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1.发明公开公开(公告)号：US20240288587A1
公开(公告)日：2024-08-29
申请号：US18115458
申请日：2023-02-28
Applicant: NovAtel Inc.
Inventor： Michael Bobye
Abstract: Techniques are provided for analyzing multiple filters in a solution domain to identify filter instability. A processor may compute, for each filter, a residual value for each of one or more update types utilizing misclosure values that correspond to the update type and are from a rolling history. The processor may compute a ratio value from the residual values computed for the same update type and across two different filters. The ratio value may indicate which filter is experiencing a larger magnitude of difference between two solutions utilized to generate a combined solution. The processor may compare the ratio value, over a time period, with one or more threshold values to identify at least one unstable filter. In response, the processor may take one or more actions, e.g., using the solution from a stable filter instead of the unstable filter, re-initializing the unstable filter using the stable filter, etc.
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公开(公告)号：US11921223B2
公开(公告)日：2024-03-05
申请号：US17944433
申请日：2022-09-14
Applicant: NovAtel Inc.
Inventor： Ali Broumandan
CPC classification number: G01S19/215 , G01S19/29 , G01S19/44 , G06F17/18
Abstract: A system and method for detecting spoofing of a Global Navigation Satellite System (GNSS) system using a plurality of antennas. Signals received by at least two of the plurality of antennas are authentication by use of one or more of a carrier phase authentication procedure, a signal power authentication procedure, and/or a channel distortion authentication procedure.
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公开(公告)号：US11906633B2
公开(公告)日：2024-02-20
申请号：US17522382
申请日：2021-11-09
Applicant: NovAtel Inc.
Inventor： Ali Broumandan , Thomas Taylor
CPC classification number: G01S19/215 , G01S19/29
Abstract: A system and method for detecting spoofing of a navigation system (NS) using a plurality of antennas. Carrier phase and CN0 measurements are obtains of a plurality of signals. The measurements are then double differenced and compared to predefined thresholds to determine whether a signal is authentic or not. Once sufficient authentic signals are identified, position and time is determined using the authenticated signals. Residuals are estimated for all signals. An average value of the residuals or the authenticated signals is calculated and is then removed from the residuals of the unauthenticated signals. Should the remainder exceed a predefined threshold, the signal is deemed to be spoofed. Otherwise, the signal is deemed to be authentic.
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公开(公告)号：US20230176230A1
公开(公告)日：2023-06-08
申请号：US17543002
申请日：2021-12-06
Applicant: NovAtel Inc.
Inventor： David A. Brown , Patrick C. Fenton
Abstract: An integrated GNSS signal having a plurality of signal components with arbitrary power allocation may be processed. In an embodiment, an integrated signal processing unit of a GNSS receiver may generate in parallel complex rotated samples for a sample of the integrated signal. The complex rotated samples (e.g., early and late complex rotated samples) may be accumulated in parallel in a window that spans any arbitrary width that is less than or equal to a number of code chips in a PRN code sequence. In an embodiment, the integrated signal processing unit may sequentially generate complex rotated samples for the sample. The complex rotated samples (e.g., early, punctual, and late complex rotated samples) may be sequentially accumulated in the window. The GNSS receiver may utilize the accumulated complex rotated samples to perform correlation techniques, perform multipath mitigation techniques, and/or track the integrated signal.
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5.发明公开公开(公告)号：US20230142516A1
公开(公告)日：2023-05-11
申请号：US17522382
申请日：2021-11-09
Applicant: NovAtel Inc.
Inventor： Ali Broumandan , Thomas Taylor
CPC classification number: G01S19/215 , G01S19/29
Abstract: A system and method for detecting spoofing of a navigation system (NS) using a plurality of antennas. Carrier phase and CN0 measurements are obtains of a plurality of signals. The measurements are then double differenced and compared to predefined thresholds to determine whether a signal is authentic or not. Once sufficient authentic signals are identified, position and time is determined using the authenticated signals. Residuals are estimated for all signals. An average value of the residuals or the authenticated signals is calculated and is then removed from the residuals of the unauthenticated signals. Should the remainder exceed a predefined threshold, the signal is deemed to be spoofed. Otherwise, the signal is deemed to be authentic.
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Patent Agency Ranking
公开(公告)号：US11573330B2
公开(公告)日：2023-02-07
申请号：US17166371
申请日：2021-02-03
Applicant: NovAtel Inc.
Inventor： Ali Broumandan
Abstract: A system and method for detecting spoofing of global navigation satellite system (GNSS) signals using a single antenna is provided.
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公开(公告)号：US11525925B2
公开(公告)日：2022-12-13
申请号：US16864904
申请日：2020-05-01
Applicant: NovAtel Inc.
Inventor： Ali Broumandan
Abstract: A system and method for detecting spoofing of a Global Navigation Satellite System (GNSS) system using a plurality of antennas. Signals received by at least two of the plurality of antennas are authentication by use of one or more of a carrier phase authentication procedure, a signal power authentication procedure, and/or a channel distortion authentication procedure.
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公开(公告)号：US20210257737A1
公开(公告)日：2021-08-19
申请号：US17235639
申请日：2021-04-20
Applicant: NovAtel Inc.
Inventor： Ning Yang
Abstract: A GNSS RHCP stacked patch antenna with wide dual band, high efficiency and small size is made of a molded high-permittivity material, such as ceramics, with a patterned cavity in the dielectric substrate. The perforated cavities in the substrate reduce the effective dielectric constant, increase the bandwidth and efficiency. The high-order modes can be manipulated through the design of cavities.
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公开(公告)号：US10754044B2
公开(公告)日：2020-08-25
申请号：US15961263
申请日：2018-04-24
Applicant: NovAtel Inc.
Inventor： Darrell James Anklovitch
Abstract: An antenna enclosure includes a sensor and a Global Navigation Satellite System (GNSS) antenna. Within the antenna enclosure, sensor data is combined with GNSS information to produce a RF communication signal, wherein the sensor data is out-of-band from the GNSS information. The RF communication signal is transmitted utilizing a GNSS antenna data link to a receiver side. On the receiver side, the RF communication signal is split into a GNSS RF path and a sensor RF path. The GNSS signals are transmitted to the GNSS receiver via the GNSS RF path. A sensor RF communication signal is de-modulated, and the sensor data is transmitted to the GNSS receiver. When the GNSS antenna data link is bi-directional, information may be transmitted from the GNSS receiver to the antenna enclosure via the GNSS antenna data link.
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公开(公告)号：US10715207B2
公开(公告)日：2020-07-14
申请号：US16725234
申请日：2019-12-23
Applicant: NovAtel Inc.
Inventor： David Brown , Patrick C. Fenton
IPC: H04B1/709
Abstract: A Global Navigation Satellite System (GNSS) receiver demodulates code shift keying (CSK) data utilizing correlations with combinational pseudo-random noise (PRN) codes generated for different bit positions. The GNSS receiver receives a signal including a PRN code modulated by CSK to represent a symbol (i.e., CSK modulated symbol). The GNSS receiver maintains a plurality of receiver codes, each representing a different shift in chips to the PRN code. The GNSS receiver performs a chip-by-chip linear combination of a group of receiver codes for each bit position of the CSK modulated symbol. The GNSS receiver correlates the received signal with each combinational PRN code to produce a binary value that is the CSK modulated symbol.
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