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1.发明授权Method and apparatus for maintaining the integrity of spacecraft based time and position using GPS 有权使用GPS维持航天器基于时间和位置的完整性的方法和装置
公开(公告)号：US6134484A
公开(公告)日：2000-10-17
申请号：US493482
申请日：2000-01-28
CPC分类号： G01S19/20 , H04B7/18519
摘要： A method and apparatus for maintaining the integrity of spacecraft based time and position using GPS (11) is disclosed. A GPS receiver is provided with a Receiver Autonomous Integrity Monitor (RAIM) processor (12) and a Kalman filter (14). GPS signals are received from at least four GPS satellites and processed in the GPS receiver to provide time and position information. Periodically, an extended fault vector is formed in the Kalman filter with propagated open-loop position and velocity measurements. The extended fault vector is used to isolate and remove failing GPS satellites.
摘要翻译： 公开了一种使用GPS（11）维持基于航天器的时间和位置的完整性的方法和装置。 GPS接收器具有接收机自主完整性监视器（RAIM）处理器（12）和卡尔曼滤波器（14）。 GPS信号从至少四个GPS卫星接收并在GPS接收机中进行处理以提供时间和位置信息。 定期地，在具有传播的开环位置和速度测量的卡尔曼滤波器中形成扩展故障向量。 扩展故障向量用于隔离和去除故障的GPS卫星。
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2.发明授权公开(公告)号：US06535801B1
公开(公告)日：2003-03-18
申请号：US09493825
申请日：2000-01-28
IPC分类号： H04B7185
CPC分类号： G01S19/254 , B64G1/36 , G01S19/11 , G01S19/256 , G01S19/46
摘要： A method of determining the position of a satellite in a near geosynchronous orbit includes receiving at least one main lobe signal from an antenna on a first GPS satellite. A GPS signal, including GPS time and Doppler, is received from a pseudolite positioned on the Earth and an approximate position of each of a plurality of second GPS satellites is determined from an onboard almanac. Side lobe signals and accompanying noise are received from antennas on the plurality of second GPS satellites. The GPS signal and known sequential data bits are used for sorting or integrating the side lobe signals from the accompanying noise and the position of the satellite in a near geosynchronous orbit is determined using the one or more main lobe signals and the sorted side lobe signals.
摘要翻译： 确定卫星在近地球同步轨道中的位置的方法包括从第一GPS卫星上的天线接收至少一个主瓣信号。 从位于地球上的伪卫星接收包括GPS时间和多普勒的GPS信号，并且从船上年历确定多个第二GPS卫星中的每一个的近似位置。 从多个第二GPS卫星上的天线接收旁瓣信号和伴随噪声。 GPS信号和已知的顺序数据位用于对来自伴随噪声的旁瓣信号进行分类或积分，并且使用一个或多个主瓣信号和排序的旁瓣信号来确定卫星在近地球同步轨道中的位置。
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3.发明授权Apparatus and method for synchronizing a clock using a phase-locked loop circuit 失效使用锁相环电路来同步时钟的装置和方法公开(公告)号：US06633621B1
公开(公告)日：2003-10-14
申请号：US09531689
申请日：2000-03-20
申请人： Daniel Eric Bishop , George Jeffrey Geier , Jeffrey Scott Moffett , George Arthur Schauer , Roger Charles Hart , Joel Lloyd Gross
发明人： Daniel Eric Bishop , George Jeffrey Geier , Jeffrey Scott Moffett , George Arthur Schauer , Roger Charles Hart , Joel Lloyd Gross
IPC分类号： H03D324
摘要： A system for synchronizing a clock includes a phase-locked loop (PLL) circuit that generates or receives (304) timing errors that are based on timing information from multiple timing sources. Gain blocks (214) weight (306) the timing errors, which are then combined (308) into a loop time error. A loop integrator (226) integrates (310) the loop time error to produce an input used to adjust (312) an oscillator frequency. A corresponding oscillator clock signal is fed back (240) to one or more phase detectors (206), which receive (302) timing reference signals and generate timing errors. When a timing errors indicates that a problem exists with a timing source, the impact of the problematic timing source is reduced (430, 504), or oscillator frequency adjustments are suspended (608). When used on a satellite (700), at least one of the timing errors can be based on times of transmit and times of arrival of time messages exchanged between the satellite and its neighbors (716).
摘要翻译： 用于同步时钟的系统包括基于来自多个定时源的定时信息生成或接收（
304 ）定时误差的锁相环（PLL）电路。 （ 214 ）权重（ 306 ）定时错误，然后组合（ 308 ）转换为循环时间错误。 循环积分器（ 226 ）将循环时间误差积分（ 310 ）以产生用于调整的输入（ 312 ）振荡器频率。 将相应的振荡器时钟信号反馈（ 240 ）到一个或多个相位检测器（ 206 ）， 302 ）定时参考信号并产生定时误差。 当定时错误表示定时源存在问题时，减少了有问题的定时源的影响（ 430,504 ），或者振荡器频率调整被暂停（< HIL> 608 ）。 当在卫星（ 700 ）上使用时，定时错误中的至少一个可以基于在卫星与其邻居之间交换的时间消息的发送时间和到达时间 （ 716 ）。
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