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    Dual-microphone adaptive filtering algorithm for collecting body sound signals and application thereof
    42.
    发明授权
    Dual-microphone adaptive filtering algorithm for collecting body sound signals and application thereof 有权

    公开(公告)号：US11735200B2

    公开(公告)日：2023-08-22

    申请号：US17282761

    申请日：2019-10-10

    Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY ,  FOSHAN BAIBUTI MEDICAL TECHNOLOGY CO., LTD.

    Inventor： Hongqiang Mo ,  Xiang Tian

    IPC: G10L21/0216 ,  A61B7/02 ,  H04R3/00 ,  H04R3/04

    CPC classification number: G10L21/0216 ,  A61B7/02 ,  H04R3/005 ,  H04R3/04 ,  G10L2021/02165

    Abstract: The present invention discloses a dual-microphone adaptive filtering algorithm for collecting body sound signals, characterized in that, using at least two microphones, a primary microphone and a secondary microphone, to collect signals; the primary microphone is used to collect noisy body sound signals, and the secondary microphone is used to collect environmental noise; applying a same high-pass filtering to signals collected by the primary microphone and signals collected by the secondary microphone; using a normalized least mean square algorithm on the primary microphone signals and the secondary microphone signals after the high-pass filtering to calculate a weight of the adaptive filter and to calculate an error signal to filter out environmental noise in the primary microphone signals; processing the error signal for a first time by a low-pass filtering to restore the body sound signals, to obtain the body sound signals output by the adaptive filtering algorithm. This algorithm not only may achieve rapid convergence of filter weights, but also avoid signal distortion, and suppress environmental noise interference quickly and reliably.

    Method for controlling steady flight of unmanned aircraft
    43.
    发明授权
    Method for controlling steady flight of unmanned aircraft 有权

    公开(公告)号：US11721219B2

    公开(公告)日：2023-08-08

    申请号：US16652457

    申请日：2018-10-26

    Applicant: South China University of Technology

    Inventor： Zhijun Zhang ,  Lu'nan Zheng ,  Dongyu Ji

    IPC: G08G5/00 ,  B64C39/02 ,  G05D1/08 ,  G05D1/00 ,  B64U30/20 ,  B64U101/00

    CPC classification number: G08G5/003 ,  B64C39/024 ,  G05D1/0088 ,  G05D1/0816 ,  B64U30/20 ,  B64U2101/00

    Abstract: Disclosed is a method for controlling stable flight of an unmanned aircraft, comprising the following steps: acquiring real-time flight operation data of the aircraft itself by means of an attitude sensor, a position sensor and an altitude sensor mounted to the unmanned aircraft, performing corresponding analysis on a kinematic problem of the aircraft by a processor mounted thereto, and establishing a dynamics model of the aircraft (S1); designing a controller of the unmanned aircraft according to a multi-layer zeroing neurodynamic method (S2); solving output control quantities of motors of the aircraft by the designed multi-layer zeroing neural network controller using the acquired real-time operation data of the aircraft and target attitude data (S3); and transferring solution results to a motor governor of the aircraft, and controlling powers of the motors according to a relationship between the control quantities solved by the controller and the powers of the motors of the multi-rotor unmanned aircraft, so as to control the motion of the unmanned aircraft (S4). Based on the multi-layer zeroing neurodynamic method, a correct solution to the problem can be approached rapidly, accurately and in real time, and a time-varying problem can be significantly solved.

    MULTI-BAND HYPERBOLIC FREQUENCY MODULATION SPREAD SPECTRUM COMMUNICATION METHOD BASED ON CROSS SUB-BAND DIVISION
    45.
    发明公开
    MULTI-BAND HYPERBOLIC FREQUENCY MODULATION SPREAD SPECTRUM COMMUNICATION METHOD BASED ON CROSS SUB-BAND DIVISION 审中-公开

    公开(公告)号：US20230239002A1

    公开(公告)日：2023-07-27

    申请号：US18009338

    申请日：2020-10-30

    Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

    Inventor： Hua YU ,  Yaqi ZHANG ,  Fei JI ,  Fangjiong CHEN

    IPC: H04B1/69

    CPC classification number: H04B1/69 ,  H04B13/02

    Abstract: The present invention discloses is a multi-band hyperbolic frequency modulation spread spectrum communication method based on cross sub-band division. In the present solution, multi-band division of different sub-band quantities is performed on an available bandwidth of an underwater acoustic system according to the parity of the serial number of the current spread spectrum period to achieve the aim of cross sub-band division. On this basis, a plurality of divided sub-bands are grouped in pairs; for each group, sub-band selection is performed according to different transmitted data by using a sub-band selection and activation method to realize multi-band parallel transmission. Meanwhile, in each spread spectrum period, an activated sub-band performs frequency modulation on a modulated signal by using rising and falling hyperbolic frequency modulation signals respectively.

