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1. 发明授权

US06366599B1 Fast acquisition of spread-spectrum signals by dynamically varying spacing of search bins 失效
标题翻译：通过动态变化搜索箱的间距来快速获取扩频信号
公开(公告)号：US06366599B1
公开(公告)日：2002-04-02
申请号：US09040521
申请日：1998-03-16
申请人： Andrew B. Carlson , Jeffrey Crerie , David C. Westcott , Paul F. Turney
发明人： Andrew B. Carlson , Jeffrey Crerie , David C. Westcott , Paul F. Turney
IPC分类号： H04L2730
CPC分类号： G01S19/30 , G01S19/34 , H04B1/708
摘要： A Global Positioning System (GPS) receiver employs variable spacing of Doppler offset bins and code offset bins when acquiring a P(Y) code, to improve signal acquisition characteristics with respect to a search region having a plurality of Doppler offset bins and code offset bins. The receiver includes an acquisition module in which an input signal representative of a received P(Y) code is received and applied to a first programmable rate mixer. An output of the first programmable rate mixer is applied to a combiner, which selectively combines samples of the input signal based on a control input to dynamically determine the spacing of the code offset bins. An output of the combiner is normalized and applied to a correlation unit, which generates correlation measures of the received P(Y) code and a locally generated P(Y) code. A signal representative of the correlation measures is applied separately to each of a set of programmable rate mixers and mixed with separate mixing signals. The spacing of the Doppler offset bins is dynamically determined by controlling the rates of the mixing signals.
摘要翻译：全球定位系统（GPS）接收机在获取P（Y）码时采用多普勒偏移箱和码偏移箱的可变间距，以改善相对于具有多个多普勒偏移箱和码偏移箱的搜索区域的信号采集特性。接收机包括采集模块，其中接收表示接收的P（Y）码的输入信号并将其应用于第一可编程速率混频器。第一可编程速率混合器的输出被施加到组合器，组合器基于控制输入选择性地组合输入信号的样本，以动态地确定码偏移仓的间隔。合成器的输出被归一化并应用于相关单元，该相关单元产生接收到的P（Y）码和本地生成的P（Y）码的相关度量。表示相关性测量的信号分别应用于一组可编程速率混合器中的每一个并与单独的混合信号混合。通过控制混合信号的速率来动态地确定多普勒偏移箱的间隔。

2. 发明授权

US5678169A Receivers for down-conversion of L1 and L2 carrier frequency transmissions from orbiting global positioning system (GPS) satellites 失效
标题翻译：用于从轨道全球定位系统（GPS）卫星进行L1和L2载波频率传输的下变频的接收机
公开(公告)号：US5678169A
公开(公告)日：1997-10-14
申请号：US497443
申请日：1995-06-30
申请人： Paul F. Turney
发明人： Paul F. Turney
IPC分类号： G01S1/00 , G01S5/14 , G01S19/21 , G01S19/32 , G01S19/36 , H04B17/00 , G01S5/02 , H04B7/185
CPC分类号： G01S19/32 , G01S19/21 , G01S19/37
摘要： An improved navigation satellite receiver with a super heterodyne receiver channel configured to provide a first local oscillator frequency between L1 and L2 such that the down converted intermediate frequencies of L1 and L2 can be processed by the same intermediate frequency stages and a second mixer stage. A radio frequency (RF) selector switch is provided to select between inputting L1 and L2 to the first mixer. The RF switch is controlled by a digital signal processor (DSP) that also provides automatic gain control (AGC) to an intermediate frequency amplifier. Histories and expected levels of AGC for each of L1 and L2 are maintained by the DSP. The RF switch is briefly toggled over to select one of L1 or L2, while tracking a satellite on the other carrier frequency, just long enough to sample the AGC level needed. If the level is too high, given the histories and expectations for such levels, the sampled carrier frequency is assumed to be jammed, and a high risk for switching over. A switch to the sampled L1 or L2 carrier frequency is therefore prevented, which saves satellite tracking from being temporarily or permanently lost.
摘要翻译：一种具有超外差接收信道的改进的导航卫星接收机，被配置为在L1和L2之间提供第一本地振荡器频率，使得L1和L2的下变频中间频率可以由相同的中频级和第二混频级进行处理。提供射频（RF）选择开关，用于在第一混频器输入L1和L2之间进行选择。 RF开关由数字信号处理器（DSP）控制，数字信号处理器（DSP）还向中频放大器提供自动增益控制（AGC）。 L1和L2各自的历史和预期水平由DSP维护。 RF开关短暂翻转以选择L1或L2中的一个，同时跟踪另一个载波频率上的卫星，只需要足够长的时间来采样所需的AGC电平。如果水平太高，给定这些水平的历史和期望，则采样载波频率被假定为卡住，并且转换的风险很大。因此，可以防止切换到采样的L1或L2载波频率，从而节省卫星跟踪暂时或永久丢失。

