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1. 发明授权

US07679554B1 Communications link time transfer to improve navigation system accuracy 有权
标题翻译：通信链路时间传输，提高导航系统的准确性
公开(公告)号：US07679554B1
公开(公告)日：2010-03-16
申请号：US12167897
申请日：2008-07-03
申请人： Patrick Y Hwang , Bernard A. Schnaufer , David A. Anderson , Gary A. McGraw
发明人： Patrick Y Hwang , Bernard A. Schnaufer , David A. Anderson , Gary A. McGraw
IPC分类号： G01S5/14 , G01S1/00
CPC分类号： G01S19/15 , G01S19/235 , G01S19/41
摘要： A method and apparatus for improving differential navigation accuracy uses time transfer over a two-way communications link. The communications link transmits an overall time offset between a differential reference station and a remote user. A differential navigation position solution is modified at the remote user with the overall time offset to improve the differential navigation accuracy. A first time offset between a first communications device and a first navigation receiver at the remote user is determined. A second time offset between the first communications device at the remote user and a second communications device at the differential reference station is determined. A third time offset between the second communications device and a second navigation receiver at the differential reference station is determined. An overall time offset from the first time offset, the second time offset, and the third time offset is computed and used to improve the differential navigation accuracy.
摘要翻译：用于改善差分导航精度的方法和装置使用双向通信链路上的时间传递。通信链路传输差分参考站和远程用户之间的整体时间偏移。差分导航位置解决方案在远程用户处被修改，具有总时间偏移量，以提高差分导航精度。确定远程用户的第一通信设备和第一导航接收器之间的第一时间偏移。确定远程用户的第一通信设备与差分参考站处的第二通信设备之间的第二时间偏移。确定第二通信设备和差分参考站处的第二导航接收机之间的第三次偏移。计算出与第一时间偏移，第二时间偏移和第三时间偏移的总体时间偏移，并用于提高差分导航精度。

2. 发明授权

US06738015B1 Vector extended range correlation tracking of global positioning system (GPS) signals 有权
标题翻译：全球定位系统（GPS）信号的矢量扩展范围相关跟踪
公开(公告)号：US06738015B1
公开(公告)日：2004-05-18
申请号：US10308949
申请日：2002-12-03
申请人： Paul D. Linhart , Gary A. Mc Graw , Bernard A. Schnaufer
发明人： Paul D. Linhart , Gary A. Mc Graw , Bernard A. Schnaufer
IPC分类号： H04B7185
CPC分类号： G01S19/26 , G01S19/30 , G01S19/47
摘要： A vector extended range correlation (ERC) apparatus and method tracks signals transmitted from satellites in a GPS network in extremely low signal to interference plus noise ratio (SINR) environments. A GPS receiver antenna receives the signals transmitted from the satellite, and the signals are converted into digital input signals for each satellite on individual channels. A pseudorange error measurement is generated for each individual channel, and the pseudorange error measurements for all of the individual channels are operated on to generate line-of-sight (LOS) signal tracking commands for each individual channel that are based on the pseudorange error measurements for all of the individual channels. Timing and frequency states for each individual channel are updated based on the LOS signal tracking commands for the respective individual channel.
摘要翻译：矢量扩展距离相关（ERC）装置和方法在极低信噪比（SINR）环境中跟踪从GPS网络中的卫星发送的信号。 GPS接收机天线接收从卫星发送的信号，并且信号被转换成各个信道上的每个卫星的数字输入信号。为每个单独通道生成伪距误差测量值，并对所有单个通道进行伪距测量误差测量，以产生基于伪距误差测量值的每个单独通道的视距（LOS）信号跟踪命令为所有的个人频道。基于相应单独信道的LOS信号跟踪命令来更新每个单独信道的定时和频率状态。

3. 发明授权

US06636558B1 Multipath mitigation approach for spread spectrum ranging/positioning systems 失效
标题翻译：用于扩频测距/定位系统的多径缓解方法
公开(公告)号：US06636558B1
公开(公告)日：2003-10-21
申请号：US09386067
申请日：1999-08-30
申请人： Bernard A. Schnaufer , Gary A. McGraw
发明人： Bernard A. Schnaufer , Gary A. McGraw
IPC分类号： H04B1713
CPC分类号： H04B1/7085 , G01S19/22 , H04B1/709 , H04B2201/70715
摘要： An apparatus and method for mitigating multipath interference in a spread spectrum ranging/positioning system receiver is disclosed. Improved peak tracking in the presence of multipath interference is accomplished with an improved discrimiriant. The discriminant may be developed from a curvilinear function based on a minimal number of correlators. Also disclosed is an open loop measurement compensation innovation that compensates for a multipath-induced shift of the correlation function peak. The positioning system receiver may have either one or both of the mitigation features.
摘要翻译：公开了一种用于减轻扩频测距/定位系统接收机中的多径干扰的装置和方法。在存在多路径干扰的情况下改进的峰值跟踪是通过改进的识别符来实现的。判别式可以从基于最小数目的相关器的曲线函数展开。还公开了一种开环测量补偿创新，其补偿相关函数峰值的多径诱发移位。定位系统接收器可以具有缓解特征中的一个或两个。

