公开(公告)号：US06735242B1

公开(公告)日：2004-05-11

申请号：US09386060

申请日：1999-08-30

申请人： Thomas J. Kenney ,  Weiping Xu

发明人： Thomas J. Kenney ,  Weiping Xu

IPC分类号： H04B7216

CPC分类号： H04B1/7085 ,  H04B2201/70701

摘要： A novel design of, and method of operation for, a coherent delay lock loop (DLL) for communication systems that employ a pilot channel or pilot symbols is disclosed. Pilot information is used to produce an estimate of signal phase and thereby remove the need for the magnitude operation within the DLL arms. The disclosed design and method afford better time-tracking performance by avoiding the squaring loss (due to the magnitude operation) encountered in noncoherent DLL designs. Alternative embodiments disclose designs and methods that are robust to signal amplitude variation. A first alternative normalizes a DLL error signal by a computed estimate of the squared magnitude of the pilot signal. A second alternative normalizes the error signal using only the early and late signals and therefore is applicable for noncoherent DLL designs as well as coherent DLL designs.

摘要翻译： 公开了一种用于采用导频信道或导频符号的通信系统的相干延迟锁定环（DLL）的新颖设计和操作方法。 导频信息用于产生信号相位的估计，从而消除对DLL臂内的幅度操作的需要。 所公开的设计和方法通过避免在非相干DLL设计中遇到的平均损耗（由于幅度操作）而提供更好的时间跟踪性能。 替代实施例公开了对信号幅度变化而鲁棒的设计和方法。 第一替代方案是通过计算出的导频信号幅度的平均值的估计来对DLL错误信号进行归一化。 第二种替代方案仅使用早期和晚期信号来规范误差信号，因此适用于非相干DLL设计以及相干DLL设计。

公开(公告)号：US07323434B2

公开(公告)日：2008-01-29

申请号：US10719235

申请日：2003-11-21

申请人： Changming Su ,  Rushan Liu ,  Weiping Xu ,  Zengchen Guan ,  Peizhi Yu ,  Xiushan Liu ,  Jiafen Li ,  Baoyu Guo ,  Yingchun Cui ,  Caixuan Guo ,  Jing Li

发明人： Changming Su ,  Rushan Liu ,  Weiping Xu ,  Zengchen Guan ,  Peizhi Yu ,  Xiushan Liu ,  Jiafen Li ,  Baoyu Guo ,  Yingchun Cui ,  Caixuan Guo ,  Jing Li

IPC分类号： C09K8/18

CPC分类号： C09K8/20 ,  C09K8/24

摘要： An electropositive and water-based production well treating fluid system exhibits electropositivity by using a cationic viscosifier meanwhile matched with a cationic fluid loss additive and, optionally, contains a mud-building agent, an electrical stabilizing agent, a colloid-stabilizing agent, lubricant, an oil layer protective agent and/or a weighting agent. The electropositive production well treating fluid can beffer solve the contradiction of technical requirements between “treating fluid stability” and “bore hole stability”, and features a strong ability to inhibit the dispersion of clay, a good effect of protecting oil-gas reservoirs, fast drilling speeds, regular shape of bore holes and good resistance to salt.

摘要翻译： 正电和水基生产井处理流体系统通过使用阳离子增粘剂同时与阳离子流体损失添加剂匹配而显示正电性，并且任选地含有制泥剂，电稳定剂，胶体稳定剂，润滑剂， 油层保护剂和/或加重剂。 电解生产井处理液可以解决“处理流体稳定性”和“钻孔稳定性”之间的技术要求的矛盾，具有很强的抑制粘土分散的能力，保护油气藏效果好，快速 钻孔速度快，钻孔规则形状，耐盐性好。