Technology Study On Modeling And Simulation Of Clutter And Jamming For Missile-borne-radar

Ground-sea clutter can have a serious effect on the radar detection of target,especially for the missile-borne-radar with phased array.Near-range ground clutter and sea clutter depend on the distance.During the subduction of the missile,the changes in clutter can be even more dramatic,so it is very important to strike a precise target that missile-borne-radar's clutter is simulated.Therefore,to improve the strike effect of attack weapon,ballistic missiles are usually guided precisly by SAR and single pulse.To improve the ability of the target to evade missiles and to survive in complex battlefield environments,it is very important to study much typical jamming.It is not only important for the test of radar performance,but also for the development of jamming and anti-jamming.Based on the actual engineering project,this thesis studies the clutter received by missileborne-radar with phased array.Firstly,the spatial geometry of the projectile radar is established.Then,the distance dependence of the near-range clutter is analyzed and the features of clutter is analyzed when the missile is subducted.Next,the clutter scattering unit is divided.The four kinds of clutter's amplitude spectrum and the three kinds of clutter's power spectrum for common terrain are simulated.Backscattering coefficient based on Morchin mode and atmospheric loss in various weather are calculated.At last,the clutter modulation function is constructed and the convolution of it with the radar transmitting signal is obtained.Based on the actual engineering project,this thesis studies the jamming received by missileborne-radar with phased array.Firstly,Strategy of chaff jamming based on the condition that the chaff cloud is mature,forming stable with a large radius and no covering between the strips is studied.Then the position of the chaff cloud center is calculated in detail.Finally,combined with the strategy the echo of chaff jamming in type of mass' s center and the echo of chaff jamming in type of diluter are reached.Secondly,the strategy of angle reflector jamming based on the condition that the rotating angle reflector is an eccentrically straight and dihedral angle reflector is studied.Then the angle reflector's RCS and the doppler frequency due to rotational motion calculated.Finally,combined with the strategy the echo of reflector jamming in type of fixation and the echo of reflector jamming in type of rotation are obtained.Thirdly,the model of deception jamming is studied.The echo of jamming in type of distance towing and the echo of jamming in type of speed towing are generated by simulation.Fourthly,the model of suppress jamming is studied.The echo of suppress jamming in type of blocking and the echo of suppress jamming in type of sweeping are generated by simulation.In this thesis,the performance of clutter and jamming is evaluated in single pulse mode that the signal of sum channel after radar's pulse compression in range,the results of distance measurement and the results of angle measurement are serious affected.In the band mode and cluster pattern of SAR imaging,the target imaging is serious affected.