公开(公告)号：US11860283B2

公开(公告)日：2024-01-02

申请号：US17946625

申请日：2022-09-16

申请人： GE Aviation Systems Limited

发明人： Stefan Alexander Schwindt

IPC分类号： G01S19/21 ,  G01S19/24 ,  G01S19/29

CPC分类号： G01S19/215 ,  G01S19/21 ,  G01S19/246 ,  G01S19/29

摘要： An aircraft and non-transitory computer-readable medium for detecting the spoofing of a signal from a satellite in orbit. A receiver on the aircraft to receive an apparent satellite signal. A computer for determining at least two characteristic signatures of the signal including a power level, and indicating the apparent satellite signal is a spoofed satellite signal.

公开(公告)号：US09857476B2

公开(公告)日：2018-01-02

申请号：US15584663

申请日：2017-05-02

申请人： TELECOMMUNICATION SYSTEMS, INC.

发明人： Michael B. Mathews ,  Peter F. MacDoran

IPC分类号： G01S19/14 ,  G01S19/37 ,  G01S19/23 ,  G01S19/21 ,  G01S19/24 ,  G01S5/02 ,  G01S11/10 ,  G01S19/11

CPC分类号： G01S19/215 ,  G01S1/024 ,  G01S1/08 ,  G01S1/24 ,  G01S5/021 ,  G01S5/0289 ,  G01S11/10 ,  G01S19/11 ,  G01S19/14 ,  G01S19/23 ,  G01S19/246 ,  G01S19/37 ,  G01S19/46 ,  G01S19/48

摘要： The present invention relates to a system and method using hybrid spectral compression and cross correlation signal processing of signals of opportunity, which may include Global Navigation Satellite System (GNSS) as well as other wideband energy emissions in GNSS obstructed environments. Combining spectral compression with spread spectrum cross correlation provides unique advantages for positioning and navigation applications including carrier phase observable ambiguity resolution and direct, long-code spread spectrum signal acquisition. Alternatively, the present invention also provides unique advantages for establishing the validity of navigation signals in order to counter the possibilities of electronic attack using spoofing and/or denial methods.

公开(公告)号：US09733360B2

公开(公告)日：2017-08-15

申请号：US14285770

申请日：2014-05-23

申请人： iPosi, Inc.

发明人： Eric Derbez

IPC分类号： G01S19/09 ,  G01S19/13 ,  G01S19/03 ,  G01S19/20 ,  G01S19/23 ,  G01S19/51

CPC分类号： G01S19/13 ,  G01S19/03 ,  G01S19/14 ,  G01S19/20 ,  G01S19/23 ,  G01S19/235 ,  G01S19/246 ,  G01S19/51

摘要： An approach to joint processing of GNSS signals to determine a receiver location and common mode bias associated with grouped records corresponding to GNSS signals. In this regard, a receiver may acquire signals from a GNSS space vehicle over a relatively long period of time. In turn, records corresponding to received signals may be stored and grouped. The grouping of records may be based on assumptions of a common-mode bias for certain records (e.g., records acquired within a given duration of an observation time period). Upon acquisition of a suitable number of records, an over-determined system may be established that is used in iterative processing to solve for location and/or bias values associated with the respective common-mode bias for each group of records. As such, improved receiver performance may be realized.

公开(公告)号：US09551792B2

公开(公告)日：2017-01-24

申请号：US14157179

申请日：2014-01-16

申请人： MaxLinear, Inc.

发明人： Anand K. Anandakumar ,  Maxime LeClercq

IPC分类号： G01S19/29 ,  G01S19/24 ,  G01S19/37 ,  G01S19/30

CPC分类号： G01S19/24 ,  G01S19/246 ,  G01S19/29 ,  G01S19/30 ,  G01S19/37

摘要： A system and method for improving acquisition sensitivity and tracking performance of a GPS receiver using multiple antennas is provided. In an embodiment, the acquisition sensitivity can be improved by determining the correlation weight of each received path signal associated with one antenna from a plurality of antennas and then combining the path signals based on their respective correlation weight. In another embodiment, carrier offset correction information of each path signal is individually determined and then summed together to be used for tracking the code phase in a code phase tracking loop. The code phase tracking loop generates an early code and a late code that are used to determine the code phase error. The system includes digital adaptive filters to mitigate narrowband and broadband noises of a received GPS signal, wherein the digital adaptive filters are switched on periodically or by external events.

