Research On Passive Location Algorithm Based On Two-Aircraft Cooperation

With the development of modern radar stealth technology and anti-radiation weapons,the detection and survival of traditional active radars are more and more threatened,and passive detection and positioning are gradually being valued and applied.The use of flexible and concealed mobile platforms for fast and accurate positioning of radiation sources plays an important role in wartime information collection.This paper focuses on the two-aircraft passive model based on angle measurement,and discusses the target location solution and multi-target scene.Firstly,the classical 2D-DOA and 3D-TDOA/AOA passive positioning models are analyzed and summarized,and further from the physical relationship between the measured parameters and the target position,the establishment of the model,the construction of the observation equation and the positioning solution method are systematically studied.It is found that the angle observation plays an important role in passive positioning.From the phase difference,the angle measurement characteristics of the interferometer of the line array and the area array antenna array are compared,and the circular array is used to measure the azimuth and elevation angle of the incoming wave.It has the advantage of wide coverage and no blur.Subsequently,a two-aircraft coordinated AOA positioning model was established to achieve high-precision positioning performance with less observing stations and measurement parameters.The model only takes the azimuth and elevation angles as inputs,can eliminates the influence of intermediate variables and have high duality and clear physical meaning,moreover model can be directly extended to multi-station positioning applications.At the same time,combined with the least squares estimation and variants,eliminate from the cause of the error to improve the accuracy of the positioning solution.Finally,the RB-MUSIC algorithm is used to estimate the multi-angle in the multi-target localization scene,and the method of subspace signal separation and spatial alien line relationship is introduced to match the target in space time.A twomachine joint denoising eigenvalue method is proposed in the estimation of signal source number,and combined with RANSAC fitting,it has a great performance improvement under low SNR conditions.Finally,an idea of joint dimensionality reduction projection is proposed to achieve direct matching angle measurement between the two machines,so that multiple targets can be transformed into multiple single targets for positioning.This paper proposes a two-aircraft AOA positioning model,and the multi-target scene is completed according to the number of signal source estimation,the incoming wave angle estimation,the two-machine direction finding target matching and the coordinate positioning solution,a complete two-aircraft passive positioning analysis scheme is formed.