4 – Operating Procedure
DPN 402197 Issue 7.1
© Teledyne Limited
4- 7
❐
The target is out of range
❐
The 350 system cannot compute an accurate position for the target
❐
Coil saturation has occurred because the tone signal is too strong.
6. Coil altitude (ALT) information comes from an altimeter if the system includes one. Otherwise,
the information in this field will be the fixed coil height if available. The field will contain ques-
tion marks if there is no fixed height or altimeter information available.
7. DeepView calculates the target depth of cover (COV) using COV = VRT – ALT. A positive
value indicates the target is covered. Zero or negative values indicate an exposed target.
There are several conditions that will cause the field to contain question marks:
❐
The target is out of range
❐
The 350 system cannot compute an accurate position for the target
❐
Coil saturation has occurred
❐
There is no fixed coil height or information available to DeepView from an altimeter
8. The skew angle in the range -90 to +90 degrees. This field will contain question marks if the
system cannot measure skew angle. Zero skew is the ideal situation where the ROV aligns on
the same heading as the direction of the target. Skew is positive when ROV heading is to star-
board of the target direction.
9. The signal strengths, in microvolts, measured on channel 1 (starboard lateral – SL), channel 2
(starboard vertical – SV), channel 3 (port lateral – PL), channel 4 (port vertical – PV), channel
5 (starboard fore-aft – SF) and channel 6 (port fore-aft – PF).
Information included in the above signal strength fields may have a very large dynamic range,
extending from less than 1µV to more than 7 volts. To allow for simple encoding of this range, the
system displays and logs values using scientific notation:
The signal value format is: abbc where the actual value is a.bb e+c µV
For example:
❐
The field +1234 represents a value of 1.23 × 10
4
microvolts (or 12.3 mV). DeepView would dis-
play this within the Run Window as +1.23e4 in the lower left-hand data panel.
❐
The field +2416 represents a value 2.41 × 10
6
microvolts (or 2.41 volts). DeepView would dis-
play this within the Run Window as +2.41e6 in the lower left-hand data panel.
10. The QC check code provides additional status information that explains any occurrence of the QC
flag being set. The check code consists of a two-digit number in the range 01 to 07 and 99 with the
meanings defined in
Table 4-2: QC check code meaning – Survey mode
QC
Check
Code
Meaning
00
Target in range. SL and PL
50µV; LAT
±2m. Quality flag is RESET.
01
Target in range. SL or PL <50µV; LAT
±2m. Quality flag is SET.
