| In recent years,active phased array radar(APAA)has been paid more and more attention by researchers because of its superior detection performance,and has gradually become a research hotspot in the field of radar.The phased array antenna adopts the form of array antenna,which has incomparable advantages compared with the traditional mechanical scanning antenna,such as high reliability,high data rate,good stealth performance,high density,high integration,high gain,low sidelobe and so on.Therefore,the mechanical-electromagnetic coupling of radar has become one of the bottlenecks in the development of active phased array radar.For this reason,this paper takes phased array radar as an example to deeply analyze the coupling relationship between the structural deformation of array antenna and the main detection performance parameters of radar.The main research contents of this paper are as follows:(1)Deeply study the theory of radar target detection performance,introduce the definition and classification of radar detection performance;The calculation of various radar detection performance parameters are introduced,including: the furthest detection distance,the radar resolution,the radar detection accuracy,etc.Because the array antenna is an important part of the phased array radar,the antenna pattern,as the input of the radar detection performance,is affected by the radar antenna array surface deformation and other factors to produce structural deformation,and finally effect on the radar detection performance,so the main antenna pattern parameters affecting the radar detection performance are analyzed.(2)The basic radiation principle of antenna is described,the electromechanical coupling model of antenna structure deformation and radar detection performance are analyzed,and the influence mechanism of antenna structure deformation on the pattern is given.The coupling relationship model between antenna pattern parameters and radar detection performance parameters is established.Based on the above research,the coupling model of array antenna structure deformation and radar detection performance parameters are established.Given the amount of structural deformation of the array antenna,the main detection performance parameters of the radar can be estimated quickly.(3)Using the orthogonal test method,vehicle-mounted radar is designed for lightweight weight reduction based on the coupling model of structural deformation of array antenna and radar detection performance parameters,the method of orthogonal test is used to design a vehicle-mounted radar.Firstly,the paper introduces why the orthogonal test and the advantages of orthogonal test are used in the lightweight design of the vehicle-mounted radar.Then,the mathematical model of vehicle-mounted radar lightweight is established,including selecting optimization variables,setting iteration times and setting optimization objectives.Finally,the whole process of lightweight is analyzed and the results are processed,including the establishment of optimization model and the evaluation of optimization effect.(4)C++ Builder software is used to develop fast calculation software of radar performance based on the electromechanical coupling model of detection performance.This software can quickly and effectively calculate the change of radar detection performance parameters when the antenna array surface has structural deformation.The overall design idea and specific contents of each module of the radar performance fast calculation software based on the mechanical-electromagnetic coupling model of detection performance are described in detail.Finally,the whole process of radar detection performance analysis with structural deformation is completed with an example,which verifies the practicability and effectiveness of the software. |
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