DOA estimation of ultra wide band impulse radio signal

For ultra wide band impulse signal direction of arrival estimation, conventional wide band algorithms need to divide the wide band frequency into narrow band bins, but the time width of an impulse is about a nano second and the collected signal duration to do Fourier transform is about a few nano seconds, does the frequency resolution satisfy the narrow band condition? We show that the narrow band assumption also hold. We also obtain the signal noise ratio loss when only one frequency bin data is used to do DOA estimation. When impulse waveform is known, a subspace-based high resolution joint DOA delay estimation algorithm is obtained.