Anomaly Detecting Method of IGS Predicted Orbits in Near-Real-Time

摘要

PURPOSE: A semi-real time IGS(Internation GNSS Service) predicted orbits anomaly detecting method is provided to accurately measure the location of an object by not using a satellite signal obtained from a navigation satellite having abnormal orbits as data for determination. CONSTITUTION: Predicted orbits included in ultra rapid among orbits provided from an IGS orbits are obtained(S100). A NANU(Notice Advisories to NAVSTAR Users) is analyzed and an abnormal phase and abnormal time are found(S200). A satellite signal obtained from a satellite having an abnormal phenomenon is eliminated from data for determination(S300). Broadcast orbits provided from the IGS are obtained(S400). Predicted broadcast orbits are created using the broadcast orbits(S500). The predicted broadcast orbits and IGS predicted orbits are compared and anomaly of the IGS predicted orbits is detected(S600).