Code for Two-Dimensional Direction Finding by Time Modulated Circular Array

A novel two-dimensional (2-D) direction finding method is proposed and verified based on a 4-element time modulated circular array (TMCA). The received signals of four antenna elements are input to the single channel in turns. After the periodical modulation, the azimuth and elevation angles can be estimated simultaneously through analyzing the spectrum characteristic of the received signal. The proposed direction finding method has simple structure and concise signal processing. Its mainly calculation locates in the spectrum analysis of the received signal by the discrete Fourier transform (DFT) or the fast Fourier transform (FFT). Numeric simulations are provided to verify the proposed method, and the related factors influencing the accuracy of direction finding are investigated.