公开(公告)号：US06990314B1

公开(公告)日：2006-01-24

申请号：US09576652

申请日：2000-05-22

申请人： Frank A. Hagen ,  Richard Flammang ,  Kar W. Yung ,  Donald C. D. Chang

发明人： Frank A. Hagen ,  Richard Flammang ,  Kar W. Yung ,  Donald C. D. Chang

IPC分类号： H04B7/19

CPC分类号： H04B7/18534

摘要： A wireless communication system includes a satellite constellation consisting of a plurality of satellites. Each of the plurality of satellites is in an orbit whose eccentricity and inclination are perturbed relative to the same geosynchronous orbit. Each of the satellites in the constellation is capable of relaying signals in either direction between a central ground hub and a plurality of mobile user terminals. The plurality of satellites are configured such that the period of their geosynchronous orbit remains substantially constant at one sidereal day.

摘要翻译： 无线通信系统包括由多个卫星组成的卫星星座。 多个卫星中的每一个都在相对于相同的地球同步轨道扰动其偏心和倾斜的轨道中。 星座中的每颗卫星能够在中央地面集线器和多个移动用户终端之间的任一方向上中继信号。 多个卫星被配置为使得它们的地球同步轨道的周期在一个恒星天数保持基本恒定。

公开(公告)号：US07215954B1

公开(公告)日：2007-05-08

申请号：US09587960

申请日：2000-06-06

申请人： Kar W. Yung ,  Frank A. Hagen ,  Donald C. D. Chang

发明人： Kar W. Yung ,  Frank A. Hagen ,  Donald C. D. Chang

IPC分类号： H04Q7/20

CPC分类号： H04B7/18539

摘要： A mobile wireless communications system including a plurality of individual transponding nodes of various types, all in communication with a central processing hub. A local user signal is processed by the central processing hub and radiated through multiple paths to a plurality of the plurality of individual transponding platforms simultaneously. The signal is then re-radiated by each of the plurality of the plurality of individual transponding platforms to a mobile terminal that receives the re-radiated signal from the plurality of the plurality of individual transponding platforms coherently and in phase. The number of transponders and codes used to transmit each user signal can be readily adapted to user requirements. Additionally, each user is assigned a profit value by the central processing hub depending upon certain user characteristics. The assigned user profit value allows the total system utility/profitability to be maximized.

摘要翻译： 一种移动无线通信系统，包括多个各种类型的单个转发节点，全部与中央处理集线器通信。 本地用户信号由中央处理集线器处理，并通过多个路径同时辐射到多个单独的转发平台。 然后，信号被多个多个单独的转发平台中的每一个重新辐射到移动终端，该移动终端相干地并且相位地从多个多个单独的转发平台接收再发射的信号。 用于发送每个用户信号的转发器和代码的数量可以容易地适应用户需求。 此外，根据某些用户特征，每个用户被中央处理集线器分配利润值。 分配的用户利润值允许最大化整个系统效用/盈利能力。

公开(公告)号：US06909875B1

公开(公告)日：2005-06-21

申请号：US09576648

申请日：2000-05-22

申请人： Kar W. Yung ,  Frank A. Hagen ,  Donald C. D. Chang

发明人： Kar W. Yung ,  Frank A. Hagen ,  Donald C. D. Chang

IPC分类号： H01Q3/26 ,  H04B7/185 ,  H04B7/212 ,  H04B7/26

CPC分类号： H04B7/18504 ,  H04B7/18506 ,  H04B7/18532 ,  H04B7/18534 ,  H04B7/212

摘要： A mobile wireless communications system including a plurality of individual transponding nodes of various types, all in communication with a central processing hub. A local user signal is processed by the central processing hub and radiated through multiple paths to a plurality of the plurality of individual transponding platforms simultaneously. The signal is then re-radiated by each of the plurality of the plurality of individual transponding platforms to a mobile terminal that receives the re-radiated signal from the plurality of the plurality of individual transponding platforms coherently and in phase. The number of transponders and codes used to transmit each user signal can be readily adapted to user requirements.

