Abstract: Based on the traditional direction of arrival（DOA） estimation method of spatial signals by means of FFT‚a dual uniform linear array and the relevant DOA estimation method were designed for spatially confined signals．Both the deducted theory and the simulated result confirm that the proposed DOA estimation method based on the dual uni -form linear array can solve the problem of angle ambiguity．At the same time‚it can geminate the angle resolution and obviously decrease the computation‚when compared with the general DOA estimation method based on the uniform linear array with the same antennas number and the interelement spacing of half -wavelength．

Key words:  array design, direction of arrival estimation, Fast Fourier Transformation, dual uniform linear array, chirp Z transformation