Specifications

BATS AND PORTABLE BATS OPERATION
3-88
TARGET DEPRESSION ANGLE: The Depression Angle encompasses the angle starting from the
horizontal plane of the hydrophone (0 degrees) and continuing to the point directly below the hy-
drophone (90 degrees). The TARGET DEPRESSION ANGLE is the angle measured from the hy-
drophone’s horizontal plane to the target line of sight (Raw DA). (Raw Depression Angle is the de-
fault. No Pitch, Roll or Compass corrections applied. Could also be corrected – when Pitch, Roll,
Heading and Hydrophone offsets are applied. See format adjusters below within the
SENT_OUT.INI file.)
TARGET BEARING: The TARGET BEARING output in degrees is a relative bearing from the Hy-
drophone to the target (Raw BRG). (Raw Bearing is the default. No Pitch, Roll or Compass correc-
tions applied.) Could also be corrected – when Pitch, Roll, Heading and Hydrophone offsets are ap-
plied. See format adjusters below within the SENT_OUT.INI file.)
X, Y, Z: Horizontal position and depth of Target output in Meters. Cor-
rected for Compass (if “DATA O/P” is selected in Trackman program)
and also Pitch / Roll. It is also offset to the vessel’s center of gravity
when Hydrophone X, Y & Z offsets are entered. The “Z” or depth val-
ue is referenced to the water surface.
HEADING: The Compass / Gyro value (degrees) as input either via NMEA sentence (from BATS or
Trackman PC) or via the ANALOG input in BATS.
PITCH: The PITCH value (degrees) as input either via an NMEA (BATS or Trackman) or via the
ANALOG (BATS) input. 0 degrees is horizontal, a positive pitch is bow up.
ROLL: The ROLL value (degrees) as input either via an NMEA (BATS or Trackman) or via the AN-
ALOG (BATS/TP3) input. 0 degrees is horizontal, a positive roll is port side up.
TEMPERATURE: The TEMPERATURE is the value as measured at the Hydrophone by the temper-
ature sensor. In degrees Celsius. (Not used for Speed of Sound measurements.)
OPTIONAL…
SIGNAL to NOISE RATIO: This figure is the Signal To Noise ratio of the received signal in dB.
Signal is compared against the noise around the detected signal. (I.e., signal is compared against
an instantaneous noise figure rather than averaged.) If value is less than the Target’s threshold
value then target will be output with an Error Code 01. (Target default threshold is 20dB but can be
raised or lowered from the Trackman users menu.)