Triton Isis - Manual (Page 77)

June 2004 Isis® Sonar User's Manual, Volume 1 63
available text boxes. Table 4-1 explains the options. You can use the arrow
keys on your keyboard to scroll through the list if the values go beyond the
edges of the text box. You can modify the text in any of the boxes visible
above (including the upper left box of selected channels, by way of the
Channel Setup Edit button).
Table 4-1. Sonar information options
Option Meaning and Comments
Sonar Name This text box identifies the name of the currently selected
sonar and a short description of it.
Frequency Each channel can be set to whatever frequency, in kilohertz,
you want to use for your data survey, within the range limits
appropriate for the type of sonar you are using. The default is
100 kHz. Each channel in your channel list (top left corner)
has a frequency associated with it. If you have more than one
channel, all of the frequencies appear in the Frequency text
box, separated by commas. The leftmost frequency in the
frequency list is associated with the topmost channel in the
channel list; the next frequency is associated with the next
specified channel, and so on for the entire list of named
channels.
Horiz. Beam
Angle This is the horizontal width, or thickness, of the channel’s
beam, expressed in degrees. The default is one degree. You
can adjust the beam angle within the limits of your sonar
type. Narrower beams have greater range but yield less
resolution, and vice versa. As with the frequency list, Horiz.
Beam Angle values in the text box are listed in left-to-right
order corresponding to the named channels. Where more
than one angle is listed, they are separated by commas.
Beam Width (3dB) This is the vertical, angular spread of the channel’s beam as
measured between the half-power points. As with frequency
and horizontal beam angles, the values in the text box read
from left to right and are assigned to the named channels
listed from top to bottom.
Chapter4: Setting Up Isis to Record Data