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1. 发明授权

US5077562A Digital beam-forming technique using temporary noise injection 失效
标题翻译：使用临时噪声注入的数字波束形成技术
公开(公告)号：US5077562A
公开(公告)日：1991-12-31
申请号：US632846
申请日：1990-12-24
申请人： Donald C. Chang , Kar W. Yung , Joseph G. Gurley , Urban A. Van Der Embse
发明人： Donald C. Chang , Kar W. Yung , Joseph G. Gurley , Urban A. Van Der Embse
IPC分类号： G01S7/02 , G01S7/526 , H01Q3/26
CPC分类号： H01Q3/26
摘要： An efficient digital beam-forming network (100) utilizing a relatively few small-scale A/D converters is disclosed herein. The inventive beam-forming network (100) is disposed to generate an output beam B in response to a set of N input signals. The set of input signals is provided by an antenna array (110) having N elements, upon which is incident an electromagnetic wavefront of a first carrier frequency. The present invention includes an orthogonal encoder circuit (170) for generating a set of N orthogonal voltage waveforms. A set of biphase modulators (162-168) modulates the phase of each of the input signals in response to one of the orthogonal voltage waveforms, thereby generating a set of N phase modulated input signals. The N phase modulated input signals are combined within an adder (180) to form a composite input signal. The inventive network (100) further includes a downconverting mixer (184) for generating an IF input signal in response to the composite input signal. The IF input signal is then separated into baseband in-phase and quadrature-phase components by an I/Q split network 192. A pair of A/D converters (198, 200) then sample the in-phase and quadrature-phase components of the input signal. A decoder (202), coupled to the orthogonal encoder circuit (170), provides decoded digitial in-phase signals and decoded digital quadrature phase signals in response to the digital in-phase and quadrature-phase signals. The present invention further includes a digital beam-former (130) for generating the output beam B by utilizing the decoded in-phase and quadrature-phase signals.

2. 发明授权

US5142291A Passive microwave near-field tomographic imaging system and method 失效
标题翻译：被动微波近场成像系统及方法
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.

3. 发明授权

US07198230B2 Method and system for maximizing satellite constellation coverage 失效
标题翻译：卫星星座覆盖最大化的方法和系统
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。

4. 发明授权

US06460808B2 Satellite system and method of deploying same 有权
公开(公告)号：US06460808B2
公开(公告)日：2002-10-08
申请号：US10008675
申请日：2001-10-23
申请人： Frank Taormina , Donald C. D. Chang , Kar W. Yung , David C. Cheng , William W. Mayfield , John Novak, III , Arthur W. Wang
发明人： Frank Taormina , Donald C. D. Chang , Kar W. Yung , David C. Cheng , William W. Mayfield , John Novak, III , Arthur W. Wang
IPC分类号： B64G100
CPC分类号： H04B7/195
摘要： A satellite communication system has a first deployment of a plurality of satellites deployed in a medium earth orbit and two later deployments of a plurality of satellites deployed in the medium earth orbit. The first deployment is spaced so that the second deployment may be easily deployed and interleaved into the first deployment. A ground terminal is used for communicating with the satellites in the first and second deployments.

5. 发明授权

US06257526B1 Satellite system and method of deploying same 有权
标题翻译：卫星系统及其部署方法
公开(公告)号：US06257526B1
公开(公告)日：2001-07-10
申请号：US09188440
申请日：1998-11-09
申请人： Frank Taormina , Donald C. D. Chang , Kar W. Yung , David C. Cheng , William W. Mayfield , John Novak, III , Arthur W. Wang
发明人： Frank Taormina , Donald C. D. Chang , Kar W. Yung , David C. Cheng , William W. Mayfield , John Novak, III , Arthur W. Wang
IPC分类号： B46G100
CPC分类号： H04B7/195
摘要： A satellite communication system has a first deployment of a plurality of satellites deployed in a medium earth orbit and two later deployments of a plurality of satellites deployed in the medium earth orbit. The first deployment is spaced so that the second deployment may be easily deployed and interleaved into the first deployment. A ground terminal is used for communicating with the satellites in the first and second deployments.
摘要翻译：卫星通信系统首先部署在中等地球轨道上部署的多个卫星，以及部署在中等地球轨道上的多个卫星的两个后续部署。第一部署是间隔开的，使得第二部署可以容易地部署和交错到第一部署中。接地终端用于与第一和第二部署中的卫星进行通信。

6. 发明授权

US07215954B1 Resource allocation method for multi-platform communication system 有权
标题翻译：多平台通信系统的资源分配方法
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。

7. 发明授权

US06909875B1 Multi-platform wireless communication system for a variety of different user types 有权
标题翻译：多平台无线通信系统，适用于各种不同的用户类型
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。

8. 发明授权

US06807397B2 Method for identifying growth limits of handheld services for mobile satellite communications 有权
标题翻译：识别移动卫星通信手持服务增长限制的方法
公开(公告)号：US06807397B2
公开(公告)日：2004-10-19
申请号：US10264197
申请日：2002-10-03
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。

9. 发明授权

US06785553B2 Position location of multiple transponding platforms and users using two-way ranging as a calibration reference for GPS 有权
标题翻译：使用双向测距作为GPS的校准参考的多个反应平台和用户的位置
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。

10. 发明授权

US06336612B1 Satellite system and method of deploying same 有权
标题翻译：卫星系统及其部署方法
公开(公告)号：US06336612B1
公开(公告)日：2002-01-08
申请号：US09783862
申请日：2001-02-13
申请人： Frank Taormina , Donald C.D. Chang , Kar W. Yung , David C. Cheng , William W. Mayfield , John Novak, III , Arthur W. Wang
发明人： Frank Taormina , Donald C.D. Chang , Kar W. Yung , David C. Cheng , William W. Mayfield , John Novak, III , Arthur W. Wang
IPC分类号： B64G100
CPC分类号： H04B7/195
摘要： A satellite communication system has a first deployment of a plurality of satellites deployed in a medium earth orbit and two later deployments of a plurality of satellites deployed in the medium earth orbit. The first deployment is spaced so that the second deployment may be easily deployed and interleaved into the first deployment. A ground terminal is used for communicating with the satellites in the first and second deployments.
摘要翻译：卫星通信系统首先部署在中等地球轨道上部署的多个卫星，以及部署在中等地球轨道上的多个卫星的两个后续部署。第一部署是间隔开的，使得第二部署可以容易地部署和交错到第一部署中。接地终端用于与第一和第二部署中的卫星进行通信。

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