Research Of Scheduling Method For Multifunctional Radar Network

Three-dimensional(3-D)through-the-wall radar imaging(TWRI)is an emerging technology for detecting the unknown targets on enclosed structure,it can provide more information of the region of interest compared with the conventional 2-D TWRI,and improve the detection accuracy and meet the diversified needs of detection.With these advantages,3-D TWRI is widely applied in the civilian and military fields such as rescue missions,surveillance and anti-terrorism,which has been received considerable attention recently.Aiming at three-dimensional imaging methods for through-the-wall radar,this paper develops the work as follows:1.According to the characteristics of typical enclosed structure,the propagation laws of electromagnetic waves such as transmission,reflection,and refraction are analyzed.And 3-D electromagnetic propagation models of targets and various multipaths are established.Multipath ghosts are classified based on their distribution and their corresponding walls,and simulations approve the correction of the models.2.To eliminate the influence of the front wall on 3D TWRI,the minimum delay based delay compensation method of the front wall is improved.Three kinds of autofocus imaging methods: the K-order integration focusing method,the higher-order statistics focusing method,the optimal focusing time method,are studied for the unknown parameters of the wall during actual detection of the through-the-wall radar,they can eliminate the influence of the delay of the front wall on the imaging,and estimate the wall parameters at the same time.The performance,characteristics and suitability of the three types of autofocusing methods are analyzed.The above methods were verified by simulation.3.Aiming at the problem of multipath ghosts interference in enclosed structure,the correlation-matching 3D multipath suppression algorithm is designed and analyzed in detail.The simulation proves that this algorithm can effectively remove the multipath ghosts and it can improve the quality of low signal-to-noise ratio images.According to the characteristics of one-way multipath,a one-way multipath joint suppression algorithm is designed,and its effectiveness is verified by simulation and experiments in 2D imaging system,and by simulation in 3D imaging system.In this paper,modeling,imaging,front wall compensation and multipath suppression of the 3D imaging technology of through-wall radar is researched.The simulation and experiment verify the validity of the above models and methods.It is important for the development of three-dimensional imaging technology,and also lays the foundation for the future research work.