| 摘要 |
PROBLEM TO BE SOLVED: To track a signal with high precision without being affected by a W code diffused into L1 and L2 position measuring signals having different frequencies. SOLUTION: L1.P (Y) carrier wave compensation frequency, L1.P (Y) code compensation frequency, L2.P (Y) carrier wave compensation frequency of the L2 position measuring signal, and L2.P (Y) code compensation frequency are calculated based on frequency errors of L1.C/A carrier wave of the L1 position measuring signal. Frequency errors corresponding to each phase error of L1.P (Y) carrier wave and L1.P (Y) code of the L1 position measuring signal and L2.P (Y) carrier wave and L2.P (Y) code of the L2 position measuring signal, and the L1.P (Y) carrier wave compensation frequency, the L1.P (Y) code compensation frequency, the L2.P (Y) carrier wave compensation frequency, and the L2.P (Y) code compensation frequency which are calculated by a compensation frequency conversion and processing means are integrated at a timing interval based on a code unit of P code and are cleared repeatedly to follow the L1.P (Y) carrier wave, L1.P (Y) code, L2.P (Y) carrier wave, and L2.P (Y) code.
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