Electronic device, time difference data acquisition method, and data structure for time difference data

摘要

An electronic device has a reception unit that can receive satellite signals transmitted from positioning information satellites and acquire positioning information and time information, a time difference data storage means in which a data table and a memory address table are stored, and a time difference data acquisition means that acquires time difference data corresponding to positioning information acquired by the reception unit from the time difference data storage means. The data table is compiled by dividing geographical information to which time difference data is assigned into segments of a constant size, setting only one time difference in each segment, grouping the segments into blocks each containing a specific number of segments, and storing the time difference data of each segment as block data by block unit while storing the block data only once for blocks containing the same time difference data array and storing the block data for mutually different time difference data arrays once each. The memory address table stores the memory address where the block data for each block is stored in the data table. The time difference data acquisition means identifies the block corresponding to the positioning information acquired by the reception unit, reads the memory address corresponding to said block from the memory address table, acquires the block data indicated by the memory address in the data table, and acquires the time difference data for the segment corresponding to the positioning information from said block data.