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91. 发明授权

US06725013B1 Communication system having frequency reuse in non-blocking manner 有权
标题翻译：具有无阻塞方式的频率复用的通信系统
公开(公告)号：US06725013B1
公开(公告)日：2004-04-20
申请号：US09594375
申请日：2000-06-15
申请人： Donald C. D. Chang , Weizheng Wang , Ying Feria , Ming U. Chang , Harold A. Rosen , Wah L. Lim
发明人： Donald C. D. Chang , Weizheng Wang , Ying Feria , Ming U. Chang , Harold A. Rosen , Wah L. Lim
IPC分类号： H04B7185
CPC分类号： H04B7/18508
摘要： A communications system (10) and method of operating the communications system includes a high altitude communication device (12) that communicates with a plurality of user terminals and a gateway station (30). The gateway station (30) couples the users to terrestrial networks (32) and other users. The high altitude communication device (16) has a controller that generates a second beam having the first frequency to a service (26). The stratospheric platform (12) does not generate the second beam within a blocking area. User terminals within the service area outside the blocking area are configured to receive the first beam and the second beam.
摘要翻译：通信系统（10）和操作通信系统的方法包括与多个用户终端和网关站（30）通信的高空通信设备（12）。网关站（30）将用户耦合到地面网络（32）和其他用户。高空通信设备（16）具有控制器，该控制器产生具有第一频率的服务（26）的第二波束。平流层平台（12）不会在阻挡区域内产生第二束。阻挡区域外的服务区域内的用户终端被配置为接收第一光束和第二光束。

92. 发明授权

US06567052B1 Stratospheric platform system architecture with adjustment of antenna boresight angles 有权
标题翻译：平流层平台系统架构，调整天线视轴角度
公开(公告)号：US06567052B1
公开(公告)日：2003-05-20
申请号：US09718973
申请日：2000-11-21
申请人： Weizheng Wang , Donald C. D. Chang , Ming Chang , Ying Feria
发明人： Weizheng Wang , Donald C. D. Chang , Ming Chang , Ying Feria
IPC分类号： H01Q300
CPC分类号： H01Q1/28 , H01Q3/02
摘要： A stratospheric platform communication system (10) having antenna boresight angles (EL, AZ) that can be adjusted by an adjustable payload antenna (40) according to the requirements of a specific application. The present invention provides an efficient use of available resources by allowing platform systems (10) and GEO satellite systems to share the radio frequency spectrum without interference, and improves the coverage area provided by a stratospheric platform system by allocating stratospheric platforms (12) to specific coverage areas in combination thereby increasing coverage capacity in high traffic areas.
摘要翻译：具有可根据特定应用的要求由可调节有效载荷天线（40）调节的具有天线视轴角（EL，AZ）的平流层平台通信系统（10）。本发明通过允许平台系统（10）和GEO卫星系统在没有干扰的情况下共享无线电频谱来提供可用资源的有效使用，并且通过将平流层平台（12）分配给特定的平流层平台系统来提高由平流层平台系统提供的覆盖区域覆盖区域相结合，从而提高高交通区域的覆盖能力。

93. 发明授权

US06563457B2 Method and system for determining a position of an object using two-way ranging in a polystatic satellite configuration 有权
公开(公告)号：US06563457B2
公开(公告)日：2003-05-13
申请号：US10001501
申请日：2001-11-14
申请人： Donald C. D. Chang , Kar W. Yung , John I. Novak, III , Robert R. Holden
发明人： Donald C. D. Chang , Kar W. Yung , John I. Novak, III , Robert R. Holden
IPC分类号： G01S124
CPC分类号： G01S19/46 , G01S5/0054 , G01S5/14 , G01S13/003 , G01S13/878 , G01S19/03 , G01S19/09 , G01S19/15 , G01S19/49
摘要： A method and system for determining a position of an object utilizes two-way ranging and polystatic techniques. A first communication transceiver at a first known location provides a bidirectional communication path between the first communication transceiver and the object wherein the first communication transceiver transmits a first ranging signal to the object and the object transmits a second ranging signal to the first communication transceiver in response to the first ranging signal. The first communication transceiver further provides a first unidirectional communication path between the first communication transceiver and the object wherein the first communication transceiver performs one of transmitting a third ranging signal to the object and receiving a fourth ranging signal from the object. A second communication transceiver at a second known location provides a second unidirectional communication path between the second communication transceiver and the object wherein the second communication transceiver performs one of transmitting a third ranging signal to the object and receiving a fourth ranging signal from the object. A signal processor determines a first path length corresponding to a first time length of the bidirectional communication path, a second path length corresponding to a second time length of the first and second unidirectional communication paths, and the position of the object based on the first and second known locations and the first and second path lengths.

