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首页> 外文期刊>Journal of Computers >A Novel Pulse Echo Correlation Tool for Transmission Path Testing and Fault Diagnosis
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A Novel Pulse Echo Correlation Tool for Transmission Path Testing and Fault Diagnosis

机译：一种新型脉冲回波相关工具，用于传输路径测试和故障诊断

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—In this paper a novel pulse sequence testing methodology is presented [22] as an alternative to Time Domain Reflectometry (TDR) for transmission line health condition monitoring, faultfinding and location. This scheme uses Pseudo Random Binary Sequence (PRBS) injection for transmission line testing and fault location with cross correlation (CCR) techniques to build a unique response profile, as a characteristic signature, to identify the type of fault, if any, or load termination present as well as its distance from the point of stimulus insertion. This fault characterization strategy can be applied to a number of industrial application scenarios embracing high frequency (HF) printed circuit board (PCB) and integrated circuit (IC) device operation, overhead lines and underground cables in inaccessible locations, which rely on a transmission line pathway or via common to all cases either for signal propagation or power conveyance. As an improved time-domain methodology PRBS enabled fault finding can be performed online at low amplitude levels for normal uncorrelated signal traffic disturbance rejection and to average out the presence of transmission link extraneous noise pickup over several PRBS cycles for the purpose of multiple fault coverage, resolution and identification. This unique troubleshooting tool is due to the perturbation of the transmission line with a special pseudonoise (pN) sequence of uncorrelated pulses of random polarity and the subsequent CCR measurement of their aggregate response at the test node input for line fault identification and localisation. Based on the distinct spike-like attribute of the PRBS autocorrelation (ACR) function, a pre-location fault measurement relies on the relative time displacement of the device/system conditioned PRBS cross-correlated echo response from the ACR peak for accurate fault/load location and identification. This measured time translation of the correlation peaks can be subsequently used to determine the propagation delay of the reflected response from the fault/load-termination of the unit under test (UUT). This procedure not only results in fault/load parameter identification but also of the reflection transit time from the fault interface and thus the distance of the fault from the point of stimulus insertion. In this paper a lumped parameter circuit model is presented to emulate generalized transmission line, using the wellknown pSpice simulation package, for a range of known loadterminations mimicking fault conditions in a range of application scenarios encountered in practice. Numerous line behavioural simulations for various fault conditions, known apriori, with measured CCR response demonstrate the capability of and establishes confidence in the effectiveness of the PRBS test method in fault type identification and location. The accuracy of the method is further validated through theoretical calculation using known lumped parameters, fault termination conditions and link distance in transmission line simulation.
机译：- 本文将一种新颖的脉冲序列测试方法呈现[22]作为时域反射率（TDR）的替代方案，用于传输线路健康状况监测，故障文件和位置。该方案使用伪随机二进制序列（PRBS）注射用于传输线路测试和故障位置，具有互相关（CCR）技术来构建唯一的响应配置文件，作为特征签名，以识别故障类型，如果有的话或负载终止目前以及距离刺激点的距离。该故障表征策略可以应用于许多工业应用方案，拥有高频（HF）印刷电路板（PCB）和集成电路（IC）设备操作，架空线和地下电缆在无法访问的位置，依赖于传输线途径或通过用于信号传播或电力输送的所有情况。作为改进的时域方法，PRBS启用的故障查找可以在线在线执行，以便在普通不相关信号流量干扰抑制的低幅度水平上进行，并且平均出现在几个PRBS周期上的传输链路外来噪声拾取的存在以进行多个故障覆盖，解决和识别。这种独特的故障排除工具是由于传输线的扰动，具有特殊的伪孔（PN）的随机极性的不相关脉冲序列和随后的CCR测量在测试节点输入的用于线路故障识别和定位。基于PRBS自相关（ACR）函数的不同峰值类属性，预先定位故障测量依赖于设备/系统的相对时间位移，从ACR峰值从ACR峰值进行互相关回声响应，以准确故障/负载位置和识别。随后可以使用相关峰值的测量时间转换来确定来自被测单元的故障/负载终止的反射响应的传播延迟（UUT）。此过程不仅导致故障/加载参数识别，而且还导致来自故障界面的反射传输时间，从而从刺激点插入的点距离。在本文中，提出了一种集总参数电路模型以模拟广义传输线，使用众所周知的PSPICE仿真包，用于一系列已知的LoadterMinations模仿在实践中遇到的应用方案范围内的故障条件。具有测量CCR响应的各种故障条件的许多线行为模拟，具有测量的CCR响应，证明了在故障类型识别和位置中PRBS测试方法的有效性的能力和建立置信度。通过使用已知的集总参数，故障终止条件和传输线模拟中的链路距离进行理论计算，进一步验证了该方法的准确性。

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