摘要翻译： 提供了一种用于提高使用多个天线的GPS接收机的采集灵敏度和跟踪性能的系统和方法。 在一个实施例中，可以通过确定与多个天线中的一个天线相关联的每个接收路径信号的相关权重，然后基于它们各自的相关权重组合路径信号来提高采集灵敏度。 在另一个实施例中，各路径信号的载波偏移校正信息被单独确定，然后相加在一起，以用于跟踪码相位跟踪环路中的码相位。 代码相位跟踪循环产生用于确定代码相位误差的早期代码和后期代码。 该系统包括数字自适应滤波器以减轻接收的GPS信号的窄带和宽带噪声，其中数字自适应滤波器周期性地或外部事件被接通。

公开(公告)号：US09194956B2

公开(公告)日：2015-11-24

申请号：US13346439

申请日：2012-01-09

申请人： James Digby Yarlett Collier ,  Tim Newton ,  Per-Ludvig Normark ,  Thomas Renstrom

发明人： James Digby Yarlett Collier ,  Tim Newton ,  Per-Ludvig Normark ,  Thomas Renstrom

IPC分类号： G01S19/23 ,  G01S19/24 ,  G01S19/37 ,  G01S19/29 ,  G01S19/30

CPC分类号： G01S19/235 ,  G01S19/243 ,  G01S19/246 ,  G01S19/29 ,  G01S19/30 ,  G01S19/37

摘要： A radio communications device includes a location finder for determining the device's location based on satellite signals, a crystal oscillator whose output frequency acts as a controlling reference for the location finder and a processor for intermittently correcting the crystal oscillator such that the output frequency experiences jumps. The location finder is arranged to take account of the jumps in the determination of the device's location.

摘要翻译： 无线电通信装置包括用于基于卫星信号确定设备位置的定位器，其输出频率用作定位器的控制基准的晶体振荡器和用于间歇地校正晶体振荡器使得输出频率经历跳跃的处理器。 位置查找器被安排为考虑设备位置的确定中的跳跃。

公开(公告)号：US09176232B2

公开(公告)日：2015-11-03

申请号：US13341852

申请日：2011-12-30

申请人： Gary Lennen

发明人： Gary Lennen

IPC分类号： G01S19/24 ,  G01S19/37 ,  G01S19/21

CPC分类号： G01S19/246 ,  G01S19/21 ,  G01S19/37

摘要： The present invention is related to location positioning systems, and more particularly, to a method and apparatus for making accuracy improvements to a GPS receiver's navigation calculations. According to a first aspect, the invention provides an extreme sensitivity GNSS tracking architecture. According to other aspects, the architecture includes multiple loops per channel, with the loops implemented with hardware and/or software. According to still further aspects, the architecture includes a multi-level lock detection algorithm designed to provide a trade-off between sensitivity and speed that is not possible with existing tracking architectures.

摘要翻译： 本发明涉及位置定位系统，更具体地，涉及一种用于对GPS接收机的导航计算进行精度改进的方法和装置。 根据第一方面，本发明提供了一种极灵敏度的GNSS跟踪架构。 根据其他方面，该架构包括每个通道的多个循环，循环通过硬件和/或软件实现。 根据另外的方面，该架构包括多级锁定检测算法，其被设计为提供在现有跟踪架构中不可能的灵敏度和速度之间的权衡。

公开(公告)号：US20150204982A1

公开(公告)日：2015-07-23

申请号：US14053225

申请日：2013-10-14

申请人： Farrokh Farrokhi

发明人： Farrokh Farrokhi

IPC分类号： G01S19/36 ,  G01S19/23

CPC分类号： G01S19/246

摘要： A satellite-based positioning system (SPS) signal processing technique re-samples a received series of PRN sequences from an SPS satellite to align them with a nominal sampling rate for a corresponding series of perfect reference PRN replica sequences.

