Research Of Anti-jamming Technology Based On SMART AGC

It has a strong anti-jamming capability for DSSS system combined with SMART AGC technique. The researches on its anti-jamming have a very important application in military. This thesis makes a thorough research on DS-SMART AGC system. The main contributions can be summarized as follows:Firstly, theory analysis and simulation are carried out about SMART AGC technique, including envelope detecting, filtering-tracking and settings of zero zones. Methods of implementation and exactly settings are fixed through simulation. Meanwhile, the DS-SMART AGC system mode is constructed with MATLAB.Secondly, under single tone jamming, multi tones jamming, linear frequency modulation, noise modulating frequency interference and on-off interference, the system performances are studied without considering noise. Simulation results show that DS-SMART AGC system has outstanding anti-interference performance, however, which is worse when the system is jammed by on-off interference with fast amplitude changing.Thirdly, the nonlinear property of SMART AGC system is studied. Simulation results show that SMART AGC has stronger nonlinear property. Making use of an improved robust distinguishing algorithm of Volterra system, generalized frequency responding function is given. And the anti-interference capability of DS-SMART AGC system, constructed with SystemView, is simulated. The results show that the anti-interference capability of DS-SMART AGC system is excellent.