Target Offset
Target Offsets Sub Menu:
Immediately after the Target Equipment Offsets Command is selected the Target Selection dialog box with nine radio buttons and corresponding bitmaps is displayed. To select a target click the radio button to the right of the bitmap representing that target, then click the Ok push button. To escape without changing any targets, click the cancel push button. The Target Offset dialog box allowing the user to enter the General, DVL, Reference and Depth Sensor Offsets will appear.
Target Number:
Displays the target number selected in the target selection dialog box. All changes made in the dialog box will be applied to this target number. This field is for display purposes only and can not be edited by the user.
System Units:
This edit box displays the system units. If the system units are meters the edit box will display meters. If the system units are feet, yards or nautical miles feet will be displayed in the edit box. This edit box may not be edited by the user.
General:
UWV LOA:
lows the user to enter the targets overall length in feet or meters. The maximum offset that may be entered is 100 meters/ 328 feet, the minimum amount that may be enters is 1 meter /3.28 feet. The default value which will be used if the user has not entered the targets length is 7.2 meters / 23.62 feet.
UWV Beam:
allows the user to enter the targets overall beam in feet or meters. The maximum offset that may be entered is 50 meters/ 164 feet, the minimum amount that may be enters is 1 meter /3.28 feet. The default value which will be used if the user has not entered the ships length is 2.5 meters/8.2 feet.
Latitude:
allows the user to enter the targets latitude. This is the latitude that would be used for calculating the DVL start position if manual has been selected for the DVL start position. This latitude would also be used to reset the DVL position if manual has been selected for reset position.
Longitude:
allows the user to enter the targets longitude. This is the longitude that would be used for calculating the DVL start position if manual has been selected for the DVL start position. This longitude would also be used to reset the DVL position if manual has been selected for reset position.
DVL Sound Velocity:
allows the user to have the IPS DVL sound velocity calculated from the DVL temperature and depth or calculated using the manual sound velocity.
Manual Sound Velocity:
allows the user to enter a manual sound velocity that may be used to calculate the DVL sound velocity. The maximum sound velocity that may be entered is 2000.00 m/s, the minimum is 1000.0 m/s. The IPS default is 1500.0 m/s.
Salinity:
allows the user to enter a salinity that may be used to calculate the DVL sound velocity. The maximum salinity that may be entered is 45.0 practical salinity units, the minimum is 1.0 PSU. The IPS default is 35.0 PSU. This value is only used if calculate from DVL temperature depth is selected in the DVL Sound Velocity group box. This parameter is important because the salinity of the water affects the DVL sound velocity.
DVL Start Position:
allows the user to select either manual or ship reference position as the DVL start position. The IPS default is manual.
Reset Position:
allows the user to select either the Manual, Ship Reference Position, ORE Target, Fuse DVL/USBL or Reset DVL Waypoint data position to use to reset the DVL position. The IPS default is manual.
Reset ORE Target:
allows the user to enter the ORE Target whose position will be used when resetting the DVL position. The maximum target number that may be entered is 9, the minimum is 0. The IPS default is 0. This value is only used if ORE Target is selected in the reset position group box.
Reset Lat/Lon Position:
allows the user to reset the DVL position based on the values entered above. The DVL position will be reinitialized and the data accumulaters will be set to zero. This means that the new DVL latitude and longitude will be based on data collected after the DVL position was reset.
DVL Navigation:
begins DLV navigation based on the values entered above. The positions calculated for the DVL will be shown in the display grid. If the DVL Navigation check box is not checked nothing will be done with the DVL data that is collected. The IPS default is DVL navigation off.
DVL:
DVL X:
allows the user to enter the DVL X value. The maximum offset that may be entered is 1/2 half the amount entered for target's UWV Beam the minimum amount is the negative of 1/2 the amount entered for UWV Beam. The IPS default is 0.0.
DVL Y:
allows the user to enter the DVL Y value. The maximum offset that may be entered is 1/2 half the amount entered for UWV LOA the minimum amount is the negative of 1/2 the amount entered for UWV LOA. The IPS default is 0.0.
DVL Z:
allows the user to enter the DVL Z value. The maximum offset that may be entered is 16.4 feet or 5.0 meters. The Hydrophone Z offset may be positive or negative. The IPS default is 0.0.
Mounting Angles:
this refers to the angle the DVL is mounted at relative to the navigation frame. If the DVL unit is correctly aligned with the vessal's navigation frame the mounting angle heading, roll and pitch biases would be zero. Please note the example in the DVL dialog box. In this example the DVL unit is tilted 10 degrees off the ROV/Sub level, therefore the pitch bias is 10.
