Fig. 9 shows the calculated cosine of the principal angles
between the subspaces of the database and location P80. The
horizontal axis in Fig. 9 represents the location indexes of the
database and the vertical axis shows the cosine of the
calculated principal angles. Our method could distinguish
between the close locations around P80, such as P70 and P90.
Another peak was observed at P400 in Fig. 9. That was
attributed to the fact that P80 and P400 and the array antenna
were almost linearly aligned.