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    System and method for phase manipulation attack protection and detection in AoA and AoD
    102.
    发明授权
    System and method for phase manipulation attack protection and detection in AoA and AoD 有权

    公开(公告)号：US11700531B2

    公开(公告)日：2023-07-11

    申请号：US17094081

    申请日：2020-11-10

    申请人： Silicon Laboratories Inc.

    发明人： Esa Piirilä ,  Lauri Hintsala

    IPC分类号： H04W12/122 ,  H04W4/029 ,  G01S3/48 ,  H01Q3/36

    CPC分类号： H04W12/122 ,  G01S3/48 ,  H01Q3/36 ,  H04W4/029

    摘要： Systems and methods for detecting and protecting against phase manipulation during AoA or AoD operations are disclosed. For AoA operations, the network device receiving the constant tone extension (CTE) generates an antenna switching pattern, which may be randomly generated. The network device then receives the CTE using a plurality of antenna elements. In one embodiment, the network device compares the phase of portions of the CTE signal received that utilize the same antenna element. If the phase of these portions differs by more than a threshold, the network device detects a malicious attack and acts accordingly. In another embodiment, if the AoA algorithm cannot determine the angle of arrival, the network device detects a malicious attack and acts accordingly. For angle of departure operations, the network device that transmits the CTE signal generates the antenna switching pattern and transmits it to the position engine, which performs the comparisons described above.

    Systems and methods for detecting unmanned aerial vehicles via radio frequency analysis
    105.
    发明授权
    Systems and methods for detecting unmanned aerial vehicles via radio frequency analysis 有权

    公开(公告)号：US11585886B1

    公开(公告)日：2023-02-21

    申请号：US16261226

    申请日：2019-01-29

    申请人： Dedrone Holdings, Inc.

    发明人： Henning Meyer ,  Nico Otterbach ,  Kai Baumgart

    IPC分类号： G01S3/48 ,  G08G5/00 ,  G01S3/04 ,  H04B1/00

    摘要： Systems and methods for detecting radio frequency (“RF”) signals and corresponding origination locations are disclosed. An RF sensor device includes a software-defined radio and an antenna pair for receiving RF signals. Furthermore the RF sensor device may include a processing unit for processing/analyzing the RF signals, or the processing unit may be remote. The system calculates a phase difference between an RF signal received at two separate antennas of an antenna pair. The phase difference, the distance between the antennas, and the frequency of the RF signal are used for determining the origination direction of the RF signal. In various embodiments, the origination direction may indicate the location of a UAV controller or base station. The software-defined radio may include more than one antenna pair, connected to multiplexers, for efficiently scanning different frequencies by alternating active antenna pairs. Moreover, the system may execute packet-based processing on the RF signal data.

    TECHNIQUES TO DISAMBIGUATE ANGLE OF ARRIVAL
    106.
    发明申请
    TECHNIQUES TO DISAMBIGUATE ANGLE OF ARRIVAL 有权

    公开(公告)号：US20220390541A1

    公开(公告)日：2022-12-08

    申请号：US17339868

    申请日：2021-06-04

    申请人： APPLE INC.

    发明人： Qiang Chen ,  Robert W. Brumley

    IPC分类号： G01S3/48 ,  H01Q5/25 ,  G01S3/04 ,  G01S5/04

    摘要： In some aspects, a mobile device may receive, from a transmitting device, the signal by a plurality of antennas. The mobile device may measure one or more phase differences among the signal received at the plurality of antennas. The mobile device may determine a first set of possible values for the angle of arrival that are consistent with the one or more phase differences. The mobile device may measure one or more signal values using one or more sensors of the mobile device. The mobile device may for each of the first set of possible values, determining a confidence score based on the one or more signal values. The mobile device may select, based on the confidence scores, one of the first set of possible values as the angle of arrival.

    Method and apparatus for determining the angle of departure
    108.
    发明授权
    Method and apparatus for determining the angle of departure 有权

    公开(公告)号：US11422220B2

    公开(公告)日：2022-08-23

    申请号：US16903500

    申请日：2020-06-17

    申请人： DecaWave, Ltd.

    发明人： Michael McLaughlin ,  Jaroslaw Niewczas ,  Igor Dotlic ,  Billy Verso

    IPC分类号： G01S3/48 ,  H04B7/08 ,  G01S3/04

    摘要： An ultra-wideband (“UWB”) communication system comprising a transmitter having two transmit antennas and a receiver having a single receive antenna. Respective selected portions of the UWB signal are transmitted by the transmitter via each of transmit antennas is received at the receive antenna. By comparing the phases of the received signal portions, the phase difference of departure can be determined. From this phase difference and the known distance, d, between the transmit antennas, the Cartesian (x,y) location of the transmitter relative to the receiver can be directly determined.

    LOCATION SYSTEM
    109.
    发明申请
    LOCATION SYSTEM 有权

    公开(公告)号：US20220187412A1

    公开(公告)日：2022-06-16

    申请号：US17653709

    申请日：2022-03-07

    申请人： ALPS ALPINE CO., LTD.

    发明人： Satoshi NAKAJIMA ,  Satoshi HAYASAKA ,  Yasuhiro SUZUKI

    IPC分类号： G01S5/02 ,  G01S3/48 ,  H04W4/029

    摘要： The location system includes two measurers apart from each other and configured to measure first and second variables in accordance with times of arrival of radio waves and first reception strengths, respectively; a memory configured to store first data associating a plurality of zones with first and second reference variables corresponding to times of arrivals of radio waves with respect to the two measurers for a case where the radio waves are transmitted from the plurality of zones, and second data associating the plurality of zones with first and second reference reception strengths with respect to the two measurers for the case where the radio waves are transmitted from the plurality of zones; and a processor configured to identify from among the plurality of zones a zone having a highest probability of including a position from where radio waves are transmitted.

    Dynamic switch pattern selection for angle of arrival
    110.
    发明授权
    Dynamic switch pattern selection for angle of arrival 有权

    公开(公告)号：US11356158B2

    公开(公告)日：2022-06-07

    申请号：US16904942

    申请日：2020-06-18

    申请人： Silicon Laboratories Inc.

    发明人： Sauli Johannes Lehtimaki

    IPC分类号： G01S3/28 ,  G01S3/48 ,  H04B7/06 ,  H04W4/80 ,  H04B7/08

    摘要： A device and method for improving the accuracy of angle of arrival and departure computations is disclosed. The device and method rely on manipulation of the antenna switching pattern to achieve an improved calculation of arrival angle. In one embodiment, the device calculates an estimate angle of arrival using conventional methods. The device then determines which of a plurality of different antenna switching pattern yields the more accurate results at this estimated angle of arrival. The AoA measurement is then repeated using the preferred antenna switching pattern. In another embodiment, the device captures the amplitude and/or phase of the signal from each antenna element. The device then sorts these antenna elements and defines a preferred antenna switching pattern based on the sort list. The AoA measurement is then performed using the preferred antenna switching pattern. In another embodiment, neural networks may be utilized to determine the preferred antenna switching pattern.