公开(公告)号：US08120507B2

公开(公告)日：2012-02-21

申请号：US12410578

申请日：2009-03-25

申请人： Robert E. Rouquette ,  Clem B. Guillot, III ,  Robert H. Kemp, Jr. ,  Dale J. Lambert ,  Daniel B. Seale

发明人： Robert E. Rouquette ,  Clem B. Guillot, III ,  Robert H. Kemp, Jr. ,  Dale J. Lambert ,  Daniel B. Seale

IPC分类号： H04L25/20 ,  H04L5/14 ,  H04B13/02

CPC分类号： H04B3/36

摘要： A two-tier communication system for a seismic streamer. The communication system operates over an unshielded twisted-pair communication line extending the length of the streamer. Repeater units having a repeater function and a device controller function divide the twisted pair into line segments. Coils on each segment couple signals inductively to collocated external devices in a low-speed 2400 baud FSK data link between the devices and an associated device controller. A Gaussian 8-level FSK high-speed 60 kbit/s data link is established along all the segments with the repeaters re-transmitting boosted signals along the entire length of the communication line. The coils are transparent at the high-speed data rate. Time division multiple access (TDMA) or frequency division multiple access (FDMA) is used to accommodate the two links on the single twisted pair.

摘要翻译： 一种用于地震拖缆的双层通信系统。 通信系统通过延长拖缆长度的非屏蔽双绞线通信线路进行操作。 具有中继器功能的中继器单元和设备控制器功能将双绞线划分为线段。 每个段上的线圈在设备和相关设备控制器之间的低速2400波特FSK数据链路中感应地感应到并置的外部设备。 沿着所有段建立高斯8级FSK高速60kbit / s数据链路，中继器沿着通信线路的整个长度重新发送升压信号。 线圈在高速数据速率下是透明的。 时分多址（TDMA）或频分多址（FDMA）用于容纳单个双绞线上的两个链路。

公开(公告)号：US5359575A

公开(公告)日：1994-10-25

申请号：US118076

申请日：1993-09-08

申请人： Ross E. Williams ,  Bryant G. Ragan ,  Robert H. Kemp, Jr.

发明人： Ross E. Williams ,  Bryant G. Ragan ,  Robert H. Kemp, Jr.

IPC分类号： G01S5/30 ,  G01S7/292 ,  G01S7/52 ,  G01S7/527 ,  G01S11/14 ,  G01S13/18 ,  G01S15/18 ,  G01S15/87 ,  G01V1/36 ,  G01V1/38 ,  G01S15/00

CPC分类号： G01S7/52004 ,  G01S11/14 ,  G01S15/18 ,  G01S15/87 ,  G01S5/30 ,  G01S7/5273 ,  G01V1/364 ,  G01V1/3808 ,  G01S13/18 ,  G01S7/2927

摘要： Apparatus and methods for improving signal detection and tracking in underwater acoustic devices receiving a set of acoustic pulses propagated in response to repetitive synchronizing events. Each of the set of pulses is correlated with a replica of each pulse in a receiver in the underwater devices during an associated time window. The correlated output of the receiver is compared to an adjustable threshold characteristic in a detector for selection of the actual pulse according to predetermined criteria for each of the set of pulses. An actual time of reception relative to the synchronizing event is assigned to the selected pulse. Previous actual times of reception are used to estimate the expected time of reception of the associated pulse relative to the next synchronizing event. The estimate is used to adjust the associated time window to encompass the expected time of reception. Previous actual times of reception are compared to corresponding estimated times of reception to develop a measure of the quality of the estimates. The shape of the threshold characteristic and the width of the associated time window are adjusted as a function of the measure of the quality. A preferred threshold characteristic has a parabolic shape with its vertex defining a minimum threshold level at the expected time of reception. High quality measures lower the minimum threshold and narrow the parabola and the time window; low quality measures raise the minimum threshold level and broaden the parabola and the time window. Adaptive signal tracking is thereby provided.

摘要翻译： 用于改善水下声学装置中的信号检测和跟踪的装置和方法，其接收响应于重复的同步事件传播的一组声学脉冲。 脉冲集合中的每一个与相关时间窗口内的水下装置的接收器中的每个脉冲的副本相关。 将接收机的相关输出与检测器中的可调阈值特性进行比较，以根据脉冲组中的每一个的预定标准选择实际脉冲。 相对于同步事件的实际接收时间被分配给所选择的脉冲。 以前的实际接收时间用于估计相对于下一个同步事件的相关脉冲的预期接收时间。 该估计用于调整相关联的时间窗口以包含预期的接收时间。 将以前的实际接收时间与相应的预计接收时间进行比较，以制定估计质量的度量。 阈值特征的形状和相关时间窗口的宽度作为质量度量的函数进行调整。 优选的阈值特征具有抛物线形状，其顶点在预期的接收时间定义最小阈值水平。 高质量措施降低最低门槛，缩小抛物线和时间窗; 低质量措施提高了最低门槛值，拓宽了抛物线和时间窗。 从而提供自适应信号跟踪。