CODE PHASE ERROR ESTIMATING METHOD, CODE PHASE CALCULATING METHOD, PROGRAM, CODE PHASE ERROR ESTIMATING DEVICE, AND CODE PHASE CALCULATING DEVICE

摘要

A code phase error estimating method includes: calculating correlation for I and Q components of a reception signal of a spread modulated positioning signal which is unique to each positioning satellite and a replica signal of the spread code; judging code phase based on the result of the correlation calculation; calculating a ratio between a first correlation value for a third correlation value and a second correlation value for the third correlation value, wherein the first correlation value being a correlation value at the code phase, the second correlation value being a correlation value at a phase shifted from the code phase by X chip (0X1), and the third correlation value being a correlation value at a phase shifted from the code phase by Y chip (1Y); and estimating the code phase error by using the ratio and an offset value of the ratio determined in advance for each of the spread codes when the reception signal is a multipath signal.