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公开(公告)号：US20240085547A1
公开(公告)日：2024-03-14
申请号：US18513332
申请日：2023-11-17
申请人： ZaiNar, Inc.
发明人： Babak Azimi-Sadjadi , David Burgess , Philip A. Kratz , Jonathan S. Lu , Raquel Guerreiro Machado , Srdjan Miocinovic , Jedidiah J. Whelan , Siamak Yousefi
CPC分类号： G01S13/08 , G01S7/0233 , G01S7/03 , G01S7/285
摘要： A method includes: receiving a ranging signal from the transmitter including a set of multiplexed sub-signals, each multiplexed sub-signal characterized by a frequency in a set of frequencies; calculating a sample-based time-of-arrival estimate based on the series of time-domain samples of the ranging signal; calculating a sample-based uncertainty of the sample-based time-of-arrival; for each sub-signal pair in a subset of multiplexed sub-signals of the set of multiplexed sub-signals, extracting a phase difference of the sub-signal pair; calculating a phase-based time-of-arrival estimate based on the phase difference of each sub-signal pair in the subset of multiplexed sub-signals; calculating a phase-based uncertainty of the phase-based time-of-arrival estimate; and calculating a hybrid time-of-arrival estimate as a weighted combination of the sample-based time-of-arrival estimate, the phase-based time-of-arrival estimate, based on the sample-based uncertainty and the phase-based uncertainty.
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公开(公告)号：US10911211B1
公开(公告)日：2021-02-02
申请号：US16588722
申请日：2019-09-30
申请人： ZaiNar, Inc.
IPC分类号： H04L7/00 , H04B17/309 , H04B17/21 , H04B17/11
摘要： A method includes, at a first node: transmitting a first calibration signal at a first time-of-departure measured by the first node; and transmitting a second calibration signal at a second time-of-departure measured by the first node. The method also includes, at a second node: receiving the first calibration signal at a first time-of-arrival measured by the second node; and receiving the second calibration signal at a second time-of-arrival measured by the second node. The method further includes: defining a first calibration point and a second calibration point in a set of calibration points, each calibration point comprising a time-of-departure and a time-of-arrival of each calibration signal; calculating a regression on the set of calibration points; and calculating a frequency offset between the first node and the second node based on the first regression.
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公开(公告)号：US20190356466A1
公开(公告)日：2019-11-21
申请号：US16405922
申请日：2019-05-07
申请人： ZaiNar, Inc.
摘要： A method includes, at a first node: transmitting a first synchronization signal at a first time according to a first clock of the first node; back-coupling the first synchronization signal to generate a first self-receive signal; calculating a time-of-arrival of the first self-receive signal according to the first clock; and calculating a time-of-arrival of the second synchronization signal according to the first clock. The method also includes, at the second node: transmitting the second synchronization signal at a second time according to a second clock of the second node; back-coupling the second synchronization signal to generate a second self-receive signal; calculating a time-of-arrival of the second self-receive signal according to the second clock; and calculating a time-of-arrival of the first synchronization signal according to the second clock. The method S100 further includes calculating a time bias and a propagation delay between the pair of nodes based on the time-of-arrivals.
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公开(公告)号：US11856483B2
公开(公告)日：2023-12-26
申请号：US17152719
申请日：2021-01-19
申请人： ZaiNar, Inc.
发明人： Philip A. Kratz , Daniel Jacker
IPC分类号： H04W4/029 , H04L27/22 , H04W56/00 , H04W4/02 , H04W64/00 , H04L67/53 , H04W84/18 , H04W84/12 , H04W4/33
CPC分类号： H04W4/029 , H04L27/22 , H04L67/53 , H04W4/02 , H04W56/002 , H04W64/00 , H04W4/33 , H04W84/12 , H04W84/18
摘要： A method of determining a reference clock in a mesh network includes receiving multiple signals, correlating the multiple signals with a local signal generated by the first node to determine a coarse set of time differences, refining the coarse set of time differences using a phase of a carrier signal of the multiple signals to produce a refined set of time differences, and using the refined set of time differences to define a reference clock.
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公开(公告)号：US11658798B1
公开(公告)日：2023-05-23
申请号：US17338543
申请日：2021-06-03
申请人： ZaiNar, Inc.
CPC分类号： H04L7/08 , H04L7/0016 , H04L7/041 , H04W64/003
摘要： A method includes: scheduling transmission of a first synchronization signal by a first node; and scheduling transmission of a second synchronization signal by a second node. The method also includes, after transmission of the first synchronization signal: receiving, from the first node, a first phase reference associated with the first synchronization signal; and receiving, from the second node, a first phase-of-arrival of the first synchronization signal at the second node. The method additionally includes, after transmission of the second synchronization signal: receiving, from the second node, a second phase reference associated with the second synchronization signal; and receiving, from the first node, a second phase-of-arrival of the second synchronization signal at the first node. The method further includes calculating a propagation delay between the first node and the second node based on the first phase reference, the second phase reference, the first phase-of-arrival, and the second phase-of-arrival.
