Modeling And Simulation Of Radar Electromagnetic Enviroment

In modern warfare,the electromagnetic environment has become a key factor and must take into consideration.Limited by the actual conditions,the real electromagnetic environment cannot reproduce all factors,and only achieve the equivalent construction.The application of electronic equipment simulates the radar electromagnetic environment by in-kind or semi-physical simulation method.It requires a lot of electromagnetic equipment.This method is strict to protection conditions,and has long preparation cycle,high cost.Thus,the implementation is difficult.There are many advantages of digitally simulation for electromagnetic environment,which utilized by computer,such as low cost,high efficiency,precision and controllable.In this thesis,we use the all-digital construction method to establish the signal model of each element in the radar electromagnetic environment.According to the process of the signal propagation in the space,we completely simulate the form in radar receiver and construct the radar environment as much as possible.All of these can reduce cost for the new system radar in demonstration and evaluation of the experimental.In addition,it ensures the fidelity of complex electromagnetic environment simulation.Firstly,the formation mechanism and complexity for the radar electromagnetic environment are analyzed,and the main component of the radar electromagnetic environment is summarized.The production mechanism and propagate procedure for background environment signal,jamming signal,target echo and clutter which compose the complex radar electromagnetic environment are analyzed.Then,the models of typical radar transmit signal and communication signal are established.The transmission loss,distortion and noise model are analyzed and simulated from domain of time,frequency,airspace,polarization and energy.This thesis discusses the mathematical model for common jamming model,and simulate the modeling of active blanket jamming,active deceive jamming,smart noise jamming and chaff cloud jamming.In addition,we summaries the simulation and modeling method for target echo and clutter,the target fluctuation statistical model,multipath echo model and clutter scattering properties model are discussed at the same time.Finally,this thesis has done the study of the correlation between background sources and radar at radar electromagnetic environment.Based on the concept of cross-level modeling,the radar electromagnetic environment correlation coefficient model is established,which is derived from the domain of time,frequency,airspace,polarization and energy.At last,this thesis expounds the computing method for correlation and makes a summary of the relationship between the correlations and radar electromagnetic environment simulation.