3. 发明授权

US5615236A Method and apparatus for direct re-acquisition of precision-code after a short power interruption 失效
标题翻译：短时间内直接重新采集精密码的方法和装置
公开(公告)号：US5615236A
公开(公告)日：1997-03-25
申请号：US412554
申请日：1995-03-29
申请人： Paul F. Turney
发明人： Paul F. Turney
IPC分类号： G01S1/00 , H04L7/00
CPC分类号： G01S19/32 , G01S19/235 , G01S19/30
摘要： An improved single or dual-frequency navigation satellite receiver that can directly re-acquire P-code code-phase after a brief loss of P-code tracking. A digital signal processor (DSP) writes its current position fixes to a non-volatile memory. The DSP also updates a clock that keeps a running estimate of precise global positioning system time. When P-code code-phase is lost, it is re-acquired by reading the clock back in, adjusting for its drift, reading in the last position fix from the non-volatile memory, and then beginning an advanced P-code code-phase search based on such head start information.
摘要翻译：改进的单频或双频导航卫星接收机，可以在短暂丢失P码跟踪后直接重新获取P码代码。数字信号处理器（DSP）将其当前的位置锁定写入非易失性存储器。 DSP还会更新一个保持精确的全球定位系统时间的运行估计的时钟。当P码代码相位丢失时，通过读取时钟重新获取时钟，调整其漂移，从非易失性存储器读取最后的位置锁定，然后开始一个高级的P码代码，基于这样的头开始信息进行相位搜索。

4. 发明授权

US5600670A Dynamic channel allocation for GPS receivers 失效
标题翻译： GPS接收机的动态信道分配
公开(公告)号：US5600670A
公开(公告)日：1997-02-04
申请号：US363385
申请日：1994-12-21
申请人： Paul F. Turney
发明人： Paul F. Turney
IPC分类号： G01S1/00 , H04B1/709 , H04B1/711 , H04B1/7117 , H04B15/00 , H04K1/00 , H04L27/30
CPC分类号： H04B1/711 , G01S19/24 , G01S19/37 , H04B1/709 , H04B1/7117 , H04B2201/70715
摘要： The channels of a GPS receiver system are dynamically allocated during acquisition mode to hierarchically chain a slave channel module to a master channel. Each channel circuit includes two correlators, where each correlator receives a digitized received GPS signal and a delayed local PRN reference code signal to provide an output signal to an accumulator. During acquisition, the system provides two correlator channels where each channel includes two correlators for a total of four correllators. A PRN reference code signal is progressively delayed to provide a sequence of progressively delayed PRN reference code signals, where one of the sequence of progressively delayed PRN reference code signals are applied to each of the correlators. Each correlator channel also includes a digital mixer which receives a digitized GPS IF signal and a digital carrier reference signal and which provides the digitized received GPS signal.
摘要翻译：在采集模式期间动态地分配GPS接收机系统的信道，以将从属信道模块分级链接到主信道。每个通道电路包括两个相关器，其中每个相关器接收数字化的接收的GPS信号和延迟的本地PRN参考码信号以向累加器提供输出信号。在采集期间，系统提供两个相关器通道，其中每个通道包括两个相关器，总共四个校正器。 PRN参考码信号被逐渐延迟以提供逐渐延迟的PRN参考码信号的序列，其中逐行延迟的PRN参考码信号的序列中的一个被应用于每个相关器。每个相关器通道还包括数字混合器，其接收数字化的GPS IF信号和数字载波参考信号，并提供数字化的接收到的GPS信号。

5. 发明授权

US5949812A Method and system for conserving battery reserves in a navigation receiver by slowing and/or stopping the system clock during low demand 失效
标题翻译：用于通过在低需求期间减慢和/或停止系统时钟来节省导航接收器中的电池储备的方法和系统
公开(公告)号：US5949812A
公开(公告)日：1999-09-07
申请号：US764480
申请日：1996-12-12
申请人： Paul F. Turney , David C. Westcott
发明人： Paul F. Turney , David C. Westcott
IPC分类号： G01S1/00 , H04B7/216
CPC分类号： G01S19/34
摘要： A battery-operated navigation satellite receiver with an antenna, a radio frequency stage, a down-converter, a digital signal processor and a microcomputer for demodulating L-band microwave carrier frequency spread spectrum transmissions from orbiting navigation satellites that each use their own unique pseudo-random number spreading code. The digital signal processor and a microcomputer each receive system clocks that can be varied in steps from full-speed down to any number of fractions including zero, or full stop. The system clocks to the digital signal processor and a microcomputer are lowered during periods of little or no acquisition or navigation activity. Scheduled updates, communication traffic, user activity, etc., are used to ramp the system clocks back up when the processing load demands it, e.g., when the tasks become CPU-bound at the current clock speed or when a particular task is predetermined to need the full processing speed capability of a particular navigation receiver. The slower system clocks have a direct correspondence with lowered power consumption demands by the digital signal processor and a microcomputer.
摘要翻译：一种具有天线，射频级，下变频器，数字信号处理器和微型计算机的电池供电的导航卫星接收机，用于解调轨道导航卫星的L波段微波载波频谱扩展频谱，每个导频卫星使用自己独特的伪随机码扩展码。数字信号处理器和微型计算机都接收系统时钟，可以从全速下降到包括零或全停的任意数量的分数。系统时钟到数字信号处理器和微型计算机在很少或没有采集或导航活动期间降低。计划更新，通信流量，用户活动等用于在处理负载要求时对系统时钟进行斜坡升级，例如，当任务以当前时钟速度或特定任务预定为CPU限制时需要特定导航接收机的全部处理速度能力。较慢的系统时钟与数字信号处理器和微型计算机的降低的功耗要求直接对应。

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