公开(公告)号：US20220128677A1

公开(公告)日：2022-04-28

申请号：US17511433

申请日：2021-10-26

申请人： ZaiNar, Inc.

发明人： Mainak Chowdhury ,  Philip Adam Kratz ,  Jonathan Shiao-En Lu ,  Srdjan Miocinovic ,  Siamak Yousefi

IPC分类号： G01S13/08 ,  G01S7/02 ,  G01S7/03 ,  G01S7/285

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.

公开(公告)号：US11493619B2

公开(公告)日：2022-11-08

申请号：US17511433

申请日：2021-10-26

申请人： ZaiNar, Inc.

发明人： Mainak Chowdhury ,  Philip Adam Kratz ,  Jonathan Shiao-En Lu ,  Srdjan Miocinovic ,  Siamak Yousefi

IPC分类号： G01S13/08 ,  G01S7/02 ,  G01S7/03 ,  G01S7/285 ,  G01S13/00

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.