Options and Upgrades
4.19 Option 057, Upgrade to Transmit Pitch Stabilization
This option allows the SeaBat 8101 system to maintain a vertical transmit beam
when pitching. An external motion sensor's pitch value is required by the sonar
processor to implement the correction.
Figure 26 B illustrates the maintenance of a vertical transmit beam with up and
down pitch angles of 12°. Pitch correction is limited to ±12°. However, if the pitch
angle exceeds this value, the transmit beam's vertical angle will still be corrected,
but only to the 12° limit. Figure 26 C shows only a 5° beam displacement aft for a
total downward pitch of 17°. Conversely, an upward pitch of 17° will result in a
forward beam displacement of only 5°.
No Pitch
Pitch Up / Dn12
Pitch Down17
A
B
C
/
C
L
C
C
/
/
L
L
5
O
O
O
Figure 26, Transmit Pitch Stabilization
The pitch stabilization function employs a prediction algorithm to compensate for
the motion sensor data transmission time and setup time required in the sonar
head. Typically, pitch values are predicted approximately 60ms in advance.
Option 057 requires the installation of a replacement projector and additional
printed circuit boards in the sonar head. The sonar head must be returned to
RESON for this upgrade. If, however, the customer's schedule prohibits such a
return, the upgrade can be accomplished in the field by a RESON engineer. In
addition, a motion sensor must be connected to Serial Port 3 at the rear of the
Sonar Processor. See Chapter 6, Paragraph 6.2.1.3 for details of this port.
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SeaBat 8101 Operator's Manual
4-18
Version 3.02
