The method of tracking filter of ballistic target is summarized. The key points， advantages and disadvantages of the extended Kalman filter （EKF）， conversion measurement Kalman filter （CMKF）， ballistic EKF （BEKF）， and ballistic unscented Kalman filter （BUKF） are analyzed. The efficacy of the four filtering methods is further verified using simulated ballistic data. The filtering precision， tracking performance of different filters for reentry target are compared and the effect of ballistic coefficient and measure error on filter performance is analyzed. The method of forming covariance of measure error is proposed， which improves adaptability and precision of filter. Several problems that should be considered when choosing and designing target tracking filter methods are proposed to provide reference and bases for the selection and desing of radar filtering methods.

In order to solve the growing pressure of large aircraft flight safety,a safety monitoring and training system of large aircraft was designed.Without affecting the original aircraft system,the data of the aircraft was collected.Combining the wireless communication,visualization and data processing technology,the data was shared with the ground facilities in real-time.In this way,the real-time sharing safety monitoring mechanism for flight and ground crew was set up.Based on data analysis,flight training and equipment health management system was built up,so as to promote the safety of large aircraft flight,the informatization of training,the intelligent of equipment maintenance.