Research On Complicated Electromagnetic Environment And Its Applications For Launch Mission

Because of large numbers of electronic instruments are used in launch mission, the electromagnetic environment became more and more complex. Electromagnetic interference among the equipments exists in launch site and is unfavorable to launch mission. Even more launch mission may be frustrated because of electromagnetic interference. On the other hand, with the electro-war arisen electromagnetic safety in launch site is affected inevitably because of hostile electronic sense and electromagnetic interference from the overseas spy satellite. Also resulting in the spaceflight launch mission in our country is threatened seriously. But research on CEME (Complicated Electromagnetic Environmentin) in launch site is vacant at present. Thus research on CEME in launch mission is the purpose of this work. In detail, analysis and measurement of CEME in launch mission, modeling and simulation of CEME in launch mission, and test technique under CEME, are the main research topics. The contents are presents as follows:The radiant sub-systems and characteristics of CEME in launch mission are analyzed according to the technical characteristics of launch mission. Then, the theory and method to predict the EMC (Electro Magnetic Compatibility) in launch site are studied and the models for prediction are given. The dynamic measurement techniques of the electromagnetic environment in the launch site are discussed. The EMC measurement system in launch mission and the EMC experiment method are presented. And the viewpoint that the simulation should be used to complement the limitation of the real measurement is proposed.Based on the elements analysis of CEME in launch site, the simulation entities of CEME in launch missions are analyzed. The radar electromagnetic environment, signal coupling and noise jam are modeled using PDW (Pulse Describe Word). The mini-prototype of CEME launch test technology simulation system is designed based on HLA (High Level Architecture). The simulation scene refer to the real rocket launch test is designed and the launch test technology of launch site is simulated. The reliability of the data transport between satellites and ground terminals is another important issue in the TT&C (Tracking Telemetering&Command) of the launch site, constructs the space-ground telemetry, telecommand and communication links simulation model by the CCSDS (The Consultative Committee for Space Data Systems) AOS (Advanced Orbiting Systems) specification, and modifies the regular TCP (Transport Control Protocol) of the ground network using SCPS-TP (Space Communications Protocol Specification-Transport Protocol) SNACK (Selective Negative Acknowledgement) technology, makes it adapt to the space communication environment, and compares the throughput, data sending rate performance in high BER (Bit Error Rate) of them.Based on above results, countermeasures to carry out launch mission under CEME are studied. The characteristics of electromagnetic environment in test and launch process, measurement and control system are analyzed in detail. The countermeasures in command and control, test and launch, measurement and control based on PCM (Pulse Coded Modulation) and CCSDS AOS standard are put forward. The conceivableness to construct CEME in launch site is advanced to reply serious challenge of CEME. At present the research on CEME in launch mission should combined simulation and test.Accordingly how the CEME affects launch mission can be analyzed with simulation.