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：US06501941B1

公开(公告)日：2002-12-31

申请号：US09432440

申请日：1999-11-02

申请人： Donald C. D. Chang ,  Kar W. Yung ,  David C. Cheng ,  Urban A. Von Der Embse ,  John I. Novak, III ,  Frank A. Taormina ,  Ming U. Chang

发明人： Donald C. D. Chang ,  Kar W. Yung ,  David C. Cheng ,  Urban A. Von Der Embse ,  John I. Novak, III ,  Frank A. Taormina ,  Ming U. Chang

IPC分类号： H04B7185

CPC分类号： H04B7/18519 ,  B64G1/1007 ,  B64G1/242

摘要： Methods for increasing the efficiency of satellite constellation operations are disclosed. The steps of the present invention comprise calculating the maximum number of communications signals that each satellite in the satellite constellation can generate, determining an operational constraint on each satellite, the operational constraint limiting the number of communications signals that each satellite can radiate substantially simultaneously, determining an operational space for each satellite wherein the operational space is defined using the operational constraint and the calculated number of signals, and using the operational space for each satellite in the constellation to determine the operational point for the constellation.

摘要翻译： 公开了提高卫星星座操作效率的方法。 本发明的步骤包括计算卫星星座中每个卫星可以产生的通信信号的最大数量，确定每个卫星的操作约束，限制每个卫星可基本上同时辐射的通信信号的数量的操作约束，确定 每个卫星的操作空间，其中使用操作约束和所计算的信号数定义操作空间，并且使用星座中的每个卫星的操作空间来确定星座的操作点。

公开(公告)号：US06229477B1

公开(公告)日：2001-05-08

申请号：US09174182

申请日：1998-10-16

申请人： Donald C. D. Chang ,  Kar W. Yung ,  William J. Nunan ,  David C. Cheng ,  Bruce E. Shuman

发明人： Donald C. D. Chang ,  Kar W. Yung ,  William J. Nunan ,  David C. Cheng ,  Bruce E. Shuman

IPC分类号： H04B7185

CPC分类号： G01S5/14 ,  G01S5/12

摘要： A method and system for determining a position of an orbiting transceiver in a communications network includes at least a first and second transceiver at a first and second known location, respectively, on Earth. The first and second transceivers are adapted to transmit and receive communications signals to and from the orbiting transceiver. A processor coupled to one of the first and second transceivers determines a first and second range measurement between each of the first and second transceivers and the orbiting transceiver, respectively, as well as corresponding first and second range rates representative of a time rate of change of the first and second range measurements. The processor then determines a circle of intersection representative of the set of possible positions for the orbiting transceiver based on the first range measurement and the first range rate wherein the circle of intersection includes a specific orientation in space, a specific radius and a center in a specific, three-dimensional position relative to the known position of the first transceiver. An angular position of the orbiting transceiver is then determined along the circle of intersection based on the known position of the second transceiver and the second range measurement. Finally, the position of the orbiting transceiver is determined based on the circle of intersection and the angular position.

摘要翻译： 用于确定通信网络中的轨道收发器的位置的方法和系统包括分别位于地球上的第一和第二已知位置处的至少第一和第二收发器。 第一和第二收发器适于向和/或绕轨道收发信机发送和接收通信信号。 耦合到第一和第二收发器中的一个的处理器分别确定第一和第二收发器和绕动收发器中的每一个之间的第一和第二范围测量，以及相应的第一和第二范围速率，其代表时间变化率 第一和第二范围测量。 然后，处理器基于第一范围测量和第一范围速率来确定代表轨道收发信机的一组可能位置的交集圈，其中交集圈包括空间中的特定取向，特定半径和 相对于第一收发器的已知位置的特定的三维位置。 然后，基于第二收发器的已知位置和第二范围测量，沿着交叉圆圈确定轨道收发器的角度位置。 最后，轨道收发器的位置基于交点和角位置确定。

公开(公告)号：US07198230B2

公开(公告)日：2007-04-03

申请号：US08949988

申请日：1997-10-14

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

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

IPC分类号： B64G1/00

CPC分类号： H04B7/195

摘要： A method and system for maximizing satellite coverage at predetermined local times for a set of predetermined geographic location includes a processor operative to determine a period of rotation for each of the desired satellites in the satellite constellation. The processor also determines a time dependent coverage of the satellite constellation based on the period of rotation and the trajectory of each of the desired satellites. The trajectories of the desired satellites are tilted until the satellite constellation provides maximum coverage at the predetermined local times for the set of predetermined geographic locations. If a new satellite constellation is being designed, command signals are programmed into a computer of a launch vehicle containing the modified trajectory. If an existing satellite constellation is being modified, the ground station transmits command signals to the satellites for modifying the trajectory of the satellites in accordance with the tilted trajectory.

摘要翻译： 一种用于在预定地理位置的一组预定的本地时间内最大化卫星覆盖的方法和系统包括可操作地确定卫星星座中每个所需卫星的旋转周期的处理器。 处理器还基于旋转周期和每个所需卫星的轨迹来确定卫星星座的时间相关覆盖。 期望的卫星的轨迹倾斜，直到卫星星座为预定的地理位置集合在预定的本地时间提供最大的覆盖。 如果正在设计新的卫星星座，则将命令信号编程到包含修改的轨迹的运载火箭的计算机中。 如果现有的卫星星座正在被修改，则地面站根据倾斜的轨迹向卫星发送命令信号以修改卫星的轨迹。

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：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：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：US06504505B1

公开(公告)日：2003-01-07

申请号：US09702264

申请日：2000-10-30

申请人： Kar W. Yung

发明人： Kar W. Yung

IPC分类号： H01Q326

CPC分类号： H01Q3/26 ,  H01Q3/24

摘要： A phase control block for combining signals from a phased array antenna includes a phase shifter for generating a phase shifted signal; a phase switch connected to the phase shifter having a first state wherein the phase switch connects a first signal to a switched signal output and a second signal to the phase shifter; and a signal summing device connected to the phase shifter for generating an output that is a sum of the switched signal output and the phase shifted signal.

摘要翻译： 用于组合来自相控阵天线的信号的相位控制块包括用于产生相移信号的移相器; 连接到移相器的相位开关具有第一状态，其中相位开关将第一信号连接到开关信号输出，第二信号连接到移相器; 以及连接到移相器的信号求和装置，用于产生作为开关信号输出和相移信号之和的输出。

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.