SUBSIM Radio Room Forums



SUBSIM: The Web's #1 resource for all submarine & naval simulations since 1997

Go Back   SUBSIM Radio Room Forums > Modern-Era Subsims > Dangerous Waters
Forget password? Reset here

Reply
 
Thread Tools Display Modes
Old 03-30-14, 02:57 PM   #16
NavyUSA
Watch
 
Join Date: Oct 2011
Location: Los Angeles
Posts: 21
Downloads: 14
Uploads: 0
Default

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.
NavyUSA is offline   Reply With Quote
Old 03-30-14, 03:49 PM   #17
Pisces
Silent Hunter
 
Join Date: Dec 2004
Location: AN9771
Posts: 4,892
Downloads: 300
Uploads: 0
Default

Sure, send them. Expect a pm.
Pisces is offline   Reply With Quote
Old 04-07-14, 05:34 AM   #18
NavyUSA
Watch
 
Join Date: Oct 2011
Location: Los Angeles
Posts: 21
Downloads: 14
Uploads: 0
Default

Quote:
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.
NavyUSA is offline   Reply With Quote
Old 12-03-17, 03:36 AM   #19
Seppel
Nub
 
Join Date: May 2017
Posts: 4
Downloads: 33
Uploads: 0
Default

"About formula: (simple trigonometry)
With the law of sines you can calculate the angle § = arcsin( B/L*sin(w)) , w lower angle between B and bearing at time 0.
B/L << 1 therefore § is approximately equal to §* = arctan(B/L) OR §* = arcsin(B/L) [error=<10^-2] ''more easier to calculate''. In the example B is SpeedOwnship/60*2. For obtain L is sufficient bring the cursor on intersection of the bearings when the bearing appear on TMA display."

Can someone explain how i get the angle w?
Is it possibel to get the tabels for relative bearings and los typs?
Regards

Last edited by Seppel; 12-03-17 at 03:51 AM.
Seppel is offline   Reply With Quote
Old 12-03-17, 05:31 AM   #20
THEBERBSTER
Growing Old Disgracefully
 
THEBERBSTER's Avatar
 
Join Date: Dec 2012
Location: Dibden Purlieu - Southampton
Posts: 9,605
Downloads: 1123
Uploads: 0


Default

A Warm Welcome To The Subsim Community > Seppel
Subsim <> Make A Donation <> See The Benefits <> Support The Community
THEBERBSTER is offline   Reply With Quote
Old 12-03-17, 10:46 AM   #21
FPSchazly
Good Hunting!
 
FPSchazly's Avatar
 
Join Date: Apr 2014
Location: Maryland
Posts: 771
Downloads: 15
Uploads: 1


Default

Quote:
Originally Posted by Seppel View Post
"About formula: (simple trigonometry)
With the law of sines you can calculate the angle § = arcsin( B/L*sin(w)) , w lower angle between B and bearing at time 0.
B/L << 1 therefore § is approximately equal to §* = arctan(B/L) OR §* = arcsin(B/L) [error=<10^-2] ''more easier to calculate''. In the example B is SpeedOwnship/60*2. For obtain L is sufficient bring the cursor on intersection of the bearings when the bearing appear on TMA display."

Can someone explain how i get the angle w?
Is it possibel to get the tabels for relative bearings and los typs?
Regards
The part in bold is important (B/L is much less than 1). It's the small angle approximation, so you don't need "w".

What is this formula in reference to? I just skimmed this thread briefly and didn't see anything.
__________________
Your friendly neighborhood modern submarine YouTuber.

My videos:
**Exclusive Look at Modern Naval Warfare!**
Dangerous Waters Liu Doctrine (LwAmi
Learn to play Dangerous Waters
FPSchazly is offline   Reply With Quote
Old 12-05-17, 02:13 AM   #22
Seppel
Nub
 
Join Date: May 2017
Posts: 4
Downloads: 33
Uploads: 0
Default

If I understand correctly, the formula should determine a more accurate bearing rate. The formula is taken from an Italian tma manual (see link) I am looking for a decent method to get a better beraing rate, but so far without success. all self-determined beraing rates, for example, with the stopwatch are firstly inaccurate and secondly not suitable for a combat situation. other methods such as MoBo, in my opinion, ****. The general problem is the indication of opponent bearing. in all subsimgames I get, this is given as a whole number and not as a number with decimals.
We need a method with which we could determine the bearing rate relatively quickly after the first bearing. Maybe this formula is suitable? but I am still in the process of understanding them.
Best regards
Seppel is offline   Reply With Quote
Old 12-05-17, 02:53 AM   #23
Aktungbby
Gefallen Engel U-666
 
Aktungbby's Avatar
 
Join Date: Jul 2013
Location: On a tilted, overheated, overpopulated spinning mudball on Collision course with Andromeda Galaxy
Posts: 27,710
Downloads: 22
Uploads: 0


Default

Seppel!
__________________

"Only two things are infinite; The Universe and human squirrelyness; and I'm not too sure about the Universe"
Aktungbby is offline   Reply With Quote
Old 12-05-17, 09:02 AM   #24
Seppel
Nub
 
Join Date: May 2017
Posts: 4
Downloads: 33
Uploads: 0
Default

<s> mate
Seppel is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 04:45 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright © 1995- 2024 Subsim®
"Subsim" is a registered trademark, all rights reserved.