The Research Of RCS Reduction Technique Based On Van Atta Array

With the development of science and technology and the rise of modern warfare,different technical means are widely used in scenarios such as target location and radar stealth.Different antennas are used to achieve target tracking in electronic warfare.At the same time,the stealth performance of the antenna will be enhanced to reduce the risk of self-exposure.Radar cross section(RCS)is an important indicator of target stealth,which can be used to measure the possibility of target being detected by the enemy.The Van Atta can automatically radiate wave to the direction of the incoming wave,and the wave can be changed to control the RCS by adjusting the phase of array.In this paper,the phase cancellation is used to reduce gain of array at beam direction in order to reduce RCS.Since Van Atta array has retrodirective characteristics,the RCS reduction with a wide scan angle can be realized by designing van atta array with wide scan angle.Two kind of phase cancellation techniques are proposed to achieve great RCS reduction,and the advantages and existing problems of the two methods are discussed respectively.To realize RCS reduction of Van Atta array at wideband,phase shifter and optimization algorithms are used to help to accomplish phase cancellation.The main contents are as follows:Firstly,the research background and development history of RCS reduction technology,Van Atta array,optimization algorithms are introduced,and a brief overview is given combined with practical applications.Next,the radar cross section,scattering mechanism of the antenna,and the methods of directional backtracking array are introduced while the phase conjugation principle is analyzed,and the working process of the monostatic RCS and the bistatic RCS are deduced.Then,the working principle and specific execution process of the differential evolution algorithm are introduced,which lay the foundation for array optimization using differential evolution algorithm.Secondly,RCS reduction based on phase cancellation is introduced.The principle of phase cancellation of one-dimension array and two-dimensions array is analyzed,and the realization method of phase cancellation is introduced.The number of elements of array will affect phase cancellation while the array achieves phase cancellation by feeding the opposite phase.Then,a one-dimension Van Atta array with wide scan angle is designed to illustrate the feasibility of phase cancellation according to the result of simulation,and the influence of phase cancellation of array is analyzed.To achieve RCS reduction at wideband,a wideband two-dimensions Van Atta array is designed to realize phase cancellation at wideband combining with 180 deg wideband phase shifters,and the array is processed for physical testing.Finally,a novel phase cancellation technique called random phase cancellation is proposed in view of the problems existing in phase cancellation.The phase of array is optimized as independent variable according to differential evolution algorithm,and the phase cancellation of array is not affected by the number of elements of array.Then,the length of transmission lines of Van Atta array is optimized to reduce RCS at wideband,and onedimension van atta array and two-dimensions Van Atta array are designed to verify the result of RCS reduction by simulation.