Simrad EY 500
10
P3403E/A
3
U
'
m
9
3
W
*
10
& U
4
U
2
M
M
9
10
& U
4
U
2
2
4
* G9
(12)
3
U
'
3
W
10
& U
4
U
2
M
M
9
10
& U
4
U
2
2
4
F
2
U
2
m
4
*
2
G
(13)
m
4
*
2
G
'
*
2
0
(14)
6
Y
'
M
/
M
Y
4
U
2
0
'
3
U
32
2
3
W
*
2
0
U
2
0
2
F
U
2
10
2
U
(15)
10log(
6
Y
)
'
10
OJ
(
3
U
)
%
10
OJ
(
U
2
10
2
U
)
&
10
OJ
(
3
W
*
2
0
U
2
0
2
F
32
2
) (16)
Having established the basic power budget equation for point backscattering,
the extension to volume backscattering is straightforward. Whereas scattering
from a small object is characterized by its backscattering area, the scattering
from a homogeneous volume is characterized by the backscattering area per unit
of water volume,
M
F
/
M
V. The equation for received power becomes (equation 12):
where
M
F
/
M
VdV is the backscattering area is from the small volume dV and
where integration includes all volume V contributing to the received signal at
a particular instant.
With a pulsed transmitter the volume V corresponds to a sphere of thickness
c
J
/2 where c is the propagation speed in water and
J
is the transmit pulse
duration. Thus, the three-dimensional integration over V can be replaced by a
two dimensional integration over all solid angles 4
B
(dV =½c
J
r
2
d
S
), equation 13:
The equivalent two-way solid beam angle
Q
is a key transducer parameter and
is defined (equation 14):
where G
0
is the peak gain. Introducing this definition, rearranging the terms
and normalizing with respect to r
0
the expression for volume backscattering
strength becomes (equation 15):
Again, the EY 500 implements a logarithmic version of this equation (equation
16):
Thus, volume backscattering strength is obtained by adding a range dependent
term (corresponds to 20-log-r TVG) and a constant to the received signal power.
The quantity 10log(S
v
) is used by many of the internal algorithms of the
sounder; S
v
echogram generation, echo integration, bottom detection etc.
Содержание EY500
Страница 1: ...6LPUDG 3RUWDEOH VFLHQWLILF HFKR VRXQGHU...
Страница 2: ......
Страница 20: ...System familiarization 14 P3400 B...
Страница 44: ...Operation 10 P3402 C Blank page...
Страница 52: ...Operation 18 P3402 C Blank page...
Страница 53: ...Simrad EY 500 P3402 C 19 Figure 4 Scope plot showing 300 samples of transceiver data...
Страница 140: ...Simrad EY 500 20 P3403E A...
Страница 164: ...Maintenance Figure Transceiver with PC...
Страница 165: ...500 senes echo sounders Vlew transceiver...
Страница 166: ...Maintenance Figure interconnection...
Страница 170: ...Maintenance Figure...
Страница 174: ...Maintenance...
Страница 179: ...500 series portable echo sounders Figure tra nsce i ver...
Страница 183: ...500 series echo sounders power...
Страница 185: ...500 series portable echo sounders...
Страница 209: ...Simrad EK 500 EY 500 P2260 E 7 WINCH 2 WINCH 3 WINCH 1 CD481 Figure 1 Rigging of a vessel for sphere calibration...
Страница 224: ...Calibration 22 P2260 E Figure 8...
Страница 225: ...Simrad EK 500 EY 500 P2260 E 23 Figure 9...
Страница 232: ...Calibration 30 P2260 E Blank page...
Страница 234: ...Calibration 32 P2260 E Blank page...
Страница 239: ......
Страница 240: ......
Страница 241: ......
Страница 242: ......
Страница 243: ......
Страница 244: ......
Страница 245: ......
Страница 246: ......
Страница 247: ......
Страница 248: ......
Страница 249: ......
Страница 250: ......
Страница 251: ......
Страница 252: ......
Страница 253: ......
Страница 254: ......
Страница 255: ......
Страница 256: ......
Страница 257: ......
Страница 258: ......
Страница 259: ......
Страница 260: ......