The azimuth angle resolution was measured by using two 10dBsm corner reflectors placed in the same range-bin at a radial distance of about 9.5 meter from the radar. Boresight calibration is applied prior to angle estimation (for example, measurements from a single corner reflector placed at boresight are used to compensate for the inter-channel phase gain mismatch).

The angle estimation was performed using a 512-point FFT. The measured angular spectrum from the range-Doppler bin corresponding to the reflection of the corner reflectors is shown in Figure 3-1 where we can see the peaks corresponding to the two corner reflectors. The measured angular separation between the peaks is about 3.3 deg which is close to the theoretical angular resolution of about 3 deg. Higher angular resolution can be obtained by using more computationally extensive angle estimation methods such as Capon Beamformer or MUSIC.

Figure 3-1 Corner Reflectors

Angular spectrum from the range bin corresponding to the two corner reflectors is shown in Figure 3-2.

Figure 3-2 Angular Resolution Measurement