基于涡旋电磁波的太赫兹前视三维成像方法OA

In view of the fact that the traditional forward-looking radar imaging technology can only achieve two-dimensional(2D)imaging,in this paper,a forward-looking three-dimensional(3D)imaging method for terahertz radar is proposed.First,based on the multi-transmitter and multi-receiver mechanism of uniform circular array(UCA),an echo model for the forward-looking 3D imaging of terahertz vortex radar is established.Second,with the time-sharing multimodal scanning imaging method,3D imaging is achieved by using the amplitude and phase differences of different modal vortex electromagnetic waves,i.e.,the amplitude differences at different elevation angles and the phase differences at different azimuth angles,based on 2D imaging.Finally,an improved backward project-distance Doppler algorithm is proposed,by which the 3D focusing imaging of targets can be achieved while improving the imaging efficiency.The simulation imaging results of point targets verify the 3D imaging capability of the proposed method in the coverage scenarios of terahertz multimodal vortex waves.