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公开(公告)号：US20240259113A1
公开(公告)日：2024-08-01
申请号：US18561251
申请日：2021-05-19
发明人： Hiroyuki FUKUMOTO , Yosuke FUJINO , Toshimitsu TSUBAKI , Miharu OIWA , Yuya ITO , Marina NAKANO
摘要： According to an aspect of the present invention, there is provided a communication apparatus including: a synchronizer configured to perform synchronization processing according to a Doppler shift on a reception signal; and an equalizer configured to perform equalization processing on a reception signal on which the synchronization processing has been performed, in which the synchronizer includes a correlator configured to output a correlation between a reception signal and a known preamble sequence and a correlation between the reception signal and a known postamble sequence, a slide correlator configured to output a sliding correlation based on an output of the correlator, and a Doppler estimator configured to estimate a Doppler shift based on the sliding correlation of the slide correlator
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公开(公告)号：US12019154B2
公开(公告)日：2024-06-25
申请号：US16774866
申请日：2020-01-28
发明人： Jonathan C. Crowell
CPC分类号： G01S15/66 , G01S3/808 , G01S5/22 , H04B13/02 , H04W84/005
摘要： A system where a large number of underwater devices can transmit their precise position relative to a fixed underwater beacon, by transmitting two short duration, precisely timed acoustic tones (pings). The arrival time of the pulses at the fixed underwater transceiver beacon will relay the transmitter's precise position relative to that beacon. The two pings code for two numbers; either the range and bearing or an X, Y coordinate of each object with respect to the beacon. Data messages can be sent to and received from the beacon, used for command, control and status. The pulses can be a single frequency and have duration of around a 1 ms and operate one or many frequencies to allow multiple cycles to be overlapped in time. This coding scheme allows many devices to send the data simultaneously in the cycle for group tracking from last position or as independent cycles for unambiguous tracking. The transducers used in the system can be omni-directional hydrophones. The tracking grid size is a function of the acoustic frequency chosen and range from 1000 m for 40 KHz and 6000 m for 8 kHz. The system requires that all nodes in the system keep precise synchronized time.
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3.发明公开公开(公告)号：US20240090047A1
公开(公告)日：2024-03-14
申请号：US18450360
申请日：2023-08-15
申请人： Apple Inc.
摘要： This Application sets forth techniques for managing the cellular connectivity state of a submerged wireless device. The wireless device can include sensors that analyze environmental conditions to determine when the wireless device is (or is not) submerged underwater as well as at what depth the wireless device is submerged underwater. The sensors can also determine different types of aquatic activity in which a user of the wireless device is currently engaged, such as swimming, snorkeling, free diving, and scuba diving. In turn, the wireless device can utilize this information to manage its cellular connectivity state in order to avoid wasteful consumptions of energy. In particular, the techniques enable the submerged wireless device to eliminate any existing cellular connection as well as connection reattempts so long as they are unlikely to succeed. Moreover, the techniques enable the wireless device to execute connection reattempts when they are appropriate and likely to succeed.
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4.发明公开公开(公告)号：US20240048250A1
公开(公告)日：2024-02-08
申请号：US18266896
申请日：2020-12-16
发明人： Kazumitsu SAKAMOTO , Kento YOSHIZAWA , Takeshi KINOSHITA , Etsushi YAMAZAKI , Takayuki MIZUNO , Takuya OHARA
摘要： An aspect of the present invention is a wireless communication device including a water flow generator that controls a shape of a partial region on a water surface, and
an emission unit that emits a wave carrying information toward the region.-
公开(公告)号：US11866998B2
公开(公告)日：2024-01-09
申请号：US17109836
申请日：2020-12-02
发明人： Kenneth Miller , David Erdos , Abraham Erdos
摘要： In some embodiments, a system including a tool drill string having a downhole device is disclosed. The downhole device includes a memory storing instructions and a downhole processor configured to execute the instructions to operate in a first transmission mode by default. The downhole processor is communicatively coupled to an uphole processor via the first transmission mode. The downhole processor is further to transmit, via a second transmission mode, a message to the uphole processor, determine whether a response is received, via the second transmission mode, from the uphole processor, and responsive to determining the response is received from the uphole processor, switch from the first transmission mode to the second transmission mode.
