PHASE ERROR PRESUMPTION CONTROL METHOD OF GLOBAL MEASURING SYSTEM SYNCHRONOUS DEVICE WITH KALMAN FILTER

摘要

(s1) judging whether it is possible to track a satellite; (s2) judging whether the time is smaller than 1 us when the satellite is tracked; (s3) performing the Kalman filter estimation when the time is smaller than 1 us; (s4) judging whether the standard deviation is lower than 10-8, and tracking the satellite again when the standard deviation is higher than 10-8; (s5) controlling a voltage controlled crystal oscillator(VCXO) and tracking the satellite again when the standard deviation is lower than 10-8; (s6) removing the phase offset when the time of the step (s2) is larger than 1 us; and (s7) returning to the step (s2) by delaying the frequency where the offset is removed.