    Shared-aperture dual-band dual-polarized antenna array and communication equipment
    46.
    发明授权
    Shared-aperture dual-band dual-polarized antenna array and communication equipment 有权

    公开(公告)号：US11710908B2

    公开(公告)日：2023-07-25

    申请号：US17557086

    申请日：2021-12-21

    Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

    Inventor： Yunfei Cao ,  Xiuyin Zhang ,  Quan Xue

    IPC: H01Q21/06 ,  H01Q9/04 ,  H01Q15/00 ,  H01Q5/392 ,  H01Q5/45 ,  H01Q1/52 ,  H01Q13/16

    CPC classification number: H01Q21/065 ,  H01Q1/523 ,  H01Q5/392 ,  H01Q5/45 ,  H01Q9/0414 ,  H01Q13/16 ,  H01Q15/0013 ,  H01Q15/0026 ,  H01Q15/0086

    Abstract: The invention discloses shared-aperture dual-band dual-polarized antenna array and communication equipment. The antenna array comprises a first dielectric substrate, a second dielectric substrate, a third dielectric substrate, a fourth dielectric substrate, and a fifth dielectric substrate. The first dielectric substrate, the second dielectric substrate, and the third dielectric substrate constitute a dielectric substrate group. The dielectric substrate group is provided with a low-frequency antenna element and four high-frequency antenna elements. The low-frequency antenna element is loaded with a filtering structure. The low-frequency antenna element and the high-frequency antenna element are fed by coaxial lines. The fourth dielectric substrate and the fifth dielectric substrate form a dual-function metasurface. When the dual-function metasurface is used as an artificial magnetic conductor reflector, the radiation of the low-frequency antenna element is enhanced in a low profile, and when used as a frequency selective surface, the electromagnetic scattering of the low-frequency antenna element in the high-frequency band is suppressed. Compared with the existing solutions, the present invention is more compact, and maintains high cross-band isolation and stable radiation patterns in dual bands.

    METHOD FOR PRODUCING BLOCK COPOLYMER COMPRISING CYCLIC ESTER AND EPOXY MONOMERS ARRANGED IN CONTROLLABLE SEQUENCE
    48.
    发明公开
    METHOD FOR PRODUCING BLOCK COPOLYMER COMPRISING CYCLIC ESTER AND EPOXY MONOMERS ARRANGED IN CONTROLLABLE SEQUENCE 审中-公开

    公开(公告)号：US20230212351A1

    公开(公告)日：2023-07-06

    申请号：US17641080

    申请日：2020-09-07

    Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

    Inventor： Junpeng ZHAO ,  Shan LIU ,  Guangzhao ZHANG

    IPC: C08G65/26

    CPC classification number: C08G65/2615 ,  C08G65/2654 ,  C08G2650/38

    Abstract: The invention provides a method for sequence controllable block copolymerization of a cyclic ester monomer and an epoxy monomer, including: in an inert atmosphere, adding the epoxy monomer and/or the cyclic ester monomer into a catalytic initiating system including an organic base and an alkyl borane for reaction, so as to obtain a sequence controllable polyether-polyester block copolymer of the cyclic ester monomer and the epoxy monomer, i.e. a polyester-b-polyether or a polyether-b-polyester. The invention can prepare various polyether-polyester block copolymers of which the molecular weights, block sequences, block ratios and pendant group combinations can be flexibly adjusted. The invention provides a method for continuously preparing an aliphatic polyester-polyether block copolymer by a one-pot method utilizing a catalytic system of a metal-free Lewis acid-base pair.

    Dynamic collision avoidance method for unmanned surface vessel based on route replanning
    50.
    发明授权
    Dynamic collision avoidance method for unmanned surface vessel based on route replanning 有权

    公开(公告)号：US11688285B2

    公开(公告)日：2023-06-27

    申请号：US17620755

    申请日：2019-10-31

    Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

    Inventor： Xiaobin Hong ,  Kuncai Zhu ,  Xinyong Wei

    IPC: G01S5/02 ,  G08G3/02 ,  B63B79/10 ,  G01C21/00 ,  G01C21/16 ,  G01C21/20 ,  G01S19/42 ,  G05D1/02

    CPC classification number: G08G3/02 ,  B63B79/10 ,  G01C21/005 ,  G01C21/16 ,  G01C21/203 ,  G01S19/42 ,  G01S5/02 ,  G05D1/0206 ,  G05D2201/0207

    Abstract: Disclosed is a dynamic collision avoidance method for an unmanned surface vessel based on route replanning. The method comprises the following steps: acquiring navigation information and pose information of a neighboring ship of an unmanned vessel itself via a vessel-borne sensor; constructing a collision cone between the unmanned vessel and the neighboring ship; introducing a degree of uncertainty with respect to observing movement information of the neighboring ship and applying a layer of soft constraint to the collision cone; applying a speed and a heading limit range of the unmanned vessel; acquiring an ultimate candidate speed set; introducing a cost function to select an optimum collision avoidance speed; and performing an internal recycle of navigation simulation with the optimum collision avoidance speed to obtain a route replanning point for dynamic collision avoidance of the unmanned vessel. According to the present invention, a dynamic collision avoidance strategy of the unmanned surface vessel is output in form of route replanning to meet constraints of international regulations for preventing collisions at sea, and it is well adapted to manipulate and control the unmanned vessel itself, so that a dynamic collision avoidance requirement of the unmanned vessel is met.

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