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摘要

PROBLEM TO BE SOLVED: To calculate the period of oscillation when an antenna is installed in such a position on a moving body as would cause its relative position to be varied by oscillation. ! SOLUTION: A GNSS signal is received with an antenna, and an attitude angle ΦB in the antenna position is calculated from the GNSS signal by a known method (S101). This processing to calculate the attitude angle ΦB is successively accomplished at prescribed time intervals Δt. Further, this processing to calculate the attitude angle ΦB is accomplished at least four times at different points of time. The calculated attitude angles ΦB are successively stored. From the attitude angles ΦB calculated and stored four times in this way and the time intervals Δt, an oscillation period T is estimated by using an estimating formula obtained by third-order functional approximation of the relative position variations of the antenna caused by oscillation (S102). ! COPYRIGHT: (C)2014,JPO&INPIT