Patent ID: 8095148
Filing Date: 2012-01-10
Classification: H04W

Abstract:
1. A position information processing method using a communication apparatus capable of wireless communicating with a plurality of base stations, and an information recording apparatus capable of recording information matching an arbitrary position environment, the method comprising the steps of: measuring, at the communication apparatus, a signal intensity of a signal transmitted from each of the plurality of base stations; recording a history of signal intensity information at one or more times in a history storage medium of the communication apparatus, the history of signal intensity information including the measured signal intensity or information obtained from the measured signal intensity, base station identification information uniquely assigned to each of the base stations, and a time concerning measurement of the signal intensity, respectively correlated to each other; recording, in an information storage medium of the information recording apparatus, a specific time and information matching a position environment of the information recording apparatus at the specific time, respectively correlated to each other; calculating position information of the communication apparatus at the specific time based on the history of signal intensity information and known base station information, the history of signal intensity information being recorded in the history storage medium, and the known base station information being constituted of the base station identification information of the base stations and position information of the base stations correlated to each other, wherein the calculating step comprises the steps of: obtaining first position information calculated based on signal intensity information correlated to a first time nearest to the specific time and before the specific time; obtaining second position information calculated based on signal intensity information correlated to a second time nearest to the specific time and after the specific time; determining a weight coefficient for the first position information and the second position information, based on a ratio of a time from the first time to the second time to a time from the specific time to the second time; and calculating the position information of the communication apparatus at the specific time from the first position information and the second position information, by using the weight coefficient; and correlating the calculated position information to the information matching the position environment, the information matching the position environment being correlated to the specific time and stored in the information storage medium.