Key Technology Research Of Phased Array Radar For Human-Computer Interaction Based On Limb Motion Detection

From the current trend of popularization of smart devices,the future of human life will be surrounded by more and more electronic consumer products.In the visible future,intelligent systems can successfully predict the underlying objects according to the daily demand process in a high probability.One-step instructions implement part of the intelligent automation,but the complete non-instruction input to achieve intelligent system control is still difficult to achieve in the short term.Therefore,the research on related technologies of human-computer interaction is still of great practical significance.The radar-based motion recognition system can effectively avoid the potential impact of excessive information collection on user privacy and security while achieving effective detection and identification of limb movements.Based on this application scenario,this topic studies the key technologies required for phased array radar for human-computer interaction limb motion detection systems.The main research contents of this paper are as follows:Firstly,according to the application scenario of human-computer interaction limb motion detection,the design requirements of the phased array antenna array are analyzed and an antenna array with a working frequency of 12 GHz is designed.The design scheme is simulated and verified in CST Microwave Studio.By using the MATLAB antenna array toolbox,the array is windowed to achieve effective suppression of the sidelobe level.Based on this,the layout of the antenna array is designed with the display as an example,and further according to the actual application scenario.The overall scheme of the phased array radar system in the application scenario of human-computer interaction limb motion detection was designed.The basic processes and ideas involved in this design scheme are not only applicable to the system in this frequency band,but also can be used for system design in higher frequency bands.Therefore,the content described in this paper has great practical application value.Based on the research of array elements,this paper analyzes other key structures and technologies of phased array radar for human-computer interaction limb motion detection,including digital transceiver unit,phase shifting system and beam control system..In addition,the related technologies including RF phase shifting,intermediate frequency phase shifting and baseband phase shifting are analyzed,and the phase shifting scheme including RF phase shifting and digital phase shifting is designed and implemented.The phase shifting function is realized by physical production and testing.In addition,the effective control of the array phase shifting system is realized by designing the beam steering system.Finally,this paper designs and tests the array antenna beam steering system for human-computer interaction limb motion detection.The test results verify the effectiveness of the hardware structure and meet the expected design specifications.In the specific application scenario of human-computer interaction system,Effectively functioning has a strong practical significance.