Research And Simulation On Signal Processing In Multi-station Sky-wave Over-the-horizon Radar

Due to its far detection range,anti-stealth and other advantages,Sky-wave radar has received widespread attention and has been widely used.Based on the research on multi-station sky-wave radar,this paper constructs a multi-station sky-wave radar system.In multi-station sky-wave over the horizon radar system,the ocean clutter suppression and the correction of ionosphere phase contamination are the main factors that restrict the detection result.Focused on the two problems,this paper gives the knowledge-aided ocean clutter suppression method and the reference target-based ionosphere phase pollution correction method.Thus,the main content of this paper is:(1)Multi-station sky-wave over the horizon radar system construction and signal processingThis paper first gives the ionosphere model,the ray propagation model,echo-signal model and the ocean clutter model.Using these models,a multi-station sky-wave over-the-horizon radar system is constructed.Based on this system,the processing flow and the simulation results are given.(2)Knowledge-aided ocean clutter suppression methodThis paper first analyzes the similarities and the differences between multi-station radar system and phased-array radar system in ocean clutter suppression.Then,based on optimal filtering method,the ocean clutter suppression method based on ionosphere phase polluted first order spectra model and the ocean clutter suppression method based on ocean spectrum model are given.Simulation results show that,compared with the optimal filtering method,these two methods have improved the ocean clutter suppression result.(3)Ionosphere phase pollution correction method based on reference-targetThis paper first analyzes the similarities and the differences between multi-station radar system and phased-array radar system in ionosphere phase pollution correction.Then,based on the deep research on ionosphere phase correction algorithm,the HRR algorithm and the PGA algorithm based on reference target are given.Simulation results show that,when the frequency of ionosphere phase pollution is not large,the HRR algorithm,the PGA algorithm and the HRR algorithm based on reference target,the PGA algorithm based on reference target can all have the good correction of ionosphere phase pollution.While,when the frequency of ionosphere phase pollution is large,the HRR algorithm and the PGA algorithm cannot have good ionosphere phase pollution correction result while the HRR algorithm based on reference target and the PGA algorithm based on reference target can.