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1. 发明授权

US5455964A Stabilization of frequency and power in an airborne communication system 失效
标题翻译：在机载通信系统中稳定频率和功率
公开(公告)号：US5455964A
公开(公告)日：1995-10-03
申请号：US42426
申请日：1993-03-26
申请人： David A. Roos , John R. Clewer , Seok-Ho Kim , James E. Malcolm , Andrew W. Brandt , Allan A. D'Souza , Adrian J. Morris , Matthew M. Mohebbi
发明人： David A. Roos , John R. Clewer , Seok-Ho Kim , James E. Malcolm , Andrew W. Brandt , Allan A. D'Souza , Adrian J. Morris , Matthew M. Mohebbi
IPC分类号： H03J7/02 , H04B7/185 , H04W48/12 , H04Q7/38 , G01S3/52 , H04B1/10 , H04B7/26
CPC分类号： H04B7/18506 , H03J7/02 , H04W48/12
摘要： The frequency and power of transmissions in a mobile communication system, such as an air-to-ground telephony system, are stabilized without a priori knowledge of the system gain factors or frequency references. The ground station monitors the available channels and modifies a vacant channel broadcast message to provide information that the channel is available. In this way, the air terminals have knowledge of all available channels. The ground station transmits a pilot signal. Upon request by a user for a dial tone at the air terminal, the air terminal selects a vacant channel and scans for the pilot signal. The air terminal estimates a distance to the ground station and sets a power level of a seizing transmission based on the estimated distance. The air terminal also estimates a Doppler frequency shift of the selected channel due to the relative movement of the air terminal with respect to the ground station and sets a frequency of the seizing transmission based on the estimated Doppler frequency shift. The air terminal then transmits a channel seizing signal at a reduced bandwidth less than a full normal bandwidth to the ground station at the set level and frequency. The ground station measures the level and frequency of the seizing signal and transmits to the air terminal information acknowledging the seizure of the selected channel and reporting the level and frequency of the seizing signal. The air terminal corrects the transmitted level and frequency and then switches the transmission bandwidth to the full normal bandwidth at the corrected level.
摘要翻译：移动通信系统（例如空对地电话系统）中的传输的频率和功率在没有系统增益因子或频率参考的先验知识的情况下是稳定的。地面站监视可用频道并修改空闲频道广播消息以提供信道可用的信息。这样，空中终端就可以获得所有可用频道的知识。地面站发送导频信号。根据用户在空中终端的拨号音请求，空中终端选择空闲信道并扫描导频信号。空中终端估计到地面站的距离，并基于估计的距离设置占用传输的功率电平。空中终端还估计由于空中终端相对于地面站的相对移动而选择的信道的多普勒频移，并且基于估计的多普勒频移来设置占用传输的频率。然后，空中终端以设定的等级和频率向地面站发送小于全正常带宽的减少带宽的信道占用信号。地面站测量占用信号的电平和频率，并向空中终端发送确认占用所选频道的信息，并报告占用信号的电平和频率。空中终端校正发送的电平和频率，然后将发送带宽切换到校正电平的完全正常带宽。

2. 发明授权

US08542667B2 High capacity satellite communications system 有权
公开(公告)号：US08542667B2
公开(公告)日：2013-09-24
申请号：US13086505
申请日：2011-04-14
申请人： David A. Roos , Adrian Morris , Stanley Kay
发明人： David A. Roos , Adrian Morris , Stanley Kay
IPC分类号： H04L12/28
CPC分类号： H04B7/18528 , H04B7/18513 , H04B7/2041 , H04W72/0453 , H04W88/06
摘要： A high capacity satellite communications system including a satellite with a beam for a forward downlink focused on a geographic area for which disproportionately higher capacity is desired, a hub located in a geographic area for which disproportionately lower capacity is desired, compared to the location of a VSAT, and the VSAT located in area where a beam for a forward downlink received by the VSAT from the satellite does not overlap with a beam for a return downlink received by the hub from a satellite.

