| In the context of Ku-band warning radar,this paper analyzes the ground clutter model for the problem of ground clutter affecting target detection,and studies the ground clutter suppression algorithm.In this paper,the ground clutter suppression algorithm is analyzed from the aspects of MTD,MTI,time-frequency analysis and clutter map.The simulation software of ground clutter suppression for radar system is designed and the results of suppression are given.The work of this paper is as follows.Firstly,based on the characteristics of ground clutter,the statistical distribution of ground clutter,including Rayleigh distribution,Weibull distribution and K distribution,is introduced in detail,and various power spectrum models of clutter are analyzed.On this basis,The pulse compression technology in the signal processing process is introduced and simulated.Secondly,in order to solve the problem of ground clutter suppression,this paper discusses the method of suppressing ground clutter by using MTD algorithm.The suppression effect of clutter by FFT method and FIR method is analyzed separately.The FFT and FIR filters were analyzed and finally simulated.In order to solve the problem of poor suppression of ground clutter by MTD algorithm,this paper introduces the suppression effect of MTI algorithm on ground clutter,and analyzes the principle of two-pulse MTI canceller and three-pulse MTI canceller in detail.And extended to the design of the N pulse canceller.In the simulation,the MTI canceller is used to process the signal,and then the echo pulse is subjected to the corresponding MTD accumulation.Combined with the MTD and MTI methods,the suppression effect on the clutter is effectively improved and performed.Simulation and analysis.Because MTD and MTI are more traditional in the method of clutter suppression,and in some cases can not achieve better suppression of clutter,this paper uses time-frequency analysis and clutter map to suppress clutter.In the time-frequency analysis method,the clutter suppression method based on short-time Fourier transform is introduced,and its principle is analyzed,and its simulation and implementation are carried out.At the same time,the principle of the clutter map method is analyzed and related simulations are carried out.Finally,after implementing the above algorithm,this paper designs the radar clutter suppression simulation software,and designs the whole software main interface through the function analysis of each part.With this software,a variety of clutter suppression algorithms can be implemented and their clutter suppression performance can be analyzed.In the simulation software design process,the parameters are first set and the relevant radar signal processing model is determined.Finally,the operation of the whole system was tested,and the simulation and design of each clutter suppression method were carried out.At the same time,each method was compared and analyzed. |
PDF Full Text Request