Research On Chaff Jamming Method For Anti-ship Missile

Modern warfare is no longer a simple hot weapon confrontation.In a war,whoever has the initiative of information is closer to the final victory.Radar is the most important means of information collection in the battlefield.Therefore,how to jam the enemy’s radar or resist the enemy’s jamming to our radar becomes particularly important,and radar electronic countermeasure technology emerges as the times require.As an important means of radar electronic countermeasure,passive jamming has the advantages of simple operation,low cost,and the jamming is not affected by the radar system.It plays an extremely important role in modern war.It is the most important passive jamming equipment.The research on chaff is of great strategic significance.This thesis discusses chaff combat from two aspects.They are chaff operation method and chaff operation effect analysis.It can be divided into the following three parts.Firstly,the three characteristics of chaff are studied.Through the introduction and analysis of physical characteristics,the relationship between chaff shortening effect and radius,wavelength and other conditions is obtained,and the chaff specifications are further determined.Through the introduction and analysis of motion characteristics,the motion and diffusion of a single chaff are modeled and simulated,and further extended to chaff cloud.From the two directions of radar antenna receiving power and chaff radiation field,the expression method of maximum RCS of chaff is obtained and further extended to the calculation formula of average RCS.The shielding effect of chaff is understood,and the echo signal is simulated and analyzed to verify the characteristics of the signal.Secondly,around the chaff centroid jamming,chaff dilution jamming and chaff screen jamming,this paper analyzes their specific implementation methods and influencing factors of combat effect from the aspects of principle,modeling and simulation.For the chaff centroid jamming,the relationship between the operational effect and the maneuver direction,the launching direction,wind direction and wind speed is analyzed through the control variables.For the chaff dilution jamming,the parameters of the terminal guidance radar related to the dilution jamming effect are analyzed,and an improved idea for the traditional chaff layout mode is proposed and its effect is verified;for the chaff screen,the relationship between the operational effect and the firing direction of the chaff projectile,wind direction and wind speed is analyzed;for the chaff dilution jamming,the paper analyzes the terminal guidance radar parameters related to the dilution jamming effect,and according to the criterion of its success,proposes an improvement idea for the relationship between the jamming effect and some battlefield factors is analyzed.Finally,the analysis and evaluation of chaff combat effectiveness are discussed.From the electromagnetic wave attenuation and suppression coefficient,the expression of the influence of chaff on radar detection range is derived,and the conditions in the expression are analyzed and discussed.Then,the simulation analysis of combat effectiveness is carried out for the three typical combat methods mentioned above.For chaff centroid jamming,two metrics based on ship maneuvering direction and chaff launching direction are proposed and discussed.For the chaff dilution jamming,a quantitative method of combat effectiveness is proposed,and according to this quantitative method,the layout improvement scheme is analyzed.For chaff screen jamming,the conditions of chaff jamming success are supplemented and simulated.At the same time,according to the complete judgment conditions,this thesis analyzes how to ensure the success of the operation by adjusting the deflection angle and maneuver direction of chaff curtain when the wind direction and missile attack direction are determined,and analyzes the operation effect according to the missile target distance at the end of the operation.