Influence Analysis of Shipborne Tracking Radar Tracking Sea-skimming Flying Targets
When a radar tracks targets flying over the sea,it is easily influenced by complex sea con-ditions,which results in the radar being unable to accurately track the target.During a tracking ra-dar test process,it is found that the elevation measurement value is abnormal when the radar tracks the target at a long distance,and is significantly higher than the true value.In response to this phe-nomenon,the article analyzes and locates the causes of abnormal elevation error,and summarizes that when the radar tracks targets at close range,due to the influence of multipath effects,the ele-vation tracking error undergoes periodic changes within a small system error,which conforms to the law of multipath influence.When the radar tracks targets at a long distance,evaporation waveguide is the main path,and it has a greater impact than that of the multipath effect,causes the propagation of electromagnetic waves to undergo"super-refraction"phenomenon,which results in significantly larger elevation measured at long distances.The relationship between elevation detec-tion error and distance at different launch angles is simulated and studied in the article.The results show that the radar electromagnetic waves are trapped by the evaporation waveguide and reflected multiple times inside the waveguide structure before reaching the target,which results in an in-crease in the elevation tracking error of the radar towards the target.
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