Triton Isis Manual do Utilizador descarregar pdf (Página 153)

June 2004 Isis® Sonar User's Manual, Volume1

139

Notes:

• In the example shown in Figure 8-12, the values for Cable Out and

Depth (arrowed), are being received in real time over a serial port. As

these values change, the display updates automatically. The fact that

they appear “grayed out” does not mean that the values are incorrect,

simply that they cannot be changed by the operator.

• Checking the box alongside either

Cable Out or Depth allows the

operator to override the automatic value. The operator's entered value

would then be saved into the

.XTF file.

• If, for some reason, the

Depth value exceeds the Cable Out value

(perhaps a zero from the cable counter due to bad connection, or a

large incorrect depth value due to bad depth sensor) then the

Current

Value

panel will display ERROR.

• In

Playback Mode, these values will update in the same way, provided

they were recorded in the

.XTF file during the acquisition process.

Layback = sqrt{C

- (D-H)

}+ O

C= Cable Out,

D = Towfish Depth, H = Towpoint Height, and O = Offset

Calculating Layback Using “Percent of Cable Out”

In some cases it may be preferable to have Isis calculate the layback by applying

an operator-entered percentage of cable out. This method would be useful when

there is no depth sensor on the towfish or where the along-track position

difference between known objects on lines running in opposite directions can be

measured directly from a mosaic.

Clicking the radio button alongside

Percent of Cable Out changes the dialog

box to that shown in Figure 8-13:

Chapter 8: Using the View Menu

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