Research On Clutter Simulation And Suppression Technology Of Airborne Passive Radar

The airborne passive radar is of great concern for many scholars because of its many advantages such as wide visual range and quiet detection,but it will cause more complex clutter in the working process,which brings great challenge for target detection.Therefore,it is necessary to study effective methods to suppress the clutter of airborne passive radar.The geometry of the airborne passive radar is complex and diverse.In this paper,only a few typical configurations of radar are selected to simulate the clutter and study the clutter suppression technology.The specific research content includes the following three aspects:1?In this paper,establishing the spatio-temporal clutter model and simulating the clutter in several representative radar configurations,it is found that most of the situation of airborne passive radar clutter will have doppler shift,which has distance extension.To eliminate or reduce the influence of clutter on target detection,a filter with clutter distribution characteristic notch is needed.Therefore,this paper chooses classical space-time adaptive signal processing for the positive side array of clutter suppression.The method can process the received signal by adaptive weighting,then the clutter is processed.Due to the non-expansion of clutter in the positive side array,the space-time adaptive signal processing method can effectively suppress the clutter and provide guarantee for subsequent target detection.2?In view of the large amount of calculation in the space-time adaptive signal processing method,this paper briefly introduces several methods to reduce the amount of computation,and selects the auxiliary channel method to suppress the clutter under the positive side array.For the problem that the auxiliary channel method is limited by the prior information and system error of the radar when to use ACR method,so the adaptive auxiliary channel method is used for processing.The method can first estimate the clutter distribution by using single distance unit echo data,and then through the least squares method to estimate the radar system parameters.Finally the auxiliary channel is adaptively selected for signal processing,which has certain robustness and usability in practical applications.By plotting the improvement factor graph of the method,the performance loss of the method is also similar to that of space-time adaptive signal processing method.3?For the clutter simulation results obtained in Chapter 2,in order to facilitate the view of the simulation results of clutter in various configurations,this paper uses the graphical user interface to display these graphics in real time.The overall logic framework is built through the locking and unlocking relationship between the buttons.This article build the final display interface on the component panel,and then write the callback function of each control to realize the functions of each part.At this point,the user can directly interact with the interface to get the image to be displayed.The method can visually and clearly demonstrate the previous simulation result diagram,which is convenient for the user to interact with the computer.