Research Of Human Security Holographic Radar Imaging Algorithm

The holographic radar imaging exhibits the advantages of real time,high resolution,3D imaging and large aperture.Meanwhile,holographic radar imaging has the non-ionization characteristic,which will not affect human health at moderate radiation power and is one of the directions for the development of hidden target detection in the future.However,the current holographic radar imaging system has some problems in the application of human security check scenarios,which need to be solved,such as imaging algorithms with large computational complexity and slow imaging speed.Therefore,there is an urgent need to further the study on fast algorithms for holographic radar imaging.Based on this,the work of this paper is as follows:(1)Understand the holographic imaging radar theory.Studied the work of holographic radar pointed out that Imaging is the linearization of nonlinear electromagnetic inverse scattering problem solving process.Introduces the concept of electromagnetic inverse scattering based on holographic radar imaging based on angular spectrum(wave number spectrum domain,space)theory of the holographic radar imaging,for different parameters of holographic radar images of the point spread function.(2)The holographic radar imaging principle is explored.Two radar waveforms,linear frequency modulation signals and step frequency signals commonly used in holographic radar are examined.Two common holographic radar imaging algorithms of time domain algorithm and spatial spectrum domain algorithm are grasped.The overall structure of holographic radar imaging is explored.The overall structure of the system,software architecture and system work flow are mastered.The data processing control software,trigger control software,acquisition and processing software and real-time imaging software architecture design are accomplished.(3)A fast efficient imaging algorithm is studied and a fast algorithm based on holographic scene is proposed.This method is based on the analysis that the echo signal of holographic radar and synthetic aperture radar in time-frequency domain and spatial-spatial spectral domain has equivalence,borrows the concept of Doppler frequency in holographic radar imaging,improves the two-dimensional distance Doppler algorithm,and thus achieves the application of Doppler domain algorithm in holographic radar imaging.Through the simulation analysis and experimental test of the three algorithms,it is proved that the holographic radar imaging method based on the distance Doppler concept has the advantages of fast imaging speed and convenient motion compensation,and it makes up the deficiency of the existing imaging algorithm.(4)For system for has experiment test,showed that system using improved Hou of RD algorithm of real-time sex,and correction performance,and image tell force,index are is better than project index requirements,products work performance stable,can extended sex strong,meet imaging of needs,used distance more general Le holographic radar imaging algorithm,not only can while on more movement target for compensation and the imaging,and imaging speed also has sharply of improve(Imaging speed about improve has 6 times times).