Download - Royal Australian Navy

74 australian maritime issues 2009: spc-a annual
Inter-War
World
War II
Post World War II/Cold War
Sonar Type
ASDIC
111/112
ASDIC
119
}
QHBa AN/SQS10
AN/SQS 4/1
AN/SQS 4/2
AN/SQS 4/3
AN/SQS 4/4
} } }
AN/SQS 29
AN/SQS 30
AN/SQS 31
AN/SQS 32
AN/SQS 23 AN/SQS 26 AN/SQS 53A-C AN/SQS 56
Frequency
(KHz)
20-50 14-26 28 20 8, 10, 12, 14 8, 10, 12, 14 4.5, 5, 5.5 3.5 2.6, 3.3 6.8, 7.5, 8.2
Power (kW) 6 4.5 10-50 4-50 60
Source
Level
(dB re 1µPa
at 1m)
209 208-218 212-218 208-218 219 235 223
Pulse
Length
(msec)
6, 30, 80 6, 30, 80
2, 7, 30,
120
2, 5, 30,
120
1000-2000 1000-2000
Reference 1 2 2 3 3 3 3 3 4 4
Table 1: Evolution of surface ship sonars from the end of WWI until the present time; surface ship echo-ranging systems have evolved
since WWI with systems that have lower operating frequencies, higher transmitted power, and longer pulse lengths. Source levels
for the QHBa, AN/SQS 10, AN/SQS 4 series, and AN/SQS 29-32 that were estimated assumed values reported in references 2 and 3
are the acoustic power, not the input electrical power. If the reported values are electrical power, then the calculated source levels
would be low. The calculation for source level is SL (dB re 1μPa at 1 m) = 171.5dB + 10log (Pwr) 26