A Novel Design Of Active Phased Array Antenna And Prototype Experiment

Active phased array antennas(APAA)have broad application prospects in the field of military defense systems and detection tracking.With the development of modern electronic technology,the active phased array antennas continue to put forward higher requirements in terms of mechanical structure,such as high precision,light weight,low complexity,fast dynamic response,etc.The innovative design of the novel active phased array antenna of cable-antenna combined antenna back frame and parallel driven antenna base has been carried out in a more in-depth and comprehensive study.1.Constructing of a novel active phased array antenna structure and analysis model.Firstly,calculating the number of DOF of the parallel driven antenna base mechanism,the size of the antenna base member and the cable-truss combination antenna back frame are designed.Then,adopting the finite element model method that combined Creo and APDL parameterization and improving the connection method of active module substrate and the carbon fiber frame,the antenna entity model and the finite element analysis model of the innovative scheme are preliminarily established.Finally,the relationship between the antenna motion velocity is derived,the singularity of the antenna base is analyzed,and the rationality of the model is verified.2.Optimized design of the antenna back frame structure.According to the distribution accuracy of the array and the parameters of the finite element analysis model,an optimal design model for the cable-truss structure is established.The pure truss and cable-truss antenna back frame structure are respectively optimized and designed,and the comparison optimization results show the potential advantages of the cable-truss combination structure.Then the accuracy and strength of the antenna are verified after optimization,and the antenna structure modality is analyzed.3.Research on pointing accuracy of novel active phased array antennas.Firstly,for ease of the error analysis,establish the antenna structure coordinate system;constructing the closed-loop vector of the parallel antenna structure,analyzing the influence of the error of the antenna structure azimuth column,the array back frame and the drive link in the parallel closed-loop vector on the antenna electric axis pointing accuracy,the parallel electric axis pointing accuracy model of the new active phased array antenna is established.Finally,basing on the pointing accuracy model,the pointing accuracy of the antenna is analyzed,under loads such as gravity,gravity and wind.4.The engineering realization of the prototype of the innovative program.The ADAMS dynamics simulation model of the antenna is established,and the dynamics simulation is realized by the dynamic inverse solution method.The antenna driving power peak,the driving torque peak and the force of the hinge and the connecting rod are obtained,which are used to guide the parameter calculation and common parts of the antenna seat member selection.Aiming at the problem of multi-case maintenance of the array structure in the development of the cable-integrated back frame of the innovative structure,we have proposed a prestressing cable connection method and real-time monitoring prestressing scheme and an intelligent method that realize adjustment of the antenna back frame prestressing cable.According to the requirements of the driving power obtained by the dynamic simulation of the antenna base,the parameters of the gear pair and the motor and are calculated and the type of guiderail is selected,which are determining for further assembling and debugging of the prototype.