摘要翻译： 一种移动无线通信系统，包括多个各种类型的单个转发节点，全部与中央处理集线器通信。 本地用户信号由中央处理集线器处理，并通过多个路径同时辐射到多个单独的转发平台。 然后，信号被多个多个单独的转发平台中的每一个重新辐射到移动终端，该移动终端相干地并且相位地从多个多个单独的转发平台接收再发射的信号。 用于发送每个用户信号的转发器和代码的数量可以容易地适应用户需求。

公开(公告)号：US06785553B2

公开(公告)日：2004-08-31

申请号：US09841110

申请日：2001-04-24

申请人： Donald C. D. Chang ,  Kar W. Yung ,  David C. Cheng ,  Ming U. Chang ,  Frank A. Hagen

发明人： Donald C. D. Chang ,  Kar W. Yung ,  David C. Cheng ,  Ming U. Chang ,  Frank A. Hagen

IPC分类号： H04Q720

CPC分类号： G01S19/40 ,  G01S5/14 ,  G01S19/07 ,  G01S19/15 ,  H04B7/18504 ,  H04B7/18532 ,  H04B7/18534

摘要： A method and system for using two-way ranging navigation to accurately determine the location of a transponder platform above-Earth or a fixed or mobile target on the ground or on water. The two-way ranging navigation measurements are used as calibration references, thereby improving the positioning accuracy of GPS. The system includes GPS and a two-way ranging navigation system for taking position measurements of a target. A correction factor is determined as a function of the measurements and the GPS position is adjusted by the correction factor. The method for calibrating GPS using two-way ranging navigation involves taking a two-way ranging navigation measurement and a GPS measurement of a target, determining a correction factor as a function of the measurements, and correcting the GPS position by taking a second GPS measurement and adjusting it by the correction factor.

摘要翻译： 一种使用双向测距导航准确地确定地球上的应答器平台或地面或水上固定或移动目标的位置的方法和系统。 双向测距导航测量用作校准参考，从而提高GPS的定位精度。 该系统包括GPS和用于对目标进行位置测量的双向测距导航系统。 作为测量的函数确定校正因子，并且通过校正因子来调整GPS位置。 使用双向测距导航来校准GPS的方法包括进行目标的双向测距导航测量和GPS测量，确定作为测量的函数的校正因子，以及通过进行第二GPS测量来校正GPS位置 并通过校正因子进行调整。

公开(公告)号：US5142291A

公开(公告)日：1992-08-25

申请号：US563129

申请日：1990-08-03

申请人： Donald C. D. Chang ,  Joseph G. Gurley ,  Frank A. Hagen ,  Samuel C. Reynolds ,  Kar W. Yung

发明人： Donald C. D. Chang ,  Joseph G. Gurley ,  Frank A. Hagen ,  Samuel C. Reynolds ,  Kar W. Yung

IPC分类号： G01K11/00

CPC分类号： G01K11/006

摘要： A technique for near-field tomographic imaging using a multiple-receiver correlating interferometer. A target object or scene to be imaged is located in a near-field or Fresnel region of a receiver system. The target object radiates or reflects a signal that is sensed by a plurality of antennas. The received signals are correlated using conventional correlation algorithms. An image pixel for a focal point is then computed by correcting a differential time delay between a signal emitted at the focal point and received at first and second antennas. The system is focused on the target object by correcting a phase term of the correlation algorithms. The phase term is corrected by multiplying the correlation algorithms by a phase factor. A peak correlated value is developed when the focal point is at the target object location. A series of snapshots is generated from data produced by the focussing process, as the focal point is moved through the scene. The snapshots are successively superimposed, using tomographic techniques, to form a high resolution image map. The system achieves extremely high resolutions, rivalling those of synthetic aperture radar.

公开(公告)号：US07089000B1

公开(公告)日：2006-08-08

申请号：US09584012

申请日：2000-05-30

申请人： Ming U. Chang ,  Kar W. Yung ,  Frank A. Hagen ,  Donald C. D. Chang

发明人： Ming U. Chang ,  Kar W. Yung ,  Frank A. Hagen ,  Donald C. D. Chang

IPC分类号： H04Q7/20

CPC分类号： H04B7/18534

摘要： A mobile wireless communications system including a plurality of individual transponding platforms all in communication with a central processing hub. A signal processed by the central processing hub is radiated simultaneously through multiple paths to a plurality of the individual transponding platforms. The signal transmitted to each transponding platform by the hub is appropriately delayed by the hub so as to equalize the differential delay of all such signals from a given receiver location. The radiated signal is then re-radiated by each of the plurality of individual transponding platforms to a mobile satellite terminal that receives the re-radiated signal from the plurality of individual transponding platforms. The signals from the plurality of transponding platforms are all received coherently by the intended user, and incoherently by all other users.

