US 12,241,957 B2
Method for distance determination
Jacobus Petrus Adrianus Romme, Schiedam (NL); Pepijn Boer, Vught (NL); and Lichen Yao, Enschede (NL)
Assigned to Stichting IMEC Nederland, Eindhoven (NL)
Appl. No. 17/757,340
Filed by Stichting IMEC Nederland, Eindhoven (NL)
PCT Filed Dec. 17, 2020, PCT No. PCT/EP2020/086842
§ 371(c)(1), (2) Date Jun. 14, 2022,
PCT Pub. No. WO2021/123032, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 19218751 (EP), filed on Dec. 20, 2019.
Prior Publication US 2023/0022613 A1, Jan. 26, 2023
Int. Cl. G01S 11/02 (2010.01); H04B 17/10 (2015.01); H04B 17/27 (2015.01)
CPC G01S 11/02 (2013.01) [H04B 17/101 (2015.01); H04B 17/27 (2015.01)] 20 Claims
OG exemplary drawing
 
1. A method for determining a distance between a first radio signal transceiver and a second radio signal transceiver, wherein the method comprises:
receiving a first set of measurement results and a second set of measurement results, wherein the first set of measurement results is acquired by the first radio signal transceiver based on signals transmitted from the second radio signal transceiver and the second set of measurement results is acquired by the second radio signal transceiver based on signals transmitted from the first radio signal transceiver, wherein the first set of measurement results is representable as comprising, for each of a plurality of frequencies, a measurement pair of a phase value and a signal strength value and the second set of measurement results is representable as comprising, for each of the plurality of frequencies, a phase value or a measurement pair of a phase value and a signal strength value;
calculating, for each frequency of the plurality of frequencies, a preliminary estimate of a value proportional to a one-way frequency domain channel response, wherein the plurality of frequencies do not exhibit phase coherency or timing coherency with one another, and wherein the preliminary estimate is based on:
the measurement results for the frequency from the first set of measurement results and the phase value; or
the measurement results for the frequency from the second set of measurement results;
calculating, for a frequency of the plurality of frequencies, a predicted estimate of a representation of the value proportional to the one-way frequency domain channel response, wherein the predicted estimate is based on one or more estimates for one or more respective frequencies adjacent to the frequency;
calculating a first metric distance between the predicted estimate for the frequency and a representation of the preliminary estimate for the frequency;
calculating a second metric distance between the predicted estimate for the frequency and a phase reversal of the representation of the preliminary estimate for the frequency;
determining, for the frequency, a final estimate of the value proportional to the one-way frequency domain channel response, wherein the final estimate is based on a comparison of the first metric distance and the second metric distance, and wherein the final estimate is either a phase reversal of the preliminary estimate or the preliminary estimate; and
determining the distance between the first radio signal transceiver and the second radio signal transceiver based on a plurality of such final estimates.