Beam Synthesis And Target Detection Based On Programmable Metamaterial

Information metamaterial antenna is a new antenna system,which realizes the real-time control of electromagnetic waves by encoding and controlling the characteristics of each array element.Thus,real-time detection and analysis of targets can be realized.Compared with the conventional phased array antenna,the new antenna has the advantages of small size,low cost and flexible operation.It is a revolution in traditional phased array technology.In the field of radar target detection,a very important index is the flexible control of the beam by the antenna system.The information metamaterial antenna studied in this paper is based on coded reflective phase-shifting antenna.The beam synthesis principle of this antenna is similar to that of phased array,but due to the limitation of hardware,the phase value of each element is very limited.In this paper,the beam synthesis method of metamaterial antenna under this condition is studied,and its target detection performance is analyzed,which provides theoretical support for the application of this new antenna system.Firstly,the research status in this field is introduced,and the hardware of the radar system is analyzed and modeled.The limitation of phase value makes the beam synthesis theory of conventional phased array antenna no longer applicable.The conventional phased array antenna continuously controls the beam direction by changing the phase difference between adjacent elements.In metamaterial antennas,discrete phase values can only synthesize limited beams.In this paper,the relationship and difference between them are analyzed,and the relationship between bean synthesis and the equivalent spacing of traditional phased array antennas is analyzed from the repetitive coding.Based on the relationship between different coding models and antenna pattern,a convolution method is proposed to synthesize beams.Combing the two methods,the 2-D space beam synthesis algorithm is analyzed and the data searching method is obtained.After the simulation and analysis of the above methods,a 2-D beam-oriented beam synthesis method based on the solution of the overdetermined equation is proposed.It greatly extends the beam range that can be synthesized the improves the flexibility of the beam.In this paper,the application scope and limitations of each method are given according to the characteristics and limitations of the above methods,which provides the theoretical analysis support for beam synthesis under different conditions and different requirements.Finally,the beam performance of the above method is optimized.Due to the influence of the feeding mode of the antenna,the sidelobe performance of the beam needs to be improved.This paper mainly optimizes the sidelobe by changing the amplitude distribution on the antenna reflector and array signal processing.The target detection performance of information metamaterial antenna is also analyzed.Angle measurement is an important function of radar.For the metamaterial antenna system,the maximum signal method and the equal signal method can be used.The hardware implementation of these two methods and their angle measurement performance are analyzed in this paper.At the same time,using the array signal processing theory,combined with the metamaterial antenna,the target echo spectrum is estimated to achieve angle measurement.The performance of the metamaterial antenna in target detection and tracking is also given as a reference for practical application.