摘要翻译： 一种移动无线通信系统，包括与中央处理集线器通信的多个单独的转发平台。 由中央处理集线器处理的信号同时通过多个路径被辐射到多个单独的转发平台。 由集线器传输到每个转发平台的信号由集线器适当地延迟，以便均衡来自给定接收机位置的所有这些信号的差分延迟。 然后，辐射信号被多个单独的转发平台中的每一个重新辐射到从多个单独的转发平台接收再发射信号的移动卫星终端。 来自多个转发平台的信号都被预期用户相干接收，并且被所有其他用户不连贯地接收。

公开(公告)号：US06388615B1

公开(公告)日：2002-05-14

申请号：US09587758

申请日：2000-06-06

申请人： Donald C. D. Chang ,  Ying Feria ,  Weizheng Wang ,  Alan Cha ,  Ming Chang ,  Frank A. Hagen ,  Kar W. Yung

发明人： Donald C. D. Chang ,  Ying Feria ,  Weizheng Wang ,  Alan Cha ,  Ming Chang ,  Frank A. Hagen ,  Kar W. Yung

IPC分类号： H01Q322

CPC分类号： H04B7/18504 ,  H04B7/0617 ,  H04B7/086

摘要： A system and method for tracking a user. The system is adapted for use in a wireless communication system and creates a plurality of beams within a coverage area. A first beam is directed at a user in a first microcell and a number of additional beams illuminate microcells immediately adjacent the first microcell. The system is equipped with a mechanism for detecting movement of the user from the first microcell to one of the immediately adjacent microcells. On the detection of movement of the user, the system redirects the first beam from the first microcell to a second microcell, the second microcell being one of the adjacent microcells. In the illustrative embodiment, the system is implemented in a stratospheric platform based communication system including a hub adapted to communicate with a stratospheric platform. A transceiver and a phased array antenna are disposed on the platform to communicate with the hub and with the user. A second antenna is provided on the platform to communicate with the hub. Beamforming and direction are implemented on the hub and communicated to the platform. The user's position is detected with a global positioning system receiver, by measuring the strength of a signal received from the user, or by other suitable means. On detection of user movement from the first microcell, the beamforming system redirects the beam to follow the user into a second microcell. Additional beams around the user's microcell are illuminated to facilitate detection of the users movement.

公开(公告)号：US08223733B2

公开(公告)日：2012-07-17

申请号：US11049499

申请日：2005-02-02

申请人： Kar W. Yung ,  Frank A. Hagen ,  Donald C. D. Chang

发明人： Kar W. Yung ,  Frank A. Hagen ,  Donald C. D. Chang

IPC分类号： H04B7/216

CPC分类号： H04B7/18504 ,  H04B7/18506 ,  H04B7/18532 ,  H04B7/18534 ,  H04B7/212

摘要： A mobile wireless communications system including a plurality of individual transponding nodes of various types, all in communication with a central processing hub. A local user signal is processed by the central processing hub and radiated through multiple paths to a plurality of the plurality of individual transponding platforms simultaneously. The signal is then re-radiated by each of the plurality of the plurality of individual transponding platforms to a mobile terminal that receives the re-radiated signal from the plurality of the plurality of individual transponding platforms coherently and in phase. The number of transponders and codes used to transmit each user signal can be readily adapted to user requirements.

