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1. 发明授权

US06590524B1 Method and means for precise time synchronization 有权
标题翻译：精确时间同步的方法和手段
公开(公告)号：US06590524B1
公开(公告)日：2003-07-08
申请号：US09568104
申请日：2000-05-10
申请人： Michael G. Farley , Jeffrey J. Jorgensen , Jeffrey L. Tuohino , Susan R. Schellenberg , Wilmer A. Mickelson , Mitchell A. Corcoran
发明人： Michael G. Farley , Jeffrey J. Jorgensen , Jeffrey L. Tuohino , Susan R. Schellenberg , Wilmer A. Mickelson , Mitchell A. Corcoran
IPC分类号： G01S502
CPC分类号： G01S19/235 , G01S19/11 , G01S19/37
摘要： Disclosed is a method which synchronizes a slave time with a master time. The master time is derived from a received signal. The master time is compared to the slave time to detect any offset of the slave time relative to the master time. If an offset is detected, the slave time is adjusted to correct the offset. Also disclosed is a method of synchronizing a pseudolite transmitter time with GNSS time. The transmitter time is compared to GNSS time to detect any offset of the transmitter time. The transmitter time is adjusted to correct the offset if an offset is detected. Also disclosed is an improved pseudolite. The pseudolite has a pseudolite transmitter and GNSS receiver. The pseudolite transmitter time is synchronized with GNSS time.
摘要翻译：公开了一种使从时间与主时间同步的方法。主时间来自接收信号。将主机时间与从机时间进行比较，以检测从机时间相对于主机时间的任何偏移。如果检测到偏移，则调整从机时间以校正偏移。还公开了一种使伪卫星发射机时间与GNSS时间同步的方法。将发射机时间与GNSS时间进行比较，以检测发射机时间的任何偏移。如果检测到偏移，则调整发射机时间以校正偏移。还公开了一种改进的伪卫星。伪卫星具有伪卫星发射机和GNSS接收机。伪卫星发射机时间与GNSS时间同步。

2. 发明授权

US06336076B1 Long range GNSS ephemeris data transfer method and apparatus using the same 有权
标题翻译：远程GNSS星历数据传输方法及其使用方法
公开(公告)号：US06336076B1
公开(公告)日：2002-01-01
申请号：US09138883
申请日：1998-08-24
申请人： Michael G. Farley , Joseph M. Strus , Susan R. Schellenberg , Mitchell A. Corcoran
发明人： Michael G. Farley , Joseph M. Strus , Susan R. Schellenberg , Mitchell A. Corcoran
IPC分类号： G01S502
CPC分类号： G01S19/258 , G01S19/11
摘要： Disclosed are methods of transferring satellite ephemeris data for a first GNSS satellite from a pseudolite to a GNSS receiver. Also disclosed are pseudolites and GNSS receivers implementing the same. A first satellite global positioning signal transmitted by the first GNSS satellite is received at the pseudolite. The pseudolite transmits a pseudolite global positioning signal containing the satellite ephemeris data for the first GNSS satellite. The GNSS receiver receives the pseudolite global positioning signal and retrieves from the pseudolite signal the satellite ephemeris data.
摘要翻译：公开了将第一GNSS卫星的卫星星历数据从伪卫星传送到GNSS接收机的方法。还公开了实施相同的伪卫星和GNSS接收机。在伪卫星处接收由第一GNSS卫星发射的第一卫星全球定位信号。伪卫星发送包含第一GNSS卫星的卫星星历数据的伪卫星全球定位信号。 GNSS接收机接收伪卫星全球定位信号，并从伪卫星信号中检索卫星星历数据。

3. 发明授权

US06259400B1 Fast acquisition of GPS signal corrupted by doppler or time delay effects 有权
标题翻译： GPS信号的快速获取被多普勒或时间延迟效应所损坏
公开(公告)号：US06259400B1
公开(公告)日：2001-07-10
申请号：US09526016
申请日：2000-03-15
申请人： William J. Higgins , John R. Bader , Eric D. Nelson , Mitchell A. Corcoran
发明人： William J. Higgins , John R. Bader , Eric D. Nelson , Mitchell A. Corcoran
IPC分类号： H04B7185
CPC分类号： G01S19/18 , F41G7/301 , F41G7/346 , G01S13/86 , G01S19/09 , G01S19/26
摘要： An RF translator is placed on an artillery shell. The RF translator receives a GPS signal, converts the GPS signal to an S band signal, and then transmits the S band signal. The S band signal is received by a ground antenna and it is converted back to an L1 GPS signal. The transmission of the S band signal to a ground antenna induces two effects which make fast direct P(Y) acquisitions difficult. First, since the artillery shell is moving, a carrier Doppler is induced on the S band signal. Second, the time delay caused by the transmission of the S band signal affects the nominal code phase for acquisition. Acquisition of GPS signals corrupted by second frequency data effects require special compensation if fast direct P(Y) code acquisition is desired. A carrier Doppler and a code phase compensation term allow the GPS ground receiver software to focus its search window for the carrier frequency (code rate) and the code phase (time delay). By adding in these new compensation terms, small centered searches can be used and fast direct P(Y) code acquisition is possible.
摘要翻译： RF翻译器放置在炮弹上。 RF转换器接收GPS信号，将GPS信号转换成S波段信号，然后发送S波段信号。 S波段信号由地面天线接收，并被转换回L1 GPS信号。将S波段信号传输到地面天线引起两种难以实现快速直接P（Y）采集的效果。首先，由于炮弹正在移动，所以在S波段信号上感应出载波多普勒。第二，由S波段信号传输引起的时延会影响采集的标称码相位。如果需要快速直接P（Y）码采集，则采集由第二频率数据效应损坏的GPS信号需要特殊补偿。载波多普勒和码相位补偿项允许GPS地面接收机软件将其搜索窗口集中在载波频率（码率）和码相位（时间延迟）上。通过添加这些新的补偿条件，可以使用小中心搜索，并且可以快速直接P（Y）代码获取。

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