Study On The Array Parameters Estimation Algorithm Based On Dipoles And Loops

The array parameters joint estimation algorithm of dipoles and loops is studied in this dissertation. The joint estimation algorithms of non-uniform linear array and uniform circular array DOA and polarization parameters are considered, then the algorithm of interferometer solving high-frequency signal phase ambiguity and improving the DOA estimation accuracy is discussed.Firstly, the joint estimation algorithms of non-uniform linear array DOA and polarization parameters based on rotation invariant subspace ESPRIT algorithm are studied; The inter-element spacing less than half-wavelength is used for getting unambiguous DOA estimation.The ambiguous value of DOA can be solved by the rough value to improve the direction-finding accuracy.Secondly, the joint estimation algorithms of the uniform circular array DOA and polarization parameters are studied. The joint estimation algorithm based on the phase difference is given. The ratio of circular array radius vs wavelength is increased, thus no phase ambiguity condition is expanded for improving the estimation precision of the arrival angle.Finally, virtual baseline two-dimensional direction-finding algorithm of uniform circular array is studied. The disambiguation algorithm is given when virtual array and real array position matrix are same or not. A detailed analysis of the uniform circular array virtual transformation process is researched. Virtual baseline less than half wavelength is used to get rough and unambiguous direction cosine estimates, then the phase ambiguity is solved by long baseline and higher accuracy DOA estimation is got.