摘要翻译： 一种移动无线通信系统，包括多个各种类型的单个转发节点，全部与中央处理集线器通信。 本地用户信号由中央处理集线器处理，并通过多个路径同时辐射到多个单独的转发平台。 然后，信号被多个多个单独的转发平台中的每一个重新辐射到移动终端，该移动终端相干地并且相位地从多个多个单独的转发平台接收再发射的信号。 用于发送每个用户信号的转发器和代码的数量可以容易地适应用户需求。

公开(公告)号：US06963548B1

公开(公告)日：2005-11-08

申请号：US09550505

申请日：2000-04-17

申请人： Donald C. D. Chang ,  Kar W. Yung ,  David C. Cheng ,  Frank A. Hagen ,  Ming U. Chang ,  John I. Novak, III

发明人： Donald C. D. Chang ,  Kar W. Yung ,  David C. Cheng ,  Frank A. Hagen ,  Ming U. Chang ,  John I. Novak, III

IPC分类号： H04B1/7097 ,  H04B7/185 ,  H04B7/26 ,  H04B1/707

CPC分类号： H04B7/18534 ,  H04B1/7097 ,  H04B2201/709709

摘要： A novel method and apparatus is described for reducing the number of CDMA codes for a constellation of multiple trasponder platforms serving a number of subscribers in the same service area. A coherent processing technique synchronizes the phase of CDMA signals arriving at a subscriber from multiple trasponder platforms to increase the code capacity and thus the number of possible subscribers for most of the multiple transponder platform systems in current use.

摘要翻译： 描述了一种新颖的方法和装置，用于减少为同一服务区域中的多个订户服务的多个应答器平台的星座的CDMA码的数量。 相干处理技术使来自多个应答器平台的到达用户的CDMA信号的相位同步，以增加当前使用中的多个应答器平台系统中的大多数应答器平台系统的代码容量和可能的订户数量。

公开(公告)号：US06914557B2

公开(公告)日：2005-07-05

申请号：US09947422

申请日：2001-09-05

申请人： Donald C. D. Chang ,  Ying Feria ,  Weizheng Wang ,  Alan G. Cha ,  Ming U. Chang ,  Frank A. Hagen ,  Kar W. Yung

发明人： Donald C. D. Chang ,  Ying Feria ,  Weizheng Wang ,  Alan G. Cha ,  Ming U. Chang ,  Frank A. Hagen ,  Kar W. Yung

IPC分类号： H04B7/06 ,  H04B7/08 ,  H04B7/185

CPC分类号： H04B7/18504 ,  H04B7/0617 ,  H04B7/086

摘要： A system and method for tracking a user. The system is adapted for use in a wireless communication system and creates a plurality of beams within a coverage area. A first beam is directed at a user in a first microcell and a number of additional beams illuminate microcells immediately adjacent the first microcell. The system is equipped with a mechanism for detecting movement of the user from the first microcell to one of the immediately adjacent microcells. On the detection of movement of the user, the system redirects the first beam from the first microcell to a second microcell, the second microcell being one of the adjacent microcells. In the illustrative embodiment, the system is implemented in a stratospheric platform based communication system including a hub adapted to communicate with a stratospheric platform. A transceiver and a phased array antenna are disposed on the platform to communicate with the hub and with the user. A second antenna is provided on the platform to communicate with the hub. Beamforming and direction are implemented on the hub and communicated to the platform. The user's position is detected with a global positioning system receiver, by measuring the strength of a signal received from the user, or by other suitable means. On detection of user movement from the first microcell, the beamforming system redirects the beam to follow the user into a second microcell. Additional beams around the user's microcell are illuminated to facilitate detection of the users movement.

摘要翻译： 用于跟踪用户的系统和方法。 该系统适用于无线通信系统，并在覆盖区域内创建多个波束。 第一光束被引导到第一微小区中的用户，并且多个附加光束照亮紧邻第一微小区的微小区。 该系统配备有用于检测用户从第一微小区到紧邻的微小区之一的移动的机制。 在检测用户的移动时，系统将第一光束从第一微小区重定向到第二微小区，第二微小区是相邻微小区之一。 在说明性实施例中，该系统在基于平流层平台的通信系统中实现，其包括适于与平流层平台通信的集线器。 收发器和相控阵天线设置在平台上以与集线器和用户通信。 在平台上提供第二天线以与集线器通信。 波束形成和方向在集线器上实现并传达到平台。 通过测量从用户接收的信号的强度，或通过其他合适的方式，用全球定位系统接收机检测用户的位置。 在检测到来自第一微小区的用户移动时，波束成形系统重定向波束以跟随用户进入第二微小区。 用户微单元周围的附加光束被照亮以便于检测用户的移动。