Patent ID: 11924800
Assignee: SEIKO EPSON CORPORATION
Field: Measurement (Instruments)
Classification: CPC H  G  Y | IPC G  H

Claim 0:
1. A positioning system including a first mobile terminal and a second mobile terminal, the positioning system comprising:
each of the first mobile terminal and the second mobile terminal including:
a positioning device that performs positioning using a radio wave;
a communication device that has smaller power consumption than the positioning device, and that exchanges information with another mobile terminal using wireless communication; and
a battery that supplies power to the positioning device and the communication device, wherein

one of the first mobile terminal and the second mobile terminal performs positioning of a first current position,
the other of the first mobile terminal and the second terminal reduces to lower power to be used by the positioning device than power to be used by the positioning device of the one of the first mobile terminal and the second mobile terminal,
the other of the first mobile terminal and the second mobile terminal acquires the first current position from the one of the first mobile terminal and the second mobile terminal via the communication device, and the other of the first mobile terminal and the second mobile terminal sets the first current position to as a second current position when a relative positional relationship between the first mobile terminal and the second mobile terminal is within a predetermined range, and
the other of the first mobile terminal and the second mobile terminal sets the second current position based on the first current position and a distance from the first mobile terminal to the second mobile terminal, when the relative positional relationship between the first mobile terminal and the second mobile terminal is without the predetermined range,
wherein
the first mobile terminal performs positioning of the first current position
(i) when power consumption of the positioning device of the first mobile terminal is smaller than power consumption of the positioning device of the second mobile terminal, or
(ii) when positioning accuracy of the positioning device of the first mobile terminal is higher than positioning accuracy of the positioning device of the second mobile terminal.