公开(公告)号：US06327534B1

公开(公告)日：2001-12-04

申请号：US08723725

申请日：1996-09-30

申请人： Nadav Levanon ,  Edward B. Victor ,  Sridhar Vembu

发明人： Nadav Levanon ,  Edward B. Victor ,  Sridhar Vembu

IPC分类号： G06G778

CPC分类号： G01S5/12 ,  G01S2205/008

摘要： A system and method for unambiguously determining the position of a user terminal (for example, a mobile wireless telephone) in a low-Earth orbit satellite communications system. The system includes a user terminal, at least two satellites with known positions and known velocities, and a gateway (that is, a terrestrial base station) for communicating with the user terminal through the satellites. The method includes the steps of determining a range parameter, a range difference parameter, and either or both of a range-rate parameter and a range-rate difference parameter. A range parameter represents a distance between one of the satellites and the user terminal. A range difference parameter represents the difference between (1) the distance between a first one of the satellites and the user terminal and (2) the distance between a second one of the satellites and the user terminal. A range-rate parameter represents a relative radial velocity between one of the satellites and the user terminal. A range-rate difference parameter represents the difference between (a) a relative radial velocity between a first one of the satellites and the user terminal and (b) a relative radial velocity between a second one of the satellites and the user terminal. The position of the user terminal on the Earth's surface is then determined based on the known positions and known velocities of the satellites, the range parameter, the range difference parameter, and either or both of the range-rate parameter and the range-rate difference parameter.

摘要翻译： 一种用于明确地确定低地球轨道卫星通信系统中的用户终端（例如，移动无线电话）的位置的系统和方法。 该系统包括用户终端，具有已知位置和已知速度的至少两个卫星，以及用于通过卫星与用户终端进行通信的网关（即，地面基站）。 该方法包括确定范围参数，范围差参数以及范围速率参数和范围速率差参数中的一个或两个的步骤。 范围参数表示其中一个卫星与用户终端之间的距离。 范围差参数表示（1）第一卫星与用户终端之间的距离与（2）第二卫星与用户终端之间的距离之间的差。 距离率参数表示卫星之一和用户终端之间的相对径向速度。 距离率差参数表示（a）第一卫星与用户终端之间的相对径向速度和（b）第二卫星与用户终端之间的相对径向速度之间的差。 然后根据卫星的已知位置和已知速度，范围参数，距离差参数以及范围速率参数和距离率差异中的任一个或两者来确定用户终端在地球表面上的位置 参数。

公开(公告)号：US5920284A

公开(公告)日：1999-07-06

申请号：US723723

申请日：1996-09-30

申请人： Edward B. Victor

发明人： Edward B. Victor

IPC分类号： G01S5/12 ,  G01S1/04 ,  G01S5/00 ,  G01S5/02 ,  G01S19/25 ,  H04B7/195 ,  H04Q7/34 ,  H04B7/185

CPC分类号： G01S5/02 ,  G01S1/04 ,  G01S5/0036

摘要： A system and method for resolving ambiguity in an ambiguous position solution for a user terminal position in a satellite communications system which includes a user terminal, at least one satellite, and a gateway communicating with the user terminal through the satellite. Each satellite has a plurality of satellite beams which each illuminate a region on the Earth in a known pattern relative to a satellite sub-track. A satellite beam illuminating the user terminal is identified along with its corresponding position relative to the sub-track. The orientations of possible user terminal positions and the identified beam relative to the satellite sub-track are compared to each other. Possible user terminal positions falling on an incorrect side of the sub-track from the detected beam illuminating the user terminal, are considered as incorrect solutions for that user terminal. The ambiguity solution can be determined using satellite identification and comparison elements in the user terminal, or at the gateway, in which case certain beam information is reported to the gateway. In further aspects of the invention, the beam being identified can be either a forward link or reverse link beam, or both, and each link has a different beam pattern.

摘要翻译： 一种用于解决包含用户终端，至少一个卫星和通过卫星与用户终端通信的网关的卫星通信系统中的用户终端位置的模糊位置解的歧义的系统和方法。 每个卫星具有多个卫星光束，每个卫星光束以相对于卫星子轨道的已知模式照射地球上的区域。 识别照射用户终端的卫星光束及其相对于子轨道的对应位置。 将可能的用户终端位置和所识别的波束相对于卫星子轨道的取向相互比较。 从检测到的光束照射用户终端的子轨道的不正确侧的可能的用户终端位置被认为是该用户终端的不正确的解决方案。 可以使用用户终端中的卫星识别和比较元素或网关来确定模糊度解决方案，在这种情况下，某些波束信息被报告给网关。 在本发明的另外的方面，被识别的波束可以是前向链路或反向链路波束，也可以是两者，并且每个链路具有不同的波束图案。

公开(公告)号：US07092725B2

公开(公告)日：2006-08-15

申请号：US10278502

申请日：2002-10-22

申请人： Jon J. Anderson ,  Jin Dai ,  Francis M. Ngai ,  Edward B. Victor

发明人： Jon J. Anderson ,  Jin Dai ,  Francis M. Ngai ,  Edward B. Victor

IPC分类号： H04Q7/20

CPC分类号： H04B7/1855

摘要： A system and method for determining timing offset errors in a low earth orbit satellite system based upon Doppler and Doppler rate of change is provided. A user terminal determines first and second timing offsets respectively associated with first and second satellite beams from respective first and second satellites. Next, the user terminal determines the Doppler and Doppler rate of change associated with the first and second satellite beams. A timing offset is estimated from the measured Doppler and Doppler rate of change and is then compared with the user terminal's own determined timing offset. If the comparison does not produce a value within a predetermined threshold, a beam identification error is declared.

公开(公告)号：US07260411B2

公开(公告)日：2007-08-21

申请号：US11297557

申请日：2005-12-07

申请人： Jon J. Anderson ,  Jin Dai ,  Francis M. Ngai ,  Edward B. Victor

发明人： Jon J. Anderson ,  Jin Dai ,  Francis M. Ngai ,  Edward B. Victor

IPC分类号： H04Q7/20

CPC分类号： H04B7/1855

摘要： A system and method for determining timing offset errors in a low earth orbit satellite system based upon Doppler and Doppler rate of change is provided. A user terminal determines first and second timing offsets respectively associated with first and second satellite beams from respective first and second satellites. Next, the user terminal determines the Doppler and Doppler rate of change associated with the first and second satellite beams. A timing offset is estimated from the measured Doppler and Doppler rate of change and is then compared with the user terminal's own determined timing offset. If the comparison does not produce a value within a predetermined threshold, a beam identification error is declared.

摘要翻译： 提供了一种用于基于多普勒和多普勒频率来确定低地球轨道卫星系统中的定时偏移误差的系统和方法。 用户终端确定分别与来自相应的第一和第二卫星的第一和第二卫星波束相关联的第一和第二定时偏移。 接下来，用户终端确定与第一和第二卫星波束相关联的多普勒和多普勒频率变化。 根据测量的多普勒和多普勒频率估计定时偏移，然后将其与用户终端自己确定的定时偏移进行比较。 如果比较不产生预定阈值内的值，则声明波束识别误差。