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13. SPECIFICATIONS OF
DOPPLER SONAR DS-30
1. Measurement Range
a. Ship's Speed Bow:
Fore-aft: -10.00 to + 40.00 knots
Port-stbd: -9.99 to + 9.99 knots
Stern with optional Laser gyro, gyrocompass or ROT data:
Port-stbd: -9.99 to + 9.99 knots
b. Speed Measurement Depth
Ground tracking:1 to 200m below hull bottom
Water tracking: 3 to 25m below hull bottom
(Above figures will changed depending on installation conditions
and surrounding water conditions. The measuring accuracy will
be reduced for the depth shallower than 30 m.)
c. Current Direction: 360 degrees (Relative or True with gyro signal input)
Speed: 0.0 to + 9.9 knots
d. Current Measurement Depth
2 to 100m below hull bottom (clearance of more than 8m required)
2. Accuracy
a. Ship's Speed ・±0.2% or ±0.01 m/sec for low ship's speed ground tracking.
・±1.0% or ±0.1 knots for water tracking mode and high ship's
speed ground tracking (clearance of more than 30m).
・ ±1.0% or ±0.04 m/sec for port-stbd at stern (ship's length 400 m)
[Influence of ship 's inclination and vibration excepted. With
Laser Gyro DS-340]
・ ±1.0% or ±0.06 m/s (0.1 kt) for port-stbd at stern (ship's length
approx. 340 m)
[Influence of ship 's inclination and vibration excepted.With a
gyrocompass compatible with IMO performance standard
(ROT accuracy: 0.5º/min), receiving ROT signal less than one
sec. interval. The accuracy is dependent on the performance of
the gyrocompass.
b. Sea Depth (clearance) : ±1.0% or ±0.1m
(at 1500 m/sec of sound velocity and by converting inclined
beams to vertical, without consideration of temperature error.)
c. Distance Signal ±1.0% or ±0.1 nm
d. Current Speed ±2.0% or ±0.2 kt
NOTE 1: The speed error which results from variation of sound velocity by water temperature is
automatically compensated by water temperature measured with temperature sensor mounted on the
transducer: The salinity does not affect accuracy.