公开(公告)号：US06845085B1

公开(公告)日：2005-01-18

申请号：US09408965

申请日：1999-09-29

Applicant: David A. Wright ,  Stuart T. Linsky ,  Gregory S. Caso ,  Reginald Jue

Inventor： David A. Wright ,  Stuart T. Linsky ,  Gregory S. Caso ,  Reginald Jue

IPC: H04L27/20 ,  H04B7/185 ,  H04B7/212 ,  H04J3/00 ,  H04L7/00 ,  H04L27/36 ,  H04J3/06

CPC classification number: H04B7/18513

Abstract: The present invention provides a highly accurate synchronization method for a satellite communication system (100). The system maintains a downlink symbol counter at an earth terminal and determines a downlink symbol count representative of the time of arrival of a burst transmitted from the earth terminal to a satellite (106, 206). The earth terminal adjusts the downlink symbol counter to correspond to the downlink symbol count (136, 220) upon arrival of a predetermined reference point in a downlink frame. A timing error may initially be determined by launching an entry order wire from the earth terminal to the satellite (116). The timing error may be transmitted to the earth terminal using a correction code which indicates the transmission is early, late, absent, or no change is required (134, 218). The terminal may make additional periodic timing adjustments based on the length of the propagation path between the earth terminal and the satellite (108, 208). The earth terminal may then precisely time the transmission of bursts from the earth terminal to the satellite (130, 214). The length of the propagation path and the timing error may be stored in the earth terminal so that the earth terminal may reenter the system without undertaking multiple commissioning processes.

Abstract translation: 本发明提供了一种用于卫星通信系统（100）的高精度同步方法。 该系统在接地终端维护下行链路符号计数器，并确定表示从地球终端向卫星（106,206）发送的脉冲串的到达时间的下行链路符号计数。 接地终端在下行链路帧中预定参考点到达时，调整下行链路符号计数器以对应于下行链路符号计数（136,220）。 最初可以通过从地球终端向卫星（116）发射入口命令线来确定定时错误。 定时误差可以使用指示传输是早，晚，不存在或不需要改变的校正码（134,218）来发送到接地终端。 终端可以基于接地终端和卫星（108,208）之间的传播路径的长度来进行附加的周期性定时调整。 然后，接地终端可以精确地将从地球终端到突发的传输时间延时到卫星（130,214）。 传播路径的长度和定时误差可以存储在接地端子中，使得接地端子可以重新进入系统而不进行多次调试过程。

公开(公告)号：US06697344B1

公开(公告)日：2004-02-24

申请号：US09270167

申请日：1999-03-16

Applicant: Dominic P. Carrozza ,  Gregory S. Caso ,  Vincent C. Moretti ,  Reginald Jue ,  David A. Wright

Inventor： Dominic P. Carrozza ,  Gregory S. Caso ,  Vincent C. Moretti ,  Reginald Jue ,  David A. Wright

IPC: H04B7185

CPC classification number: H04B7/1858

Abstract: An initial entry processor (40) for use in a processing satellite (12) in a satellite based communications system (10) is provided having a buffer (62), a detection and timing circuit (64) and an identity circuit (66). The buffer (62) stores an initial entry burst (54) transmitted from at least one terrestrial terminal (14) to the processing satellite (12). The detection and timing circuit (64) detects the initial entry burst (54) and determines a time of arrival of the initial entry burst (54) relative to an initial entry burst slot (52). The identity circuit (66) determines an identity of the terrestrial terminal (14) that transmitted the initial entry burst (54) such that the time of arrival is used by the identified terrestrial terminal (14) during subsequent communications with the processing satellite (12).

Abstract translation: 提供了一种用于基于卫星的通信系统（10）中的处理卫星（12）中的初始入口处理器（40），其具有缓冲器（62），检测和定时电路（64）以及标识电路（66）。 缓冲器（62）存储从至少一个地面终端（14）发送到处理卫星（12）的初始入口突发（54）。 检测和定时电路（64）检测初始入口突发（54）并且确定初始入口突发（54）相对于初始入口突发时隙（52）的到达时间。 身份电路（66）确定发射初始入口突发（54）的地面终端（14）的身份，使得在与处理卫星（12）的后续通信期间由所识别的地面终端（14）使用到达时间 ）。