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6.发明公开公开(公告)号：US20230327782A1
公开(公告)日：2023-10-12
申请号：US18158806
申请日：2023-01-24
发明人： Tatsuro UCHIDA , Masahiko NAKAZONO
CPC分类号： H04B13/02 , F15B19/00 , G01L1/2262
摘要： According to the present embodiment, a hydraulic device measurement apparatus comprises a first wireless communication portion, and a second wireless communication portion. A transmitter and a receiver of the first wireless communication portion are arranged along the rotation axis of the rotating portion, and a transmitter and a receiver of the second wireless communication portion are arranged in the air along the rotation axis. The first wireless communication portion and the second wireless communication portion transmit and receive the transfer signal along the rotation axis of the rotating portion.
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公开(公告)号：US11750299B2
公开(公告)日：2023-09-05
申请号：US17623008
申请日：2019-07-01
CPC分类号： H04B11/00 , H04B13/02 , H04L5/0048 , H04L5/0082 , H04L25/0202
摘要： A communication device includes a channel estimation unit configured to estimate an impulse response based on signals of sound waves received by each of a plurality of hydrophones, a long delay removal unit configured to remove a long-delay impulse response from the impulse response to generate a post-removal impulse response, a weighting factor calculation unit configured to calculate a weighting factor based on the post-removal impulse response, and a synthesizing unit configured to synthesize the signals received by each of the plurality of hydrophones based on the weighting factor.
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公开(公告)号：US11750027B2
公开(公告)日：2023-09-05
申请号：US17715335
申请日：2022-04-07
发明人： Boon Siew Ooi , Tien Khee Ng , Chun Hong Kang , Meiwei Kong , Yujian Guo
CPC分类号： H02J50/001 , F03B13/10 , H02J50/30 , H04B10/40 , H04B13/02
摘要： A free node to be deployed underwater for omnidirectional energy and data harvesting includes a housing that forms a sealed chamber; a wavelength-changing layer attached to an outside of the housing and configured to receive a first optical signal having a first wavelength range and to emit a second optical signal having a second wavelength range, different from the first wavelength range, wherein the first optical signal includes encoded data; a flexible solar cell wrapped around the housing, the flexible solar cell being configured to receive the second optical signal and generate an electrical signal; an energy storage module located in the chamber and configured to store electrical energy associated with the electrical signal; and a decoder located in the chamber and configured to receive the electrical signal and decode the encoded data. The first wavelength range is ultraviolet light and the second wavelength range is visible or infrared light.
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公开(公告)号：US11722228B2
公开(公告)日：2023-08-08
申请号：US14377377
申请日：2013-02-20
申请人： Tendeka B.V.
发明人： Bard Tinnen , Havar Sortveit
摘要： A method for use in controlling pressure based signal transmission within a fluid in a flowline includes transmitting a pressure based signal through a fluid within a flowline using a flow control device, recognising a condition change associated with the flowline, and then controlling the flow control device in accordance with the condition change. Another method, or an associated method for use in communication within a flowline includes determining or composing an optimised pressure based signal for detection at a remote location and then transmitting the optimised signal using a flow control device.
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10.发明公开公开(公告)号：US20230208465A1
公开(公告)日：2023-06-29
申请号：US17923370
申请日：2021-05-17
发明人： Koen Cornelis Hubertus BLOM , Paul Louis Maria Joseph VAN NEER , Mark Kevan PRIOR , Henry Simon DOL , Jan-Laurens Pieter Jacobus VAN DER STEEN
IPC分类号： H04B1/3827 , H04B13/02
摘要： A communication system (1) comprising a first and a second underwater wearable device to be worn by a swimmer at mutually distant locations is disclosed herein. The communication system is configured to derive information pertaining to the swimmer from properties of a version of the acoustic signal transmitted from a first communication module of the first underwater wearable device to a second communication module of the second underwater wearable device.
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