Research On Jamming And Evaluation Of Air Defense And Anti-missile Radar

The local wars in recent years have fully proved that electronic countermeasures have become an important means of modern warfare.The air force played a leading role in the Middle East War,the Gulf War and Syrian conflict.The biggest threat facing the air force is the ground-based air defense missile system.How to cover the air force penetration with electronic countermeasures equipment effectively is an important research topic in the field of electronic countermeasures.The work of this paper includes two aspects.In the first aspect,the system structure of ground-based air defense anti-missile radar is studied,and each key module is modeled and simulated.In the second aspect,different types of interference signals are analyzed,those signals are added to the radar system to analyze the effects of interference.Reasearches and results in this thesis as follows: 1.The composition of the air defense and anti-missile radar system is analyzed.The air defense and anti-missile radar system model is established.The array antenna,signal pattern,especially the signal processing of pulse compression,MTD,MTI and constant false alarm are simulated and analyzed.Then aiming at the problem of target tracking in air defense radar,the data processing flow and target tracking algorithm are analyzed.2.A radar jamming signal model is established.Interference signals such as noise amplitude modulation interference,noise frequency modulation interference and noise phase modulation interference are generated.The working principle of deceptive interference is analyzed and the deceptive interference patterns such as distance false target deception jamming,distance gate dragging interference and speed towing interference are established.Finally,the interference model is analyzed and the corresponding simulation analysis is performed.3.Aiming at two different battlefield scenarios,the effect of jamming is analyzed from different angles.Firstly,the influence of jamming on radar effective detection distance is analyzed.By changing the attack route of penetrating aircraft(mainly the angle between penetrating aircraft and radar antenna lobe is different),the effective detection distance of anti-aircraft and anti-missile radar under different angles are analyzed and compared with the theoretical data.Secondly,the change rule of interference exposure area under distributed jamming is studied,and the distribution of safe attack channel in space of penetration aircraft under distributed jamming is given.Then based on the influence of interference on radar target tracking,the effects of interference signals on the target track are analyzed under the conditions of distance-to-swing towing interference and multi-false target interference.Finally,from the point of view of the influence of jamming on radar target detection,the influence of the number of false targets and the power of jamming signal(different interference-to-signal ratio)on detection threshold and radar detection probability is studied and analyzed in the case of multiple false targets jamming.