Anti-jamming Technology Research Of VHF Communication System Of The Civil Aviation Based On The Signal Characteristics

Nowadays,in the field of civil aviation,VHF air-ground communicationsinterference situation has always been a priority issue.Throughinvestigation and analysis,defined the main interference sources andtheir generation mechanism in order to propose an efficient algorithm forinterference studies.Introduced several anti-jamming algorithm brieflyand selected the appropriate algorithm for efficientsimulation.First,use the music (multiple signal classification)algorithm to estimate the direction of the signal and take the method offixed beam forming to form a high gain beams in the estimated DOA.Thenanalyzed the characteristics of output signal to determine theinterference signal.Simulation results show that the algorithm has a goodestimation performance, low complexity, easy to implement.Second,takethe steepest descent constant modulus algorithm to constantly update theweights and get the signal with a constant envelope in the arrayoutput,effectively extract the interference signal,achieve theanti-jamming purposes.Simulation results show that the algorithm has somelimitations, the simulation conditions are harsh,and it need improve toachieve better accuracy and stability.