Figure 6: Azimuth angle estimation spectrum under MIMO scheme: (a) and (b); MISO scheme: (c) and (d). (a) and (c) use the FFT method, while (b) and (d) utilize the MUSIC algorithm. Two targets at and with the same elevation angle but different azimuth angles and are under illumination of main lobes of the UCCAs with configuration , , and at SNR = 10 dB environment.