Study On Ship Target Tracking Methods Of Multi-Station Sky-Wave Over-the-Horizon Radar

Sky-wave over-the-horizon radar exploits the ionosphere reflection of high frequency band to detect targets,and has many advantages such as wide monitoring range,long detection distance,anti-stealth,and anti-ultra-low altitude targets.However,the ionosphere that its detection relies on has been in a state of non-uniform and non-stationary changes,it will encounter many problems that conventional radars do not have when processing target tracking data,such as high false alarm probability,low detection probability,large measurement error and multipath propagation.In this thesis,the target location method of multi-station sky-wave over-the-horizon radar and its optimal station placement method are studied.And the ship target tracking method is deeply studied according to the data characteristics of sky-wave over-the-horizon radar.The main research contents of this thesis include the following aspects.Firstly,the detection system and data processing structure of multi-station sky-wave overthe-horizon radar is described.Several common coordinate systems in the target positioning system and their mutual conversion methods are introduced.Combined with these coordinate systems,the coordinate registration method of the spherical measurement model of the sky-wave over-the-horizon radar and the multi-station joint positioning method are deeply studied.The positioning accuracy of the positioning model is simulated and analyzed under the typical measurement error of sky-wave over-the-horizon radar.Secondly,combined with the positioning model of sky-wave over-the-horizon radar,the measurement method of positioning performance is studied.Considering the influence of the uncertainty of the measurement value of the ionospheric reflection point on the positioning performance,the optimal mathematical model of the optimal station placement problem is established.The particle swarm algorithm is used to solve the problem,and the results show that the optimized positioning performance is 18% and 39% higher than that of the fixed-configuration Y-shaped and T-shaped configurations,respectively.Finally,the track correlation and filtering method of multi-station sky-wave over-the-horizon radar to ship targets are studied.Several common track association and filtering methods are introduced,and their advantages and disadvantages are analyzed and compared.Aiming at the problems of inaccurate data correlation and low tracking accuracy caused by low detection probability,high false alarm probability and large measurement error of sky wave over-the-horizon radar,a ship target tracking method composed of multi-channel multihypothesis correlation method and measurement-corrected Bernoulli filter method was studied under a mixed coordinate system.The multi-channel multi-hypothesis correlation method regards the data of multiple channels of the target formed by the multi-station radar as multiple hypotheses of the target state.And forms the local track of the target in each channel.Date correlate using raw data in a radar coordinate system with high correlation within the channel.Improving the accuracy of track correlation in scenarios with high false alarm rate and low probability of discovery.The measurement-corrected Bernoulli filtering method utilizes the consistency of the motion state of the weakly maneuvering ship target’s immediate neighbor.And uses the track history value is preliminarily corrected for the measurement value obtained at the current moment before filtering it,which improve the tracking accuracy of slow targets under large measurement error.Simulation and measured data show that this method can effectively improve the tracking effect of sky-wave over-thehorizon radar to ship targets...