Range prediction, fast fire solution.

[NavyUSA]

Originally Posted by Pisces

Oh ok, I remember having seen that drawing. Yep, in chapter 10 of some US Navy tracking training guide (Operations Specialist, Volume 1 NAVEDTRA 14308).

Not sure anymore where or how I found it. I think I can share it to all that are interested, as the frontpage says " Approved for public release; distribution is unlimited."

I guess I'll have to read that again.

Yes, the image is taken from that document.
Do you understand how to calculate simply the Br?
Just a clarification: the cited formula is fine for a single calculation of the Br, for a Br historian use the cristian's method plotting on navmap.

Now you can use the ekelund range or tables for range predictions, understand if the target range is decreasing or increasing, apply the Spiess graphical method, ecc.
The bearing rate is essential for an efficient TMA.

[Pisces]

Yes, using that picture your earlier posts start to make sense. Also the requirements for near 90 degree relative bearing. But if you use a calculator then you might as wel correct for different relative bearings.

...
Just a clarification: the cited formula is fine for a single calculation of the Br, for a Br historian use the cristian's method plotting on navmap.

I don't think you meant this one:

http://en.wikipedia.org/wiki/Cristian's_algorithm

[EDIT]Nevermind, different Cristian. You meant from the Italian forum.

[NavyUSA]

Originally Posted by Pisces

Yes, using that picture your earlier posts start to make sense. Also the requirements for near 90 degree relative bearing. But if you use a calculator then you might as wel correct for different relative bearings.


I don't think you meant this one:

http://en.wikipedia.org/wiki/Cristian's_algorithm

[EDIT]Nevermind, different Cristian. You meant from the Italian forum.

Are you kidding me?

[Pisces]

I had a brainfart for a moment. I didn't understand what Cristian method you were talking about, until I checked your earlier messages.

[NavyUSA]

For completeness, I list the procedural sequence that should be followed with the tables: (repeat for those who are interested, I can send you by email all tables for all relative bearings ad all LOS type)

Scenario: bearing-only TMA, track target with TA, ownship and target(submerged) in search phase.

i) Measure the Br at time 2 and 4. (target range is decreasing or increasing?)
ii) Recognize LOS type. (LAG, LEAD)
iii) Whit the Br measured at time 4 and relative target bearing measured at time 2 --> choose the corresponding table. (RelativeB+LOS+Br --> Table)
iv) Obtained the probable interval target range, seek a possible alignment of the points in the dotstack in the interval range. (Strip plotting)
v) If the probability is friendly, the target will not be far from the solution found. Otherwise you will fall into the 5% probability that the interval be wrong.

[Pisces]

Sure, send them. Expect a pm.

[NavyUSA]

In SH3 and SH4 though, I rely much more on the graphical methods of determining course and speed based on bearing alone. (search subsim for 3 bearing and 4 bearing method) And my self-created 3-bearing AOB finder sliderule disk. Unfortunately the drawing tools in SC and DW leave much to be desired to be able to do this effectively in the game. (no ability to plot lines on the map, only during mission editing)

Please note that "3 bearing and 4 bearing methods" are not usable, not because you can't draw lines but for other obvious reasons.