Heading:
allows the user to enter the heading bias. The maximum roll bias that may be entered is 359.90 degrees. The offset may be positive or negative. The IPS default is 0.0 degrees.
Roll:
allows the user to enter the roll bias. The maximum roll bias that may be entered is 180.0 degrees. The offset may be positive or negative. The IPS default is 0.0 degrees.
Pitch:
allows the user to enter the pitch bias. The maximum pitch bias that may be entered is 180.0 degrees. The offset may be positive or negative. The IPS default is 0.0 degrees
Manual DVL Depth:
allows the user to enter a manual DVL depth that may be used in DVL calculations. The maximum DVL depth that may be entered is 4999.99 meters or 16,4004.00 feet the minimum is 0.0. The IPS default is 0.0.
Vehicle Depth:
allows the user to select either Manual DVL Depth, DVL Sensor Depth or SVP or CTD Depth to be used in DVL calculations. If Manual DVL Depth is selected, the value entered in the Manual DVL Depth edit box above will be used. The IPS default is Manual DVL Depth.
Filter DVL Data:
allows the user to set the DVL Filter on or off.
Filter Plot:
displays a popup window with a graph of the filtered DVL data.
Reference:
USBL Beacon X:
allows the user to enter the USBL Beacon X value. The maximum offset that may be entered is 1/2 half the amount entered for ships UWV Beam the minimum amount is the negative of 1/2 the amount entered for UWV Beam. The IPS default is 0.0.
USBL Beacon Y:
allows the user to enter the USBL Beacon Y value. The maximum offset that may be entered is 1/2 half the amount entered for UWV LOA the minimum amount is the negative of 1/2 the amount entered for UWV LOA. The IPS default is 0.0.
USBL Beacon Z:
allows the user to enter the USBL Beacon Z value. The maximum offset that may be entered is 16.4 feet or 5.0 meters. The Hydrophone Z offset may be positive or negative. The IPS default is 0.0.
Reference X:
allows the user to position the GPS antenna over the hydrophone by setting the reference position to the hydrophones actual position. This frees the user from having to enter hydrophone offsets into the BATS systems.
The reference position is the position displayed (lat/long) as target position in the display box in the lower right hand corner of the screen. If the reference X position is starboard of the center of the target the position must be a positive number. If the reference X position is port of the center of the target the position must be a negative number. The maximum offset that may be entered is 1/2 half the amount entered for UWV Beam, the minimum amount is the negative of 1/2 the amount entered for UWV Beam.
Note: To use the reference position a valid compass input must be supplied.
Reference Y:
If the reference Y position is forward of the center of the target the position must be a positive number. If the reference Y position is aft of the center of the target the position must be a negative number. The maximum offset that may be entered is 1/2 half the amount entered for UWV LOA the minimum amount is the negative of 1/2 the amount entered for UWV LOA.
Note: The default reference position is 0,0 the center of the target The reference position is defined to allow the user the flexibility of selecting a position onboard the target other then the locations of the actual GPS antenna and hydrophone. For example the reference position may be set to the stern of the vessel where launch and recovery of an ROV or other equipment takes place. To use the reference position valid compass input must be supplied.
Reference Z:
If the reference Z position is below the target's data center the Z the position must be a positive number. If the reference Z position is above target's data center the Z position must be a negative number. The maximum offset that may be entered is 1/2 half the amount entered for UWV LOA the minimum amount is the negative of 1/2 the amount entered for UWV LOA.
Note: The default reference position is 0,0 the center of the target. The reference position is defined to allow the user the flexibility of selecting a position onboard the target other then the locations of the actual GPS antenna and hydrophone. For example the reference position may be set to the stern of the vessel where launch and recovery of an ROV or other equipment takes place. To use the Reference position valid compass input must be supplied.
Use Ref Offsets in Processing:
allows the user to have the reference offsets entered above used in processing. The IPS default is off.
Depth Sensor:
Depth Sensor X:
allows the user to enter the Depth Sensor X value. The maximum offset that may be entered is 1/2 half the amount entered for target's UWV Beam the minimum amount is the negative of 1/2 the amount entered for UWV Beam. The IPS default is 0.0.
Depth Sensor Y:
allows the user to enter the Depth Sensor Y value. The maximum offset that may be entered is 1/2 half the amount entered for UWV LOA the minimum amount is the negative of 1/2 the amount entered for UWV LOA. The IPS default is 0.0.
Depth Sensor Z:
allows the user to enter the Depth Sensor Z value. The maximum offset that may be entered is 16.4 feet or 5.0 meters. The Hydrophone Z offset may be positive or negative. The IPS default is 0.0.