Study On Design Techniques Of Wireless Communication Anti-Jamming

Wireless communication anti-jamming technology is a key communication technology,the main purpose is to resist the interference of the external interference,so as to ensure that their signals in complex electromagnetic environment can still be normal transmission.At present,with the rapid development of communication technology,the application of high code rate information transmission is becoming more and more high.At present,most of the communication equipment can only provide 20³0dB anti interference tolerance,but in the complex electromagnetic environment,the need for more than 50dB of the interference tolerance.The traditional spread spectrum communication system can improve the anti-jamming ability of the system,but it will bring the problem of wide spectrum width and excessive transmission power.According to this challenge,mainly on the antenna array and high performance reconfigurable antenna design technology of machine anti interference.In this paper,we analyze a variety of anti jamming system and receiver architecture which are widely used in current communication system.Low intermediate frequency digital receiver architecture based on the switch matrix fast hopping frequency synthesizer,which adopts PIN control to achieve pattern reconfigurable antenna.These two structures enhance the system's frequency hopping speed and spatial scanning speed,in the frequency domain and space domain to enhance the system's ability to resist interference.For the transmission of high speed signal code interference with challenge,array antenna anti-jamming technology,through rational design of the multi-channel receiver,using RF amplitude phase adjusting network,channel calibration,system calibration and digital terminal.In the system,the system is in a state of sensitivity,the error rate is too far,and the anti-interference capacity is better than 60dB.The main innovations of this paper are as follows:1,Using RF,analog and digital integrated design method,design the architecture of a low frequency digital receiver,the 80MHz bandwidth of high dynamic and high linearity receiver amplitude and phase consistency,and increased the amplitude and phase regulation network in RF,and the receiver end network calibration.2,A frequency source structure based on the switch matrix is proposed,which can change the state of the input phase locked loop by controlling the switch matrix.The phase niose of this structure can be reach-155dBc@10kHz.The locked time can be reach 20?s.^{The locked time was shorten 60%than the traditional way of the phase} lock loop.3,Present a novel radiation pattern reconfigurable antenna that could operate in four directions without antenna servo system.This is achieved by changing the wave director and wave reflector via the PIN diodes.The reconfigurable antenna is incorporated within the four symmetrical wave detectors or wave reflectors to form the structure.and achieve the maximum in 5.08dB gain direction.