| At present,with the rapid development of radar technology,the weapon platform equipped with radar system is increasingly showing the ability of "inspection and integration" and "discovery and destruction".This powerful operational effectiveness greatly reduces the survivability of high-value military targets on the battlefield.How to effectively protect electronically high-value targets has become an important research direction in the field of electronic countermeasures.For the traditional large-scale active interference system,there are problems such as large radiation power,easy exposure,slow response,and vulnerability to attack.However,the new electromagnetic control surface passive interference has problems such as flexibility,directionality and insufficient energy.The Van Atta retro-reflective array introduces the field of electronic countermeasures to achieve targeted passive electronic protection.Based on the analysis of the electromagnetic backtracking principle of Van Atta array,two electromagnetic control methods,amplitude and phase,were proposed.The Van Atta array with adjustable amplitude and phase-controlled electronic control was designed.Both modulation methods can be effective.Control the electromagnetic scattering characteristics of the target,affect the radar detection and imaging,and improve the directional and energy problems of the electromagnetic control surface.The research on the electronically controlled Van Atta array includes the following aspects:First,this paper analyzes the phase conjugate principle and the direction backtracking condition of Van Atta direction back matrix,and then derives the field distribution of Van Atta line and plane array,and obtains the Van Atta line array and plane array.The single-station and dual-station radiation fields give a typical angular radiation field distribution map.The amplitude and phase weighted matrix factors of the two-station radiation field of the Van Atta array are derived theoretically.The single-station radiation field is the amplitude-weighted antenna directivity coefficient.Secondly,a planar Van Atta array is designed by using a microstrip series resonant antenna and a microstrip grounded coplanar waveguide transmission line.The CST simulation results in a design of the Van Atta array.Under the oblique incidence of plane wave,the RCS is higher than the equivalent plane metal.The board is more than10 dB and has better orientation backtracking characteristics.On this basis,the microstrip single-pole single-throw and double-throw switches are designed and applied to the designed Van Atta array for on-off regulation and phase regulation.Through the microwave darkroom test,the designed electronically controlled Van Atta array has better electromagnetic regulation characteristics.The third is the radar effect level.This paper studies the effects of two kinds of modulated electronically controlled Van Atta arrays on the constant false alarm detector and SAR imaging.Through research,it is found that Van Atta array on-off and phase regulation can effectively interfere with radar detection and imaging,and by controlling the modulation parameters,different interference effects can be generated,which also proves that the electronically controlled Van Atta array is a new interference technology.It has important application prospects in the field of electronic countermeasures. |
