US 11,719,781 B2
Location system
Satoshi Nakajima, Miyagi (JP); Satoshi Hayasaka, Miyagi (JP); and Yasuhiro Suzuki, Tokyo (JP)
Assigned to ALPS ALPINE CO., LTD., Tokyo (JP)
Filed by ALPS ALPINE CO., LTD., Tokyo (JP)
Filed on Mar. 7, 2022, as Appl. No. 17/653,709.
Application 17/653,709 is a continuation of application No. PCT/JP2020/029345, filed on Jul. 30, 2020.
Claims priority of application No. 2019-170673 (JP), filed on Sep. 19, 2019.
Prior Publication US 2022/0187412 A1, Jun. 16, 2022
Int. Cl. G01S 5/00 (2006.01); G01S 5/02 (2010.01); H04W 4/029 (2018.01); G01S 3/48 (2006.01)
CPC G01S 5/0268 (2013.01) [G01S 3/48 (2013.01); H04W 4/029 (2018.02)] 9 Claims
OG exemplary drawing
 
1. A location system comprising:
a first measurer configured to measure a first variable in accordance with a time of arrival of a radio wave and measure a first reception strength of the radio wave;
a second measurer apart from the first measurer and configured to measure a second variable in accordance with a time of arrival of a radio wave and a second reception strength of the radio wave;
a memory configured to store first data that associates a plurality of zones with a first reference variable and a second reference variable corresponding to times of arrivals of radio waves with respect to the first measurer and the second measurer for a case where the radio waves are transmitted from the plurality of zones, and second data that associates the plurality of zones with a first reference reception strength and a second reference reception strength with respect to the first measurer and the second measurer for the case where the radio waves are transmitted from the plurality of zones; and
a processor configured to identify from among the plurality of zones a zone that has a highest probability of including a position from where radio waves are transmitted, based on the first variable and second variable, the first reference variable and second reference variable, the first reception strength and second reception strength, and the first reference reception strength and second reference reception strength, using a predetermined identifying method.