公开(公告)号：US06965753B1

公开(公告)日：2005-11-15

申请号：US09651820

申请日：2000-08-30

申请人： David S. Miller ,  Jeffrey A. Lorbeck

发明人： David S. Miller ,  Jeffrey A. Lorbeck

IPC分类号： H04B7/01 ,  H04B7/208 ,  H04B7/185

CPC分类号： H04B7/208 ,  H04B7/01 ,  Y10S367/904

摘要： Apparatus for Doppler correction in a wireless communications system, including a first frequency synthesizer for generating a carrier signal oscillating at a rate responsive to a first input, a counter coupled to the first input for generating a Doppler compensation signal, the counter having a clock input, and a second frequency synthesizer coupled to the clock input for generating a clock signal oscillating at a rate responsive to a rate input. The rate input is adjusted over time according to a predetermined sequence so that the Doppler compensation signal compensates for the Doppler effect experienced by, for example, ground-to-satellite communications in a satellite communications system.

摘要翻译： 一种用于无线通信系统中的多普勒校正装置，包括用于产生响应于第一输入的速率振荡的载波信号的第一频率合成器，耦合到第一输入的计数器，用于产生多普勒补偿信号，该计数器具有时钟输入 以及耦合到时钟输入的第二频率合成器，用于产生响应于速率输入的速率振荡的时钟信号。 速率输入根据预定的顺序随时间被调整，使得多普勒补偿信号补偿由卫星通信系统中的例如地对卫通信所经历的多普勒效应。

公开(公告)号：US06181912B2

公开(公告)日：2001-01-30

申请号：US09150499

申请日：1998-09-09

申请人： David S. Miller ,  Jeffrey A. Lorbeck

发明人： David S. Miller ,  Jeffrey A. Lorbeck

IPC分类号： H04B7185

CPC分类号： H04B7/2125

摘要： A method and apparatus useful for determining the accumulated error in a user terminal dock in a satellite communications system. The satellite communications system includes a gateway, a satellite with a known position and known velocity, and a user terminal having a deskew buffer clocked by a user terminal clock. The method includes the steps of computing the one-way signal delay between the satellite and the user terminal, computing a desired deskew buffer delay based on the computed one-way signal delay and a predetermined maximum value of said one-way signal delay, and computing the accumulated error in the user terminal clock based on the desired deskew buffer delay and the actual deskew buffer delay.

摘要翻译： 一种用于确定卫星通信系统中的用户终端站中的累积误差的方法和装置。 卫星通信系统包括网关，具有已知位置和已知速度的卫星，以及具有由用户终端时钟计时的偏移缓冲器的用户终端。 该方法包括以下步骤：计算卫星与用户终端之间的单向信号延迟，基于所计算的单向信号延迟和所述单向信号延迟的预定最大值计算所需的偏移缓冲器延迟;以及 基于所需的偏移缓冲延迟和实际的偏移缓冲区延迟来计算用户终端时钟中的累积误差。