公开(公告)号：US20240385310A1

公开(公告)日：2024-11-21

申请号：US18661977

申请日：2024-05-13

Applicant: Stichting IMEC Nederland

Inventor： Amirashkan FARSAEI ,  Alireza SHEIKH ,  Jac ROMME

IPC: G01S13/84 ,  G01S7/35

Abstract: A method of phase-based ranging between a first device and a second device, comprises receiving a plurality two-way phase-measurements between the first device and the second device performed at a plurality of frequencies; identifying a first measurement and a second measurement of said plurality of two-way phase measurements, said first measurement and said second measurement having been performed at a same frequency; calculating a relative speed between said first device and said second device based at least on said first measurement and said second measurement; doppler compensating a plurality of measurements of said plurality of two-way phase measurements based on the calculated relative speed; and calculating a distance between said first device and said second device based on the doppler compensated measurements.

公开(公告)号：US20240377527A1

公开(公告)日：2024-11-14

申请号：US18658165

申请日：2024-05-08

Applicant: Stichting IMEC Nederland

Inventor： Amirashkan FARSAEI ,  Alireza SHEIKH ,  Jac ROMME

IPC: G01S13/84 ,  G01S13/32

Abstract: A method for estimating relative time offset and relative clock skew between a first radio transceiver and a second radio transceiver, said method comprising: receiving coarse information of the relative time offset and relative clock skew; receiving and transmitting signals at sequences of frequencies by switching of frequencies by the first radio transceiver in synchronization with a switching of frequency by the second radio transceiver, wherein switching of frequencies is performed by coherent frequency switching, and wherein sequences of frequencies include sub-sequences of increasing frequency values and decreasing frequency values, respectively, performing phase measurements for each frequency; determining weighted average phase difference values between sequential frequency values; and determining a fine estimate of the relative time offset and relative clock skew based on the weighted average phase difference values.