摘要翻译： 基于卫星的定位系统（SPS）信号处理技术从SPS卫星重新采样接收到的一系列PRN序列，使其与对应的一系列完美参考PRN副本序列的标称采样率对齐。

公开(公告)号：US20150015438A1

公开(公告)日：2015-01-15

申请号：US14037052

申请日：2013-09-25

申请人： Texas Instruments Incorporated

发明人： Karthik SUBBURAJ ,  Karthik Ramasubramanian ,  Jawaharlal Tangudu

IPC分类号： G01S19/24

CPC分类号： G01S19/24 ,  G01S19/246 ,  G01S19/25

摘要： A method of acquiring a satellite signal in a GNSS receiver includes multiplying a received signal with a hypothesized doppler frequency signal to generate a frequency shifted signal. A PN code sequence signal is multiplied with the frequency shifted signal to generate a PN wiped signal. A windowing function signal is multiplied with the PN wiped signal to generate a windowed signal. The windowed signal is integrated coherently for a first predefined time to generate a coherent accumulated data.

摘要翻译： 在GNSS接收机中获取卫星信号的方法包括将接收信号与假设的多普勒频率信号相乘以产生频移信号。 PN码序列信号与频移信号相乘以产生PN擦除信号。 加窗功能信号与PN擦除信号相乘以产生加窗信号。 窗口信号被相干地整合在第一预定义时间以产生相干累积数据。

公开(公告)号：US08855241B2

公开(公告)日：2014-10-07

申请号：US13053213

申请日：2011-03-22

申请人： Yuan-Wen Ting

发明人： Yuan-Wen Ting

IPC分类号： H03K9/00 ,  H04L27/06 ,  G01S19/24 ,  G01S19/21

CPC分类号： H04L27/06 ,  G01S19/21 ,  G01S19/243 ,  G01S19/246

摘要： An apparatus for decoding GNSS navigation data to generate at least a target string or subframe includes a demodulator and a processing unit. The demodulator is utilized for demodulating a received signal to generate at least a plurality of strings or subframes having a same string index or subframe index.The processing unit is coupled to the demodulator, and is utilized for determining the target string or subframe according to the plurality of strings or subframes.

摘要翻译： 用于解码GNSS导航数据以生成至少目标串或子帧的装置包括解调器和处理单元。 解调器用于解调接收信号以产生具有相同字符串索引或子帧索引的至少多个字符串或子帧。 处理单元耦合到解调器，并且用于根据多个串或子帧来确定目标串或子帧。

公开(公告)号：US08855171B2

公开(公告)日：2014-10-07

申请号：US13207293

申请日：2011-08-10

申请人： Chih-Yuan Chu ,  Hao Zhou ,  Hao-Jen Cheng ,  Qinfang Sun

发明人： Chih-Yuan Chu ,  Hao Zhou ,  Hao-Jen Cheng ,  Qinfang Sun

IPC分类号： H04B1/00 ,  G01S19/24

CPC分类号： G01S19/246

摘要： A technique for reducing the dwell time in acquiring a satellite signal is provided. The technique minimizes the dwell time in searching for a satellite signal in cells of a search space by comparing the peak-power-to-average ratio (PAPR) to one or more thresholds at one or more intermediate points during the search in a code phase/Doppler frequency bin. The comparison is then used to determine whether to continue the search in a current code phase/Doppler frequency bin or to continue to the next code phase/Doppler frequency bin.

摘要翻译： 提供了一种用于减少获取卫星信号的驻留时间的技术。 该技术通过将峰值功率平均比（PAPR）与编码阶段的搜索期间的一个或多个中间点处的一个或多个阈值进行比较来最小化在搜索空间的单元中搜索卫星信号的停留时间 /多普勒频率仓。 然后比较用于确定是否在当前码相位/多普勒频率仓中继续搜索，或者继续到下一个码相位/多普勒频率仓。