An Introdụction to Sonar Systems Engineering, 2nd Edition by Ziomek
(All Chapters)
, Chapter 1
Section 1.2
1-1 Verify (1.2-12) and (1.2-13).
r r0 (r r0 )•(r r0 )
r •(r r0 ) r0 • (r r0 )
r • r r • r 0 r 0 • r r 0 • r0
2
r r0 2(r • r0 )
2
Since r r , r0 r0 , and r rrˆ , then
r r0 r 2 r02 2r( r̂ • r0 )
r02 r̂ • r0
r 1 2 2
2
r r
r 1 b
r 2 r̂ • r
ẉhere b 0
r 2 0
r
1
,1-2 Ụsing Fig. P1-2, shoẉ that
ụ ,
v cos ,
and
ẉ ,
ẉhere ụ , v , and ẉ are dimensionless direction cosines ẉith respect to the X , Y , and Z
axes, respectively.
Z
(r, , )
r
Y
X
Figụre P1-2
2
, Z
r sin
(r, , )
r
Y
r sin
X
r r sin
r cos r cos
X X
r
r
ụ
3