Teledyne 440, Системное руководство, Страница: 81 / 256

5 – Operating Software
DPN 402196 Issue 4.1 © Teledyne TSS 5- 15
Features – Rear Elevation pane
The rear elevation pane is immediately below the Run Window Toolbar and occupies approximately
30% of the area with the window fully maximised. It shows the target
A as a circle of fixed diameter, a
vertical broken white line B that represents the fixed centre-line of the ROV and the two search-coil
arrays.
The circle A moves horizontally and vertically in the pane as the relative position of the target changes.
The scale D provides a visual reference so that you may estimate the vertical distance between the coil
array and the target. CTRL H switches between 30, 15, 5 and 2 metre vertical display scales.
When the 440 System includes a properly configured altimeter, the top edge of the solid grey area
shows the position of the seabed relative to the coil array. This area expands and contracts vertically
with changes in ROV altitude above the seabed. If the design of the ROV allows you to configure the
440 System with a fixed coil height, the seabed indicator will remain fixed at this altitude.
The Run Window includes a series of data fields that indicate the instantaneous measurements of coil
altitude (ALT) above the seabed
F , lateral offset (LAT) of the target relative to the centre line G , vertical
range to the target (VRT) H and target depth of cover (COV) I . The 440 System measures VRT and
LAT directly, with positive measurements of LAT representing a starboard offset relative to the centre
line. Measurements of ALT arrive from an altimeter, or represent the fixed coil height if this is
applicable. DeepView calculates the value displayed in the COV field using COV = VRT–ALT so that
positive values indicate a target that is buried. All measurement are in units of centimetres.
The solid white line J that separates the rear elevation pane from the ‘snail trail’ pane (described
below) has gradations every 1m or 5m, depending on the swath width.
Two broken red lines K extend down the window at ±2m of lateral offset. These show the lateral limits
of a quality control envelope applied by DeepView. To support efficient post-processing on data
acquired by the 440 System, the software sets the quality control flag in the data output when the target
is outside this envelope. Refer to sub-section 5.6 for a complete description of the quality control
features.
Features – ‘Snail Trail’ pane
The snail trail pane is immediately below the rear elevation pane and occupies approximately 60% of
the screen area with the window fully maximised. It indicates the lateral offset of the target, relative to
the ROV centre line
B , for the most recent updates.
Two data panels displays the Coil Voltages L and Signal Levels M . In Run mode, the Coil Voltages and
Signal Levels are measured simultaneously on the Port Forward (PF), Starboard Forward (SF), Port
Vertical (PV), Port Lateral (PL), Starboard Vertical (SV) and Starboard Lateral (SL) coils. The digital
display panel uses scientific notation to display the Signal Voltages in units of microvolts (µV).
The Signal Levels bargraphs use a logarithmic scale. The use of scientific notation and log. scales
allows strong and weak signals to be displayed simultaneously without the need to change scale. The
red dotted line on the Signal Level chart
M show the threshold (see section 5.2.3.2 "Threshold" on page
5-7 ); this is the default setting of 100µV. When the signal falls below the threshold value, the bargraph
turns red.
Features – Status bar
The status bar N , located directly below the snail trail pane, alerts you to the operating status of
DeepView and the 440 System. It includes the following information:
❐ Communication status
This shows the DeepView operating mode (Dualtrack or 440) and the validity of serial commu-