| Active phased array antenna is widely used in national defense electronic equipment,which is its "eye" and "ear".As a high-tech,multi-disciplinary and long-period military product,active phased array antenna has technical problems that need to be solved in the design stage and service stage.In the design stage,there is a coupling problem between the interconnection structure between the internal modules of antenna T/R module and its signal transmission performance,and there is a lack of systematic and efficient scientific analysis method.In the service stage,the performance of the antenna array will fluctuate due to the environmental load.Therefore,it is necessary to monitor the status of the array in real time,so as to provide basis for subsequent performance compensation.Aiming at the interconnection and coupling problem of T/R components,this dissertation deeply studies the influence mechanism of interconnection structure and signal transmission performance,and proposes an interconnection state analysis method based on coupling analysis model.Aiming at the problem of antenna array deformation monitoring in service,a shape reconstruction algorithm based on inverse finite theory is proposed,and an array state evaluation criterion considering the electrical performance of the antenna is formulated.Finally,the condition monitoring and performance evaluation platform of active phased array antenna system is developed,and the above two kinds of technical solutions are integrated into the platform in the form of independent functional modules,which standardizes the process and lays a foundation for the integration of other technical solutions.The content of this dissertation is as follows:(1)Based on Web technology,the condition monitoring and performance evaluation platform of active phased array antenna system is developed.Based on the distributed development system,the front and back-end framework of the platform and the underlying data storage scheme are designed respectively,and the data transmission and interaction process specification between the core function module and the basic module of the platform is formulated,which lays the foundation for the integration of subsequent function modules.(2)Taking the interconnection processes between two common t / R modules,gold strip lap welding and lead lap welding,as the analysis object,the corresponding coupling analysis models are established according to their structural characteristics,and the interconnection performance analysis method of T / R modules based on this coupling analysis model is proposed.Based on the idea of orthogonal experiment,a screening method of key structural parameters with the most significant impact on interconnection performance is designed,and then the optimization design scheme for key structural parameters is constructed.The above research process results are developed into a module for interconnection condition monitoring and performance evaluation of T / R components and integrated into the platform.(3)Based on the inverse finite element theory,a high-precision array shape reconstruction algorithm is constructed,and the finite element simulation results are assumed to be the actual situation to verify the accuracy and effectiveness of the developed shape reconstruction algorithm.The calculation results of the other two common reconstruction algorithms are compared and analyzed,and the advantages of the proposed algorithm are demonstrated from the aspects of analysis time and reconstruction accuracy;Secondly,based on the electromechanical coupling model of phased array antenna,the array state evaluation criterion considering the electrical performance of antenna is formulated;Finally,combined with the above research process,the on-line monitoring and performance evaluation module of array state is developed and integrated into the platform.(4)Taking a vehicle mounted active phased array antenna as an example,the condition monitoring and performance evaluation platform of active phased array antenna system is analyzed.The analysis results show that under the initial parameters,the interconnection state evaluation level is qualified,S11 parameter is-16.2961 d B and S21 parameter is-0.1906 d B.After the selected key structural parameters are optimized by using the optimization design method proposed in this paper,the interconnection performance is improved by 14%,S11 parameter is-18.0311 d B,S21 parameter is-0.1802 d B,and the evaluation level is improved to good.Secondly,the monitoring results show that the current antenna gain is 54.10 d B,3d B beam width is 0.12°,and the array state level is good.Thus,the effectiveness and practicability of the web platform are verified. |
