Research On Anti-jamming Performance In Frequency Hopping Systems

In military communications, information confidentiality is very important, withconstant frequency carrier modulation, the enemy so long as have the same as the modulationfrequency carrier signal can transfer information, in order to avoid the enemy access to in theprocess of transmission signal, a lot of military communication for information transmissionapplication of frequency hopping communication system, so the anti-interference research offrequency hopping communication system has very important practical significance.Frequency hopping communication technology is taken to avoid the enemy access totransmit a kind of frequency hopping communication mode. Fh communication in workingfrequency is random variation in the process of transmission, at the receiving end, with thesender working frequency at the same time, the changing rule of the same frequencysynchronization signal, the frequency hopping signals can be solution, recovering theintermediate frequency signal; This is the frequency hopping communication system has highreliability, confidentiality good reason. In this case, the enemy to destroy their communicationwill be artificially to join the jamming signal, and the influence of different interference signalof the system is different, and different frequency hopping system anti-jamming performanceis also different. In military communication, will interfere with the enemy communicationsignals, and can make their own communication system anti-jamming, this is about toanti-jamming was studied for the frequency hopping communication system, so that canprotect their communications, jamming enemy communications.The simulation model of FH communication system is built on the Matlab/Simulinksoftware platform. The transmission environment is Gaussian white noise superimposedjamming environments. Gaussian white noise is a common noise in communication system;Human disturbance is interested in implementing the interference, Jamming signal includesbroadband obstruction interference, part of the band obstruction interference, comb blockinterference, multi-frequency continuous wave interference and track interference in thefrequency hopping system. This paper designs five interference signal models, the simulationof frequency hopping communication system is in white gaussian noise and five respectivelyinterference environment and obtains transmission performance, BER-SNR curve figures are presented under above jamming conditions as changing the parameters of the channel modeand making a detailed analysis various interference mechanisms, proposing several effectivemeasures to suppress the interference.