Research On DSP Simulation Method Of Sea Clutter

When the radar is working,it is often faced with clutter interference,which seriously restricts the radar detection performance,so the study of radar clutter mechanism and statistical characteristics of the industry has been concerned about the hot spots.After many decades of domestic and foreign scholars efforts,the clutter theory model has made many achievements.However,most of the clutter research results are based on theoretical simulation,the theoretical research combined with the application of hardware research is not much.According to the clutter model,the hardware implementation of a variety of clutter,finally developed radar clutter simulator used to solve various problems in radar field test,shorten the radar test cycle and testing cost,has great practical value.The main work of this paper is based on the statistical model of radar clutter,using digital signal processor platform to realize the simulation of several typical sea clutter.The work of the paper mainly from the following aspects: 1.Through the comparative analysis,to determine the hardware development platform is TL6748-Easy EVM development board,DSP chip is TMS320C6748,software development platform is Code Composer Studio.And then combined with the hardware and software platform,a detailed description of the development environment of the configuration work for the follow-up clutter simulation work to provides a guarantee..2.After analyzing the expression patterns of three classical amplitude distribution models and three common power spectrum models and the application scope,combined with the development process of specific DSP projects,the frequency domain transformation and inverse cumulative distribution function method are used to simulate one-dimensional correlated clutter and uncorrelated clutter on the DSP.Compared with the expected value,the simulation results are in good agreement.3.In order to make the simulated radar clutter more close to the measured data in detail,this paper presents a simulation method of non-stationary K-distributed clutter based on autoregressive(AR)model.Based on the measured data of IPIX radar,the amplitude distribution and power spectrum characteristics of the measured data are analyzed.It is found that the composite K distribution is more suitable for describing the amplitude characteristics of IPIX radar data,and the actual clutter has non-stationary characteristics,that is,the clutter amplitude envelope and The center frequency of the power spectrum varies with time.Finally,the clutter simulation based on this method is realized on the DSP,and the simulation results are in agreement with the expectation.The method can effectively simulate the K-distributed clutter with non-stationary characteristics on the DSP.4.After a careful examination on the temporal correlation and spatial correlation of sea clutter,the paper proposes the method of space-time correlation characteristic of whole using a correlation matrix representation,and considering the long tail clutter amplitude distribution,analyzes the advantages of Pareto distribution model.Combined with the concrete realization of the two-dimensional frequency domain transform method on the DSP,the space-time two-dimensional Pareto distributed clutter is simulated by the hardware platform.The simulation results are in good agreement with the expected results,which proves the feasibility of DSP simulating two-dimensional spatiotemporal correlation clutter.