Research On Direction Finding Algorithm Of Polarization Sensitive Array Based On Conformal Antenna

The conformal antenna can be attached to the surface of the carrier and is consistent with the outer shape of the carrier.Therefore,the conformal array not only has good aerodynamic performance and stealth performance,but also has a lower Radar Cross Section(RCS)and a larger beam scanning range.The polarization-sensitive conformal array can sense the angle domain and polarization domain information of the target at the same time.Therefore,the polarization-sensitive conformal array has broad application prospects in many military and civilian fields,such as missile-borne,airborne,shipborne,shipborne,and spaceborne.However,the internal structure of the conformal array is complicated,and the orientation of the array elements are inconsistent,and due to the existence of the carrier,a certain "masking effect" is caused,that is,for the signal incident in a certain direction,some elements in the conformal array cannot normally received,the steering vector presents "incompleteness".In response to the above problems,this paper reconstructs the array steering vector based on the array element pattern data,and combines the polarization multiple signal classification(MUSIC)algorithm to realize the source parameter estimation.On this basis,the algorithm is further studied.Practicality.The main research contents are as follows:1.The paper briefly describes the spatial spectrum direction finding system model of the planar antenna array,and gives the corresponding classical direction finding algorithm.On this basis,the basic theory of the conformal array and the corresponding antenna signal model are derived.At the same time,the pattern simulation,shadowing effect and multi-polarization effect of the circular conformal antenna array are discussed in depth,and the problems of classical direction finding algorithms in the estimation of conformal antenna parameters are analyzed.2.Aiming at the inherent shadowing effect and multi-polarization effect of the complex carrier conformal array,this paper proposes a polarization MUSIC algorithm based on steering vector reconstruction.This method first obtains the azimuth and elevation component pattern data of each element,and then decomposes and reconstructs the pattern data to obtain a new steering vector matrix.On this basis,it combines the polarization MUSIC algorithm to realize the direction of arrival(DOA)and polarization parameters.The improved algorithm proposed in this paper has higher parameter estimation accuracy while solving the occlusion effect,and can effectively reduce the calculation amount of the overall algorithm.3.Aiming at the actual engineering application of the algorithm,this paper considers that the main polarization and cross-polarization pattern data can be obtained in the actual measurement environment,so it is proposed to reconstruct the steering vector based on the main polarization and cross-polarization pattern data.Then combined with the polarization MUSIC algorithm for parameter estimation.In view of the fact that the measured pattern is more suitable for the actual signal model,the improved algorithm in this paper has higher estimation accuracy.