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公开(公告)号：US20230077523A1
公开(公告)日：2023-03-16
申请号：US17958206
申请日：2022-09-30
申请人： ZaiNar, Inc.
摘要： A method includes: receiving a ranging signal from the transmitter comprising a set of multiplexed sub-signals, each multiplexed sub-signal characterized by a frequency in a set of frequencies; calculating a time-based time-of-arrival estimate based on the series of time-domain samples of the ranging signal; calculating a time-based uncertainty of the time-based time-of-arrival; for each sub-signal pair in a subset of multiplexed sub-signals of the set of multiplexed sub-signals, extracting a phase difference of the sub-signal pair; calculating a phase-based time-of-arrival estimate based on the phase difference of each sub-signal pair in the subset of multiplexed sub-signals; calculating a phase-based uncertainty of the phase-based time-of-arrival estimate; and calculating a hybrid time-of-arrival estimate as a weighted combination of the time-based time-of-arrival estimate, the phase-based time-of-arrival estimate, based on the time-based uncertainty and the phase-based uncertainty.
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公开(公告)号：US20230014896A1
公开(公告)日：2023-01-19
申请号：US17881449
申请日：2022-08-04
申请人： ZaiNar, Inc.
发明人： Jonathan Lu , Mainak Chowdhury , Philip A. Kratz
摘要： A method for calculating a time-of-arrival of a multicarrier uplink signal includes: accessing a multicarrier reference signal including a subcarrier reference signal for each subcarrier frequency in a set of subcarrier frequencies; receiving the multicarrier uplink signal transmitted from a user device, the multicarrier uplink signal including a subcarrier uplink signal for each subcarrier frequency in the set of subcarrier frequencies; for each subcarrier frequency in the set of subcarrier frequencies, calculating a phase difference, in a set of phase differences, between the subcarrier reference signal for the subcarrier frequency and a subcarrier uplink signal for the subcarrier frequency; calculating a time-of-arrival of the multicarrier uplink signal at the transceiver based on the set of adjusted phase differences; and transmitting the time-of-arrival of the multicarrier uplink signal to a remote server.
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公开(公告)号：US11445333B2
公开(公告)日：2022-09-13
申请号：US17379885
申请日：2021-07-19
申请人： ZaiNar, Inc.
发明人： Jonathan Lu , Mainak Chowdhury , Philip A. Kratz
摘要： A method for calculating a time-of-arrival of a multicarrier uplink signal includes: accessing a multicarrier reference signal including a subcarrier reference signal for each subcarrier frequency in a set of subcarrier frequencies; receiving the multicarrier uplink signal transmitted from a user device, the multicarrier uplink signal including a subcarrier uplink signal for each subcarrier frequency in the set of subcarrier frequencies; for each subcarrier frequency in the set of subcarrier frequencies, calculating a phase difference, in a set of phase differences, between the subcarrier reference signal for the subcarrier frequency and a subcarrier uplink signal for the subcarrier frequency; calculating a time-of-arrival of the multicarrier uplink signal at the transceiver based on the set of adjusted phase differences; and transmitting the time-of-arrival of the multicarrier uplink signal to a remote server.
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公开(公告)号：US11425536B2
公开(公告)日：2022-08-23
申请号：US17379873
申请日：2021-07-19
申请人： ZaiNar, Inc.
发明人： Jonathan Lu , Mainak Chowdhury , Philip A. Kratz
摘要： A method for calculating a time-of-arrival of a multicarrier uplink signal includes: accessing a multicarrier reference signal including a subcarrier reference signal for each subcarrier frequency in a set of subcarrier frequencies; receiving the multicarrier uplink signal transmitted from a user device, the multicarrier uplink signal including a subcarrier uplink signal for each subcarrier frequency in the set of subcarrier frequencies; for each subcarrier frequency in the set of subcarrier frequencies, calculating a phase difference, in a set of phase differences, between the subcarrier reference signal for the subcarrier frequency and a subcarrier uplink signal for the subcarrier frequency; calculating a time-of-arrival of the multicarrier uplink signal at the transceiver based on the set of adjusted phase differences; and transmitting the time-of-arrival of the multicarrier uplink signal to a remote server.
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公开(公告)号：US10455350B2
公开(公告)日：2019-10-22
申请号：US15644717
申请日：2017-07-07
申请人： ZaiNar, Inc.
发明人： Philip A. Kratz , Daniel Jacker
摘要： A method of determining a reference clock in a mesh network includes receiving multiple signals, correlating the multiple signals with a local signal generated by the first node to determine a coarse set of time differences, refining the coarse set of time differences using a phase of a carrier signal of the multiple signals to produce a refined set of time differences, and using the refined set of time differences to define a reference clock.
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