Abstract:

The spatial baseline method based on interferometer has a more flexible model of antenna array compared with traditional direction finding ambiguity solving methods. For this advantage, a model of nonuniform circular antenna array is established. The expressions of theoretical direction finding errors are given, and a method of reducing the actual direction finding errors is proposed based on the analysis of the factors which influence the direction finding errors in the process of calculating. To ensure that the system has a certain ability of solving ambiguity, the limitation of antenna aperture on ambiguity solving frequency range is given. Based on the established antenna model, the simulation results verify the validity of the method and its feasibility to choice antenna aperture reasonably and reduce the error of the direction finding system.