Research And Performance Analysis On Retransmitted Jamming Technology Of Satellite Communication

The principle of retransmitted jamming technology of satellite communication isthe jamming receiver intercepts the downlink signal transmitted through the enemy’ssatellite transponder, and then the downlink signal intercepted plus the enemy’s uplinksignal are sent to the enemy’s satellite transponder, thus a closed jamming loop obtained.Because of the local frequency offset, the link delay and the superimposed power of thejamming signal and etc.of the closed jamming loop, the enemy’s normal communicationis effectively jammed by the jammer. Because of the importance of jamming technologyof satellite communication in the military war, researching on the performance ofjamming technology is significant.The frequency spectrum characteristic and the power spectrum characteristic of theretransmitted jamming signal, the different performance of different modulated signals(2PSK, QPSK,2FSK,16QAM) in the retransmitted jamming system, and how do thesystem parameters (local frequency difference, link delay, closed-loop gain,etc.)interferewith the performance of the system when satellite transponder is in the linear state aremainly researched in this thesis. Through the analysis of the principles of retransmittedsystem jamming, a mathematical model and the jamming simulation model are beenbuild respectively, the frequency spectrum, the power spectrum, etc. of differentmodulation signals are obtained. The analysis and simulation are made to verify thefeasibility of the retransmitted jamming technology, and the experimental results showthat the retransmitted jamming system has the greatest impact on the performance of16QAM signals,the performances of2FSK system is more vulnerable to the closed-loopgain, the performance of2PSK system is more vulnerable to the local frequencydifference and the performance of QPSK system is vulnerable to both parameters.