Standard Trajectory And Telemetry Data Altimetry Study

One most important problem in reentry telemetry is the action altitude measurement of aircraft system at low altitude. The traditional method is using the flying trajectory and telemetry time data to calculate the action altitude. But it is difficult to locate the trajectory at low altitude, so the action altitude cannot be gained.In this dissertation, an theory trajectory with the corresponding precision is found to determine the altitude-time relation. The analyzing results about the error also prove the feasibility of the method.The main contents in this dissertation are as follows:1 .A method using standard trajectory and telemetry action time data to calculate the action altitude is introduced, and some analyzing results about the error are given.2.The constitute principles of standard trajectory and reentry trajectory set are brief introduced, the design of analyzing program is given, and the detailed descriptions about the characteristics of reentry trajectory set are also given.3.The process of analyzing and simulating about the error is particular introduced, and the analyzing results are given.4.The improved methods using reentry trajectory set and rebuilding trajectory are also put forward.The analyzing and simulating results prove that using the measuring method in this dissertation can get the action altitude in reentry telemetry.