Spcifications Of Doppler Sonar - Furuno DS-30 Operator's Manual

13. SPECIFICATIONS OF
1. Measurement Range
a. Ship's Speed
b. Speed Measurement Depth
c. Current
d. Current Measurement Depth
2. Accuracy
a. Ship's Speed
b. Sea Depth (clearance) :
c. Distance Signal
d. Current Speed
NOTE 1:
water temperature is automatically compensated by water temperature measured with
temperature sensor mounted on the transducer: The salinity does not affect accuracy.
DOPPLER SONAR DS-30
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
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.)
Direction: 360 degrees (Relative or True with gyro signal input)
Speed: 0.0 to + 9.9 knots
2 to 100m below hull bottom (clearance of more than 8m required)
・±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 kn) 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.
±1.0% or ±0.1m
(at 1500 m/sec of sound velocity and by converting inclined
beams to vertical, without consideration of temperature error.)
±1.0% or ±0.1 NM, whichever is greater.
±2.0% or ±0.2 kn, whichever is greater.
The speed error which results from variation of sound velocity by
13-1