Research On Super-Resolution Imaging Method Of Shipborne Navigation Radar And Design Of Host Computer Software

Shipborne navigation radar has all-day and all-weather working ability,which can improve the ship’s ability to avoid obstacles and perceive the surrounding situation.It is an indispensable shipboard equipment for ship navigation.However,the existing shipborne navigation radar adopts the real aperture scanning system,which is limited by the inherent aperture of the antenna,the azimuth resolution of the target imaging by the radar is low,and the existence of sea clutter seriously restricts the clear imaging of the shipborne radar.Therefore,how to improve the azimuth resolution of real aperture radar has become an urgent problem to be solved for shipborne navigation radar.In this thesis,according to the needs of super-resolution imaging of shipborne navigation radar,the research is carried out around the imaging model,statistical characteristics of sea clutter and super-resolution method,and the host computer software of shipborne navigation radar is designed and developed.The specific research contents are as follows:1.Established the shipborne navigation radar echo signal model.The spatial geometric configuration relationship between the shipborne navigation radar and the target in the imaging scene is analyzed,the echo distance history is deduced,and the azimuth convolution characteristics of the scanning radar echo are accurately characterized,which provides a theory for the follow-up research on super-resolution methods support.2.A maximum a posteriori super-resolution imaging method based on Rayleigh distribution is proposed.Rayleigh distribution and Cauchy distribution function are used to characterize the distribution characteristics of clutter and target respectively,which solves the influence of clutter amplification on sea surface target detection by shipborne navigation radar,and effectively improves the azimuth resolution of shipborne navigation radar.3.Designed and wrote the host computer software of shipborne navigation radar.Using the WPF(Windows Presentation Foundation,Windows Graphics Foundation)technical framework and the MVVM(Model-View-ViewModel)architecture model,the host computer software with the function of super-resolution method was developed to provide technical support for the proj ect to improve the imaging resolution of shipborne navigation radar.The above model and super-resolution method have been verified by simulation experiments and measured data.The results show that the method in this thesis can realize super-resolution imaging of shipborne navigation radar,and the designed host computer software can run effectively and improve the resolution of imaging.