1.65
1.32
0.99
0.66
Figure 33. Example of an ML
Figure 2729
wavenumber estimate from a verti-
0.33
Figure 31
cal geophone array at 11 Hz for an
Figure 33
M60 tank moving at 4.5 m s1.
0.00
Figure 3641
Coherence was 0.94, the spectral
maximum yields a velocity of 219 m
s1, and the source direction = 258.
0.33
0.99
1.32
1.65
1.65
1.32
0.99
0.33
0.00
0.33
0.66
0.99
1.32
1.65
EastWest Component of Wavenumber (m1 )
Linear Grey Scale: White Regions = 3 dB
Black Regions = 42 dB
250
200
1
s
150
16
15
14
100
12
13
50
East
11
0
CPA
50
100
150
1
3 to 8
200
9
10
2
250
250 200 150 100 50
0
50
100
150
200
250
East - West Velocity (m s 1)
Figure 34. Composite plot of estimated source direction and velocity
magnitudes for a series of M60 tank records observed by the vertical
geophone subarray.
27
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