The Applied Research Of Adaptive Frequency Hopping Technology In Communication

Electronic warfare cannot be ignored in modern warfare, and communication confrontation isan important branch, it plays an important role in command, control, computers and informationcommunication. Communication confrontation now has become the key to defeat the enemy, in asense， communication confrontation is a non-negligible combat. Hopping communicationtechnology is currently one of the most effective technology used in tactical communications. Thetechnology of adaptive frequency hopping communication system is the adaptive controltechnology and channel quality assessment technology with the combination of technology, it canmake the frequency hopping communication system using frequency is interference with goodfrequency point to replace the bad points, and through adaptive contro l, make its launch withminimal power, while maintaining high quality communication, on the basis of meet minimumprobability of being intercepted. It is originated from the advantages of military communication iswidely used in the adaptive frequency hopping technology.Firstly, the key algorithms currently implemented adaptive frequency hoppingcommunication system was studied in this paper: real-time channel estimation algorithm andadaptive control algorithm. Channel quality assessment algorithm based on kalman predictionwithout a large amount of prior knowledge, algorithm is simple, for a variety of modulation methodhas high accuracy, the signal-to-noise ratio of the prediction error is less than1dB. This paperproposes an adaptive multi-band digital modulation (MFSK) based control technology can make thesystem bit error rate of102, compared to non-adaptive get3dB power gain; compared toadaptive modulation get2dB power gain; compared to adaptive power control with get1dB powergain. The more frequencies, the effect is more obvious.Second, the existing conclusion anti-interference, basic it is against the principle of a certainkind of jamming or its anti-jamming method. In this paper, the influence of frequency hoppingcommunication system more serious tracking interference, blocking interference and otherinterference type has carried on the comparative study. Simulink analysis shows that the frequencyhopping communication system based on adaptive control in combating interference moreadvantages than ordinary frequency hopping communication system, improve the speed offrequency hopping, not only can greatly improve the forwarding interference, tracking the impact of interference on the system, but also does not affect the frequency hopping communication systemoriginal against single frequency interference and multipath interference such as anti-jammingperformance. In addition, this research also shows real-time jump speed change system of variablespeed adaptive frequency hopping communication system, applying the specific interference in ourhas yet to detect enemy type, use within the scope of the threshold velocity can be improved bymeans of method, improve the transmission performance of system. Simulation results show that in200/s to2000/s within the scope of speed can be improved, not only can the system facingforward tracking mode interference, interference of transmission error rate increased from3to4%;Can also make the system in the face of multi-tone interference, partial band interference andblockage interference types, transmission error rate increased from1to2%; In the face of theconventional interference such as single tone interference and multipath interference, also won’treduce the system anti-interference performance of the original.