3. 发明授权

US5589837A Apparatus for positioning an antenna in a remote ground terminal 失效
标题翻译：用于将天线定位在远程接地终端中的装置
公开(公告)号：US5589837A
公开(公告)日：1996-12-31
申请号：US384060
申请日：1995-02-06
申请人： Mohammad Soleimani , John E. Corrigan, III , Mohammad Bukhari , David A. Roos
发明人： Mohammad Soleimani , John E. Corrigan, III , Mohammad Bukhari , David A. Roos
IPC分类号： H01Q1/12 , H01Q3/00
CPC分类号： H01Q1/1257
摘要： An apparatus for positioning a directional antenna of a remote ground terminal which transmits and receives signals to and from a satellite via the antenna. The apparatus includes a signal generator for producing a frequency variable reference signal having a variable duty cycle, and a controller which operates to analyze the signals received from the satellite and to vary the duty cycle of the reference signal in accordance with an identification tag forming part of the received signals. The apparatus further includes a detector which receives the reference signal and produces an antenna pointing signal having an average amplitude proportional to the duty cycle of the reference signal. The controller commands the signal generator to produce a reference signal having a first duty cycle when a signal having an identification tag not corresponding to a designated central hub station is received by the antenna, and a reference signal having a second duty cycle when a signal having an identification tag corresponding to the designated central hub station is received by the antenna. The reference signal having the first duty cycle causes the average amplitude of the antenna pointing signal to equal a first value, while a reference signal having the second duty cycle causes the average amplitude of the antenna pointing signal to equal a second value. During installation, the antenna is rotated until the average amplitude of the antenna pointing signal equals the second value.
摘要翻译：一种用于定位通过天线向卫星发送信号和从卫星接收信号的远程接地终端的定向天线的装置。该装置包括用于产生具有可变占空比的频率可变参考信号的信号发生器，以及用于分析从卫星接收的信号并根据识别标签形成部分改变参考信号的占空比的控制器的接收信号。该装置还包括检测器，其接收参考信号并产生具有与参考信号的占空比成比例的平均振幅的天线指向信号。当具有不对应于所指定的中心中心站的识别标签的信号被天线接收时，控制器命令信号发生器产生具有第一占空比的参考信号，以及具有第二占空比的参考信号，当具有由天线接收与指定的中心中心站对应的识别标签。具有第一占空比的参考信号使得天线指向信号的平均幅度等于第一值，而具有第二占空比的参考信号使得天线指向信号的平均振幅等于第二值。在安装过程中，天线旋转直到天线指向信号的平均幅度等于第二个值。

4. 发明授权

US5577074A Combined clock recovery/frequency stabilization loop 失效
标题翻译：组合时钟恢复/频率稳定回路
公开(公告)号：US5577074A
公开(公告)日：1996-11-19
申请号：US546028
申请日：1995-10-20
申请人： David A. Roos , Robert W. Davis, III
发明人： David A. Roos , Robert W. Davis, III
IPC分类号： H04L7/00 , H04L7/033 , H03D3/18
CPC分类号： H04L7/0331 , H04L7/0079
摘要： The effects of long-term drift in a local reference oscillator are compensated by dividing the local reference oscillator frequency by one of three divider patterns (nominal ratio, add a cycle, delete a cycle) so that the symbol clock of the remote terminal is equal to the outroute symbol rate. The number of add a cycle and delete a cycle divider patterns are counted and stored. The average of the number of add a cycle and delete a cycle patterns is used to control the transmit frequency of the remote terminal to correspond to the outroute symbol rate. Thus, the clock recovery process generates a frequency calibration number used to track the frequency of the remote terminal local reference oscillator and to adjust the transmit frequency of the remote terminal accordingly.
摘要翻译：通过将本地参考振荡器频率除以三个分频器模式（标称比率，加一个周期，删除一个周期）之一来补偿本地参考振荡器中的长期漂移的影响，以使远程终端的符号时钟相等到符号率。计数并存储添加周期和删除周期分频器模式的数量。通过添加循环次数和删除循环模式的平均值来控制远程终端的发送频率，以对应于路由符号率。因此，时钟恢复处理产生用于跟踪远程终端本地参考振荡器的频率的频率校准数，并相应地调整远程终端的发射频率。

5. 发明授权

US5309439A TDMA system with a virtual reference 失效
标题翻译： TDMA系统具有虚拟参考
公开(公告)号：US5309439A
公开(公告)日：1994-05-03
申请号：US799809
申请日：1991-11-29
申请人： David A. Roos
发明人： David A. Roos
IPC分类号： H04B7/212 , H04J3/06 , H04L7/04
CPC分类号： H04B7/2125 , H04J3/0652 , H04J3/0682 , H04L7/04
摘要： A TDMA system operates without the requirement for a reference burst. A station in the TDMA system monitors the bursts from other stations to determine the virtual reference. The virtual reference is then used as the basis, at the station, for transmitting its own burst. For carrier-based TDMA systems, the station can also determine a virtual carrier reference. This is implemented by measuring the received carrier from a plurality of bursts. The received carrier frequency of all of the bursts that have been received can then be averaged, and after correcting for frequency translation introduced by the transponder, the result can be employed as a virtual carrier reference.
摘要翻译： TDMA系统操作而不需要参考突发。 TDMA系统中的站监视来自其他站的突发以确定虚拟参考。然后，虚拟参考用作基站，用于发送其自身的突发。对于基于载波的TDMA系统，该站还可以确定虚拟载波参考。这通过从多个突发测量接收到的载波来实现。然后可以对接收到的所有突发的接收载波频率进行平均，并且在由应答器引入的频率变换校正之后，可以将结果用作虚拟载波参考。

