US 12,105,177 B2
Assessment of position of motion trackers on a subject based on wireless communications
José Carlos Coelho Alves, Oporto (PT); Márcio Filipe Moutinho Colunas, Oporto (PT); Luís António Correia de Oliveira, Oporto (PT); Pedro Filipe Xavier Rodrigues, Oporto (PT); Pedro Miguel Simões Bastos Martins, Oporto (PT); Pedro Miguel Moreira de Sousa, Oporto (PT); and Virgílio António Ferro Bento, Oporto (PT)
Assigned to SWORD HEALTH, S.A., Oporto (PT)
Filed by SWORD Health S.A., Oporto (PT)
Filed on Jul. 2, 2021, as Appl. No. 17/366,664.
Claims priority of application No. 21398009 (EP), filed on Jul. 1, 2021.
Prior Publication US 2023/0003863 A1, Jan. 5, 2023
Int. Cl. G01S 11/04 (2006.01); G01P 15/00 (2006.01)
CPC G01S 11/04 (2013.01) [G01P 15/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A motion tracking system comprising:
(1) a plurality of trackers adapted to be arranged on a plurality of body members of a body of a person, each tracker comprising at least one inertial sensor and a plurality of tracker antennas arranged in an array, wherein each tracker of the plurality of trackers is configured to:
receive, from a computing device, one or more first data packets through each of at least a first tracker antenna and a second tracker antenna of the plurality of tracker antennas of each of a first tracker and a second tracker of the plurality of trackers, the first tracker antenna and the second tracker antenna being set apart by a distance, and
determine a first direction in which the computing device is relative to at least the first tracker and the second tracker by computing an angle of arrival of the one or more first data packets based on (i) a time of arrival of the one or more first data packets through each of the first tracker antenna and the second tracker antenna of the first and second tracker and (ii) a distance between the first tracker antenna and the second tracker antenna of the plurality of tracker antennas; and
(2) the computing device, wherein the computing device is configured to:
receive, from each tracker of the first tracker and second tracker, one or more second data packets comprising data indicative of the first direction of the first tracker and the second tracker,
determine, based on the data included in the one or more second data packets received from each tracker of the plurality of trackers, a second direction in which each tracker of the plurality of trackers is relative to one or more other trackers of the plurality of trackers,
determine, based on the first direction and the second direction determined for at least the first tracker and the second tracker, that positioning of at least the first tracker on a body member, of the plurality of body members, does not accord with a predetermined correspondence, the predetermined correspondence defining at least a first correspondence between the first tracker and a first body member of the plurality of body members and a second correspondence between the second tracker and a second body member of the plurality of body members,
identify, based on the determining that the positioning of at least the first tracker on the body member does not accord with the predetermined correspondence, that at least the first tracker is misplaced on the body of the person, and
modify at least one of the predetermined correspondence or an actual position of at least the first tracker based on the determining that the positioning of at least the first tracker on the body member does not accord with the predetermined correspondence and the identifying that at least the first tracker is misplaced on the body of the person.