determine the airflow rate.
摘要翻译： 一种方法和装置包括一个多位置阀门，当阀门被放置在一个位置时，该多位置阀限制空气流动。 压力分接阀位于入口和出口端口，用于测量压力差，从而确定气流速率。
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公开(公告)号：US20030158729A1
公开(公告)日：2003-08-21
申请号：US10076086
申请日：2002-02-15
IPC分类号： G10L019/14
摘要： Methods and systems for digitally generating sound from phase and amplitude information of a narrow bandwidth signal, such as a narrow bandwidth locator signal. Phase-derivative information is determined from the phase information. The bandwidth of the phase-derivative information is spread out, or stretched, over a wider bandwidth, so that the frequency variations will be more perceptible to users. The result is combined with an audio band carrier frequency, the result of which controls an oscillator. The oscillator output is combined with the amplitude information to generate an analog audio signal that is modulated with the amplitude information and the phase-derivative information. The amplitude information wider bandwidth phase-derivative information are used to modulate an audio carrier in both frequency and amplitude. The overall process can be thought of as a translation of the frequency and amplitude information from the narrow bandwidth around the locate frequency to a wider bandwidth on a chosen carrier frequency in the audio band. The received amplitude and phase information is received at an input sample rate. Where the input sample rate is relatively low, the amplitude and phase information are up-sampled to an output sample rate that is higher than a desired audio frequency. The higher output sample rate insures that there are sufficient samples of the signal during each cycle or period of the audio frequency. The higher sample rate is typically also the sample rate of a digital to analog converter that outputs an analog signal to a speaker. The amplitude information and/or phase derivative information are optionally scaled to system gain. The sound heard by the operator can optionally be adjusted with an optional selectivity filter.
摘要翻译： 用于从诸如窄带宽定位信号的窄带宽信号的相位和振幅信息中数字产生声音的方法和系统。 从相位信息确定相位导数信息。 相位导数信息的带宽在更宽的带宽上扩展或拉伸，使得频率变化对于用户来说将更为可见。 结果与音频载波频率相结合，其结果控制振荡器。 振荡器输出与幅度信息组合，以产生用振幅信息和相位导数信息调制的模拟音频信号。 振幅信息较宽的带宽相位微分信息用于调制频率和幅度的音频载波。 整个过程可以被认为是频率和幅度信息从定位频率周围的窄带宽到音频频带中所选择的载波频率上的较宽带宽的转换。 接收的幅度和相位信息以输入采样率被接收。 在输入采样率相对低的情况下，幅度和相位信息被上采样到高于期望音频的输出采样率。 较高的输出采样率确保在每个周期或音频周期期间有足够的信号样本。 更高的采样率通常也是将模拟信号输出到扬声器的数模转换器的采样率。 幅度信息和/或相位导数信息可选地被缩放到系统增益。 操作员听到的声音可以选择性地用可选的选择性过滤器进行调节。
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公开(公告)号：US20030155983A1
公开(公告)日：2003-08-21
申请号：US10076103
申请日：2002-02-15
发明人： John M. Royle
IPC分类号： H03L007/00
CPC分类号： G06F1/022 , G06F2101/04
摘要： A digital phase-quadrature oscillator generates a series of sine values representative of a sine wave, and a series of cosine values representative of a cosine wave. In each iteration of the oscillator, a sum of the squares of past sine and cosine values is used as a negative feedback term in synthesizing next sine and cosine values, in order to stabilize the amplitudes of the sine and cosine values.
摘要翻译： 数字相位正交振荡器产生代表正弦波的一系列正弦值和代表余弦波的一系列余弦值。 在振荡器的每个迭代中，过去的正弦和余弦值的平方和之和被用作合成下一个正弦和余弦值的负反馈项，以便稳定正弦和余弦值的振幅。
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