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With the development of satellite navigation technology,the users' demands for the integrity of GNSS are more and more intense.The ground based monitoring system can hardly report an alarm message to the GNSS users during the valid alarming period due to the satellite-earth propagation delay.It is beneficial to monitor the abnormal events and report the corresponding alarms in orbit.Through this way,which is an important branch of the future GNSS integrity monitoring,the time needed to give an alarm is shorter and the capability of system integrity service is strengthened.