Modeling And Simulation Of Sea Detection By Airborne PD Radar

Airborne radar,with its pulse Doppler system and strong target tracking ability in the background of sea clutter,has become an absolute superiority detection equipment for detecting ultra-low altitude penetration targets such as bombers and unmanned patrol aircraft which are barriered by terrain,warships and civilian ships which are covered by complex sea conditions,and plays an important role in early warning detection,battlefield monitoring and fire control.In the aspect of Airborne PD radar sea area detection,studying the motion and detection attributes of seaborne targets,studying the working principle and signal processing flow of Airborne PD radar,constructing an accurate and effective target echo model,and studying its sea clutter echo model based on working scene is an important way to improve the clutter suppression ability of airborne radar and improve the performance of airborne radar.This thesis focuses on the target detection requirements of Airborne PD radar for sea detection scene:(1)The characteristics of seaborne targets are analyzed,and a seaborne detection target model with complete organizational structure and clear characteristic description is constructed from three aspects of recognition,detection and movement;From the perspective of detection attributes,the position coordinate representation based on different target attitudes and coordinate system benchmarks,as well as the RCS value calculation based on Swerling fluctuation model are studied.From the perspective of motion attributes,the motion mathematical model of carrier and target is established,and a plane trajectory fitting algorithm is proposed.Finally,the simulation experiments of RCS calculation,carrier target trajectory generation and trajectory fitting are completed by MATLAB.(2)Based on the structure,working principle and detection process of airborne PDRadar system,a correct and reasonable target echo model is constructed and simulated,combining with the restriction and influence relationship of related contents and parameters of target model.On the basis of target echo modeling and simulation,typical signal processing and data processing processes of airborne PDRadar are studied and analyzed.The feasibility and accuracy of target echo model are further verified by simulation experiments of typical signal and data processing processes of airborne PD Radar.(3)Research and analyze the clutter characteristics of Airborne PD radar,carry out the research on clutter statistical modeling,select the appropriate statistical mathematical model to simulate the clutter sequence that meets the requirements of amplitude distribution and power spectrum distribution,and complete the clutter statistical modeling and simulation;Based on the radar working scene,the accurate modeling of sea clutter echo is studied,and the accurate modeling and Simulation of sea clutter echo are completed;Finally,based on the modeling of target echo and clutter echo,the simulation of airborne radar synthetic echo and sea area target detection is completed.(4)Using the QT development platform,a distributed deployable and operational radar system software is designed and compiled,which integrates scene generation,radar processing and output display functions for communication data transmission based on DDS messaging middleware.Scene output module,display module and radar processing module are used to simulate the radar detection process,and scene is used to verify the correctness of module communication and processing results of the radar detection software.