Study On Radar Range Calculation In Jamming Environment

With the development of science and technology,all kinds of modern high-tech weapons are used in the battlefield.With the war becoming more and more complex,it has become an indispensable mean by accurate battlefield estimate and radar detection power assessment,which has an important impact on the war.On the basis of free space radar detection power model,this thesis discusses range evaluation method under blanket and false target jamming.This thesis first gives the method of estimating the range by Blake table and establishes simple model on the base of the radar equation.The type of target fluctuation is introduced on the basis of simple model,because the estimation of the range is based on the target.In this thesis,the range estimation model of different targets is proposed and the comparison and analysis of them are carried out.In the war,blanket jamming has an important factor on the radar range,it has a great power,greatly reduces the signal to noise radio,and then reduces the range of the radar.The thesis introduces the radar range equation under blanket jamming and analysis the influence of jamming sources number on the base of above principles.There are different anti-jamming measures in view of the existence of blanket jamming.This thesis first studies the improvement of range from the point of ECCM improvement factor.And then evaluates the influence of different anti-jamming measures on the range from the perspective of the gain of the receiving antenna pattern.Finally compare and analysis the improvement of the range by different anti-jamming measures under the same conditions.Another common interference in the actual working environment is false target jamming.The existence of false target jamming will raise the threshold of radar detection,and the signal to noise ratio required by the same detection probability becomes larger,then the range becomes shorter.Taking CA-CFAR detection as an example,this thesis first studies the detection performance loss and range loss caused by the existence of false target jamming,then discusses the relationship between the number of false targets,the radio of jamming to noise and loss of range.SO-CFAR and OS-CFAR can effectively reduce the masking effect of false target jamming.Therefore,the influence of SO-CFAR and OS-CFAF on the radar range is studied.When false target exists in the sidelobe,sidelobe cancellation will have a certain effect.Finally,this thesis discusses sidelobe cancellation performance of false target jamming from the number of samples and the auxiliary unit number.