Study Of Jamming About Spread Spectrum TT&C System And Development Of Principle Prototype

The spacecraft Tracking Telemetry and Command (TT&C) system plays a veryimportant and special role in satellite communication. Spacecraft TT&C InformationNetworks are important equipment between the launching and running stages of thesatellite, which is used to monitor, manage and transport the communication data.Therefore, spacecraft TT&C system must have the ability of anti-jamming andAnti-interception. Combinatorial spread spectrum communication, which has animproved performance of anti-jamming, has leaded to the developing trend of spacecraftTT&C system. Frequency Hopping and Direct-sequence Spread-spectrum (FH/DS)communication mode is a typical representative of the combinatorial spread spectrumcommunication system, which is widely used in the field of communication. In order toevaluate the anti-jamming performance of spacecraft TT&C system based on the FH/DScommunication mode. So, the verification system has a very important militarysignificance. This dissertation focuses on the object is Spacecraft TT&C Systemanti-jamming performance verification, and has carried out the following work:(1) The research analyzes the performance indicators of the spacecraft TT&Csystem, and then designs the jamming equipment. The research paper analyzes thedrawbacks of the spacecraft TT&C system and finds some reconnaissance and jammingmethods. Based on those drawbacks, the research paper designs some relevant jammingmode and realizable method, and then formulates different strategies in differentapplication scenarios.(2) A reconfigurable hardware structure is used in the principle prototype jammer.Through the Graphical User Interface (GUI), the jammer could get the results ofreconnaissance and jamming signals for the uplink and downlink communicationsignals respectively. In a complex electromagnetic environment, the jammer couldintercept, sort and recognize the spacecraft TT&C signals. The jamming signals, such asWideband jamming, Single-frequency jamming, Narrowband jamming and Pulsejamming, which are generated by the principle prototype jammer, could jam theSpread-spectrum and Frequency Hopping communication signals. The general methods in the field of electronic countermeasures about reconnaissance, sort and jamming stylesare included in this research report. The jammer could simultaneously and/or alternatelygenerate the jamming signals for the uplink and downlink communication signals.