4. 发明授权

US08010287B1 Frequency hopping data link approach to autonomous GPS denied relative navigation determination 有权
标题翻译：跳频数据链路方式自主GPS拒绝相对导航确定
公开(公告)号：US08010287B1
公开(公告)日：2011-08-30
申请号：US11891922
申请日：2007-08-14
申请人： Robert J. Frank , Scott J. Zogg , Gary A. McGraw , Dana J. Jensen , Bernard A. Schnaufer
发明人： Robert J. Frank , Scott J. Zogg , Gary A. McGraw , Dana J. Jensen , Bernard A. Schnaufer
IPC分类号： G01S1/24 , B64D39/00 , G06F19/00
CPC分类号： G01S5/0284 , B64D39/00 , G01S5/12 , G01S19/18 , G01S19/47 , G01S19/51
摘要： The present invention is directed to accurate GPS (global positioning system)-free relative navigation between an unmanned aerial vehicle (UAV) and a tanker aircraft. The UAV transmits a signal which is received by an antenna array at the tanker aircraft. Horizontal relative position of the UAV is determined by calculating range and bearing based on time and phase differences in the received signal. Vertical relative position of the UAV is determined by comparing the altitude of the UAV with the altitude of the tanker aircraft. The tanker aircraft then transmits a navigation solution based on the relative position of the UAV which is received by the UAV. The UAV may utilize the navigation solution transmitted by the tanker aircraft as a backup to a GPS determined navigation solution, in a GPS denied scenario, or in combination with an INS (inertial navigation system) determined navigation solution.
摘要翻译：本发明涉及无人驾驶飞行器（UAV）和油罐飞机之间的精确GPS（全球定位系统）的相对导航。无人机在油轮飞机上发射由天线阵列接收的信号。通过基于接收信号中的时间和相位差计算范围和方位来确定UAV的水平相对位置。无人机的垂直相对位置通过将无人机的高度与油轮飞机的高度进行比较来确定。然后，油罐飞机基于由UAV接收的UAV的相对位置发送导航解决方案。无人机可以利用由油轮飞机发送的导航解决方案作为GPS确定的导航解决方案的备份，在GPS拒绝场景中，或与INS（惯性导航系统）确定的导航解决方案组合。

5. 发明授权

US07405694B1 Communication link time transfer to improve navigation system accuracy 有权
标题翻译：通信链路时间传输，提高导航系统的准确性
公开(公告)号：US07405694B1
公开(公告)日：2008-07-29
申请号：US11368782
申请日：2006-03-06
申请人： Patrick Y. Hwang , Bernard A. Schnaufer , David A. Anderson , Gary A. McGraw
发明人： Patrick Y. Hwang , Bernard A. Schnaufer , David A. Anderson , Gary A. McGraw
IPC分类号： G01S1/00 , H04B7/185 , H04Q7/20
CPC分类号： G01S19/15 , G01S19/235 , G01S19/41
摘要： A method and apparatus for improving differential navigation accuracy uses time transfer over a two-way communications link. The communications link transmits an overall time offset between a differential reference station and a remote user. A differential navigation position solution is modified at the remote user with the overall time offset to improve the differential navigation accuracy. A first time offset between a first communications device and a first navigation receiver at the remote user is determined. A second time offset between the first communications device at the remote user and a second communications device at the differential reference station is determined. A third time offset between the second communications device and a second navigation receiver at the differential reference station is determined. An overall time offset from the first time offset, the second time offset, and the third time offset is computed and used to improve the differential navigation accuracy.
摘要翻译：用于改善差分导航精度的方法和装置使用双向通信链路上的时间传递。通信链路传输差分参考站和远程用户之间的整体时间偏移。差分导航位置解决方案在远程用户处被修改，具有总时间偏移量，以提高差分导航精度。确定远程用户的第一通信设备和第一导航接收器之间的第一时间偏移。确定远程用户的第一通信设备与差分参考站处的第二通信设备之间的第二时间偏移。确定第二通信设备和差分参考站处的第二导航接收机之间的第三次偏移。计算出与第一时间偏移，第二时间偏移和第三时间偏移的总体时间偏移，并用于提高差分导航精度。

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