6. 发明授权

US4751701A TDM collision detector 失效
标题翻译： TDM碰撞检测器
公开(公告)号：US4751701A
公开(公告)日：1988-06-14
申请号：US798051
申请日：1985-11-14
申请人： David A. Roos , Robert A. Summers
发明人： David A. Roos , Robert A. Summers
IPC分类号： H04L12/413 , H04J3/02
CPC分类号： H04L12/40032 , H04L12/413
摘要： A collision detection mechanism includes a transmission protocol which locates a gap in a station's transmission, of fixed duration and position, relative to start of transmission. Collision detection is enhanced since random timing of collisions normally results in filling in the gap. This condition is more readily detectable than detecting the simultaneous presence of energy from two transmitters. The transmission protocol is followed unless the transmitting station detects a collision, in which event gap creation is inhibited. The gap detecting equipment may be located at a network head end.
摘要翻译：冲突检测机构包括相对于发送开始，定位站的传输中的间隙，固定持续时间和位置的传输协议。碰撞检测得到增强，因为碰撞的随机定时通常导致填补间隙。与检测来自两个发射器的能量的同时存在相比，该条件更容易检测。遵循传输协议，除非发送站检测到冲突，在这种情况下，间隙创建被禁止。间隙检测设备可以位于网络头端。

7. 发明授权

US08559357B2 Method and apparatus for a triple use satellite system 有权
标题翻译：三用卫星系统的方法和装置
公开(公告)号：US08559357B2
公开(公告)日：2013-10-15
申请号：US13086628
申请日：2011-04-14
申请人： David A. Roos , Adrian Morris , Stanley Kay , Pradman Kaul
发明人： David A. Roos , Adrian Morris , Stanley Kay , Pradman Kaul
IPC分类号： H04B7/185
CPC分类号： H04B7/18523 , H04B7/18528 , H04B7/18578 , H04B7/2041
摘要： A triple use satellite system includes a VSAT population including a VSAT, and a satellite including a broadcast beam for a broadcast service and spot beams for a broadband service, where each of the spot beams provides broadband service to VSATs in separate coverage areas in a geographic region and the broadcast beam provides a broadcast service to the VSAT population in the geographic region.
摘要翻译：三重使用的卫星系统包括包括VSAT的VSAT群和包括用于广播服务的广播波束的卫星和用于宽带服务的点波束，其中每个点波束在地理上分开的覆盖区域中向VSAT提供宽带服务区域，并且广播波束向地理区域中的VSAT群体提供广播服务。

8. 发明申请

US20110255463A1 METHOD AND APPARATUS FOR A TRIPLE USE SATELLITE SYSTEM 有权
标题翻译：用于三重使用卫星系统的方法和装置
公开(公告)号：US20110255463A1
公开(公告)日：2011-10-20
申请号：US13086628
申请日：2011-04-14
申请人： David A. Roos , Adrian Morris , Stanley Kay , Pradman Kaul
发明人： David A. Roos , Adrian Morris , Stanley Kay , Pradman Kaul
IPC分类号： H04W84/06
CPC分类号： H04B7/18523 , H04B7/18528 , H04B7/18578 , H04B7/2041
摘要： A triple use satellite system includes a VSAT population including a VSAT, and a satellite including a broadcast beam for a broadcast service and spot beams for a broadband service, where each of the spot beams provides broadband service to VSATs in separate coverage areas in a geographic region and the broadcast beam provides a broadcast service to the VSAT population in the geographic region.
摘要翻译：三重使用的卫星系统包括包括VSAT的VSAT群和包括用于广播服务的广播波束的卫星和用于宽带服务的点波束，其中每个点波束在地理上分开的覆盖区域中向VSAT提供宽带服务区域，并且广播波束向地理区域中的VSAT群体提供广播服务。

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