94. 发明授权

US06507314B2 Ground-based, wavefront-projection beamformer for a stratospheric communications platform 有权
公开(公告)号：US06507314B2
公开(公告)日：2003-01-14
申请号：US10096765
申请日：2002-03-13
申请人： Donald C. D. Chang , Kar Yung , Frank A. Hagen , Weizheng Wang
发明人： Donald C. D. Chang , Kar Yung , Frank A. Hagen , Weizheng Wang
IPC分类号： H01Q322
CPC分类号： H01Q3/26 , H01Q3/30 , H01Q25/00
摘要： A method for beamforming signals for an array of receiving or transmitting elements includes the steps of selecting a beam elevation and azimuth and grouping elements of an antenna array into element ensembles that are substantially aligned with a wavefront projection on the antenna array corresponding to the selected beam elevation and azimuth.

95. 发明授权

US06496146B1 Modular mobile terminal for satellite communication 有权
标题翻译：卫星通信模块化移动终端
公开(公告)号：US06496146B1
公开(公告)日：2002-12-17
申请号：US09376942
申请日：1999-08-18
申请人： Donald C. D. Chang , Urban A. von der Embse , Kar W. Yung , John I. Novak, III
发明人： Donald C. D. Chang , Urban A. von der Embse , Kar W. Yung , John I. Novak, III
IPC分类号： H01Q124
CPC分类号： H01Q1/38 , H01Q1/242 , H01Q1/246 , H01Q1/3275 , H01Q1/42 , H01Q9/0407 , H01Q21/065 , H01Q23/00
摘要： A modular mobile terminal for a satellite system is disclosed in which the satellite system has a ground station and a network such as a telephone network coupled to the ground station. Each of the mobile terminals has a radome layer and a support layer having a plurality of circuit traces formed thereon. An element module is coupled between the support layer and the radome layer. Each element module comprises a housing and a radiating patch having a feed therethrough. A dielectric layer is coupled adjacent to the radiating patch. A ground plane is disposed adjacent to the dielectric layer on the opposite side of the dielectric layer as the radiating patch. A plurality of circuit chips is coupled to the ground plane. The support layer of the array has a plurality of circuit traces formed thereon. A plurality of interconnections between the circuit chips and the plurality of traces connect the traces and the circuit chips.
摘要翻译：公开了一种用于卫星系统的模块化移动终端，其中卫星系统具有地面站和诸如耦合到地面站的电话网络的网络。每个移动终端具有天线罩层和在其上形成有多个电路迹线的支撑层。元件模块耦合在支撑层和天线罩层之间。每个元件模块包括外壳和具有穿过其中的馈电的辐射贴片。电介质层与辐射贴片相邻耦合。接地平面设置在与作为辐射贴片的电介质层相反侧的电介质层附近。多个电路芯片耦合到接地层。阵列的支撑层具有形成在其上的多个电路迹线。电路芯片和多个迹线之间的多个互连连接迹线和电路芯片。

96. 发明授权

US06380893B1 Ground-based, wavefront-projection beamformer for a stratospheric communications platform 有权
标题翻译：用于平流层通信平台的地面波前投影波束形成器
公开(公告)号：US06380893B1
公开(公告)日：2002-04-30
申请号：US09655041
申请日：2000-09-05
申请人： Donald C. D. Chang , Kar Yung , Frank A. Hagen , Weizheng Wang
发明人： Donald C. D. Chang , Kar Yung , Frank A. Hagen , Weizheng Wang
IPC分类号： H01Q322
CPC分类号： H01Q3/26 , H01Q3/30 , H01Q25/00
摘要： A method for beamforming signals for an array of receiving or transmitting elements includes the steps of selecting a beam elevation and azimuth and grouping elements of an antenna array into element ensembles that are substantially aligned with a wavefront projection on the antenna array corresponding to the selected beam elevation and azimuth.
摘要翻译：用于波束成形用于接收或发射元件阵列的信号的方法包括以下步骤：选择波束高度和方位角，并将天线阵列的元件分组为元件集合，其基本上对准天线阵列上对应于所选择的波束的波前投影高程和方位角。

