Research On Ground Clutter Suppression Technology Based On X-band Rain Measurement Radar

Due to the advantages of small size and high mobility,X-band weather radar is more and more used in precipitation information detection.However,the meteorological echo of the X-band weather radar is greatly affected by clutter of the ground,and the obtained precipitation information has a larger error than the real precipitation information.The traditional clutter filtering method can filter out part of the weather signals while filtering clutter.In this paper,starting from reducing the interference of ground clutter to meteorological echoes,the research is carried out from the simulation of radar echoes,the identification and filtering of ground clutter,etc.The main work of the paper includes: 1.The parameterized model for simulating meteorological targets was studied: the spatial rainfall rate was simulated according to the spatial distribution characteristics of rainfall,and then the relationship between the rainfall rate and the reflectance factor,the meteorological radar equation,and the atmospheric and rainfall particles for electromagnetic waves Attenuation completes the parameter simulation of the rain target echo power in a certain spatial distribution.For the simulation of the speed of the rain target,on the basis of analyzing the time and frequency domain characteristics of the meteorological echo,the spectrum simulation technology for the meteorological echo is used to complete the parameter simulation of the radial speed of the rain target.The two parameters are used as input for simulating meteorological echo,which can complete the simulation of space rainfall target.2.Researched the ground clutter suppression technology based on X-band radar: according to the characteristics of ground clutter speed is basically close to zero speed,narrow velocity spectrum width and high energy peak,combined with fuzzy logic technology,using clutter reduction decision algorithm(CMD)And Spectrum Clutter Identification Algorithm(SCI)to identify ground clutter of X-band radar echoes.The CMD algorithm is improved.Simulation experiments show that the improved CMD algorithm has better performance than the original CMD algorithm.In the study of ground clutter filtering: for the overlapping of ground clutter and meteorological echo,the ground clutter filtering scheme based on dynamic target display and Gaussian adaptive algorithm was analyzed,and the filtering effect A good Gaussian adaptive algorithm and ground clutter recognition algorithm are combined to study ground clutter filtering and suppression methods based on ground clutter recognition results.Simulation experiments show that this method can effectively reduce the ground error caused by ground clutter while suppressing ground clutter.3.Design and implementation of signal processing system: According to the system requirements of X-band radar,the digital signal processing system is designed and implemented with Xilinx's ZYNQ?7Z100 chip as the core processing device.Compared with the traditional digital signal processing system,this system can adjust the generated intermediate frequency signal and signal processing scheme through parameter configuration,which can meet the needs of different situations.