User:Ziggle/Draft of TDC Notes


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! colspan="2" align="center" style="background:#90EE90;"| Torpedo Mk 14 Characteristics ! style="background:#F4A460;" width="100px"|Torpedo Type ! colspan="2" align="center" style="background:#FFDAB9;"|Physical Characteristics ! style="background:#F4A460;"|Length ! style="background:#F4A460;"|Weight ! style="background:#F4A460;"|Diameter ! style="background:#F4A460;"|Propulsion System ! style="background:#F4A460;"|Guidance ! colspan="2" align="center" style="background:#FFDAB9;"|Performance ! style="background:#F4A460;"|Speed ! style="background:#F4A460;"|Warhead ! style="background:#F4A460;"|Filling ! style="background:#F4A460;"|Range
 * width="50px"|Submarine Launched Torpedo
 * 246 inches
 * 3209 lbs
 * 21.0 inches
 * Steam Turbine
 * Air Gyro
 * 31.1 knots (low speed) 46.3 knots (high speed)
 * Mk 16 Mod 6
 * 643 lb HBX
 * 9000 yards (low speed) 4500 yards (high speed)
 * }
 * }

Position Keeper
While the submarine course and line of sight angle could be measured accurately, the target speed and course could not be measured directly and they were estimated from periscope observations. The target keeper provides a way for the fire control party to compare their estimates of current target course and speed with the position keeper's estimate based on previous estimates. Thus, through a process of observation,prediciton, and correction, the target parameter estimates were refined until the periscope readings and the position keeper's estimates agree, indicating the fire control parameters are correct. <!--
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! style="background:#DEB887;"|Parameter ! style="background:#DEB887;"|Input/Output ! style="background:#DEB887;"|Description ! style="background:#DEB887;"|Usage ! Time(Checked) ! Target Speed (Checked) ! Relative Target Bearing (Checked)
 * + Table 2: Position Keeper Critical Variables 
 * Input
 * Target position is a function of time. For the TDC to generate its target position estimates, it must know when its inputs were received.
 * Input
 * Required in the calculation of gyro angle.
 * Required in the calculation of gyro angle.
 * Input
 * Also known as the Line of Sight (LOS). Determined by periscope observation, Target Bearing Transmitter (TBT) readings, radar or sonar.

! Target Course (Angle on the Bow)(Checked) ! Target Length (Checked) ! Target Range (Checked) ! Own Course (Submarine Course) {Checked) ! Own Speed (Submarine Speed)(Checked) ! Generated Target Range ! Generated Target Bearing ! Generated Angle on Bow -->
 * Required in the calculation of gyro angle.
 * Input
 * Determined by periscope observation.
 * Required in the calculation of gyro angle.
 * Input
 * Length of the target ship.Determined using periscope observations of the target ship class. It can also be measured using the telemeter feature (a stadimeter used to measure length when range is known) of the periscope.
 * Target length is used to determine the most effective torpedo spread angle to use.
 * Input
 * Determined using the periscope's stadimeter given a known ship height, sonar, radar, or TBT.
 * Required in the calculation of gyro angle.
 * Input
 * Measured by submarine's gyrocompass.
 * Required in the calculation of gyro angle.
 * Input
 * Measured by submarine pitometer log, whose operation is based on the principals of the pitot tube.
 * Required in the calculation of gyro angle.
 * Output
 * Determined using periscope observations.
 * Fed to angle solver for generating gyro angle.
 * Output
 * Computed by the position keeper of the TDC.
 * Fed to angle solver for generating gyro angle.
 * Output
 * Computed by the position keeper of the TDC.
 * Fed to angle solver for generating gyro angle.
 * }
 * }