97. 发明授权

US06377208B2 Method and system for determining a position of a transceiver unit utilizing two-way ranging in a polystatic satellite configuration 失效
标题翻译：用于使用多声道卫星配置中的双向测距来确定收发器单元的位置的方法和系统
公开(公告)号：US06377208B2
公开(公告)日：2002-04-23
申请号：US08803937
申请日：1997-02-21
申请人： Donald C. D. Chang , Kar W. Yung , John I. Novak, III , Robert R. Holden
发明人： Donald C. D. Chang , Kar W. Yung , John I. Novak, III , Robert R. Holden
IPC分类号： G01S504
CPC分类号： G01S19/46 , G01S5/0054 , G01S5/14 , G01S13/003 , G01S13/878 , G01S19/03 , G01S19/09 , G01S19/15 , G01S19/49
摘要： A method and system for determining a position of an object utilizes two-way ranging and polystatic techniques. A first communication transceiver at a first known location provides a bidirectional communication path between the first communication transceiver and the object wherein the first communication transceiver transmits a first ranging signal to the object and the object transmits a second ranging signal to the first communication transceiver in response to the first ranging signal. The first communication transceiver further provides a first unidirectional communication path between the first communication transceiver and the object wherein the first communication transceiver performs one of transmitting a third ranging signal to the object and receiving a fourth ranging signal from the object. A second communication transceiver at a second known location provides a second unidirectional communication path between the second communication transceiver and the object wherein the second communication transceiver performs one of transmitting a third ranging signal to the object and receiving a fourth ranging signal from the object. A signal processor determines a first path length corresponding to a first time length of the bidirectional communication path, a second path length corresponding to a second time length of the first and second unidirectional communication paths, and the position of the object based on the first and second known locations and the first and second path lengths.
摘要翻译：用于确定物体位置的方法和系统利用双向测距和聚偏振技术。在第一已知位置处的第一通信收发器提供第一通信收发器和对象之间的双向通信路径，其中第一通信收发器向对象发送第一测距信号，并且对象将响应中的第二测距信号发送到第一通信收发信机到第一个测距信号。第一通信收发器还提供第一通信收发器和对象之间的第一单向通信路径，其中第一通信收发器执行向对象发送第三测距信号并从对象接收第四测距信号。在第二已知位置处的第二通信收发器在第二通信收发器和对象之间提供第二单向通信路径，其中第二通信收发器执行向对象发送第三测距信号并从对象接收第四测距信号之一。信号处理器确定对应于双向通信路径的第一时间长度的第一路径长度，对应于第一和第二单向通信路径的第二时间长度的第二路径长度，以及基于第一和第二单向通信路径的对象的位置第二已知位置和第一和第二路径长度。

98. 发明授权

US06313790B2 Method and system for determining a position of a transceiver in a communications network 有权
公开(公告)号：US06313790B2
公开(公告)日：2001-11-06
申请号：US09780103
申请日：2001-02-09
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.

99. 发明授权

US4783640A Simultaneous-delay correlator apparatus 失效
标题翻译：同步延迟相关器装置
公开(公告)号：US4783640A
公开(公告)日：1988-11-08
申请号：US138541
申请日：1987-12-28
申请人： Samuel C. Reynolds , Donald C. D. Chang
发明人： Samuel C. Reynolds , Donald C. D. Chang
IPC分类号： G01R29/00 , G01R23/163 , G01R23/175 , H01P5/16 , H01P9/00 , H01P5/12
CPC分类号： H01P5/16 , G01R23/163 , G01R23/175
摘要： A correlator apparatus that simultaneously delays two time-varying input signals using just a single transmission line, with the signals being connected to opposite ends of the line. Directional couplers spaced along the transmission line extract delayed versions of the two input signals, for correlation by a bank of correlators, to produce a correlation envelope for the two signals. The apparatus is substantially less massive than prior apparatus of this kind and can be easily constructed and aligned.

100. 发明授权

US4717919A Feedback limited adaptive antenna with signal environment power level compensation 失效
标题翻译：反馈限制自适应天线，具有信号环境功率电平补偿
公开(公告)号：US4717919A
公开(公告)日：1988-01-05
申请号：US737767
申请日：1985-05-28
申请人： Alan R. Cherrette , Donald C. D. Chang
发明人： Alan R. Cherrette , Donald C. D. Chang
IPC分类号： G01S7/28 , H01Q3/26 , G01S3/16 , G01S3/28
CPC分类号： H01Q3/2617 , G01S7/2813
摘要： An adaptive antenna comprising at least two sensors for receiving electromagnetic signals and for producing first signals; the antenna further including divider means for dividing each first signal into respective second and third signals; weighting means for modifying each respective second signal according to a quantized weighting function; summing means for summing the respective second signals to provide a fourth signal; means for producing a system feedback signal in response to the fourth signal; limiter means for limiting the dynamic range of the system feedback signal; correlator means for correlating the respective third signals with the limited system feedback signal to produce respective correlator output signals; means for determining the signal environment power level of the far field sensed by the at least two sensors and for providing a fifth signal substantially corresponding to 1/.sqroot.P, where P is the signal power level incident on the adaptive array; and means for modifying the weighting function based upon the correlator output signals and the fifth signal.
摘要翻译：一种自适应天线，包括用于接收电磁信号和产生第一信号的至少两个传感器; 所述天线还包括用于将每个第一信号分成相应的第二和第三信号的分频装置; 加权装置，用于根据量化加权函数修改每个相应的第二信号; 求和装置，用于对各个第二信号求和以提供第四信号; 用于响应于第四信号产生系统反馈信号的装置; 限制器用于限制系统反馈信号的动态范围; 相关器装置，用于使相应的第三信号与有限系统反馈信号相关，以产生相应的相关器输出信号; 用于确定由所述至少两个传感器感测的远场的信号环境功率电平并用于提供基本上对应于1/2 ROOT和上升和下降的第五信号的装置，其中P是入射在自适应阵列上的信号功率电平; 以及用于基于所述相关器输出信号和所述第五信号来修改所述加权函数的装置。

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