Solving course and speed of submarine using SONAR TMA

  • Thread starter Thread starter ottawaywf
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ottawaywf

Here we go,
I am looking for some help in writing a formula that will calculate th
course and speed of a submarine.

This is what I have to work with:

Own ship course 110, Speed 7 Knots

I have completed a formula using a received bearing to sound, receive
freqency and corrected freqency over a period of time. Using the inf
below I have computed a range of approx 24 Kyds

Time 1200, Bearing 60.0, Freq Rec 299.35, Freq Corrected 298.90
Time 1202, Bearing 57.8, Freq Rec 299.29, Freq Corrected 298.86
Time 1204, Bearing 55.4, Freq Rec 299.23, Freq Corrected 298.82
Time 1206, Bearing 52.9, Freq Rec 299.16, Freq Corrected 298.78
Time 1208, Bearing 50.2, Freq Rec 299.08, Freq Corrected 298.72
Time 1210, Bearing 47.4, Freq Rec 299.00, Freq Corrected 298.67

The Submarine has left bearing drift and Opening in range
The Submarine is in a Lag geometry (Means it is traveling in opp
direction)

Is There a means to compute Submarine course and speed with the dat
provided?

The actual Submarine course is 290, speed 10 knots at a range of 2
Kyds

Thank Yo
 
What formula are you using? How did you compute your range?

It's been a long time since I was the time-freq analyzer on my boat, but
I suspect that implementing a general solution in XL is likely to be
somewhat difficult, but not impossible.

However, IIRC, for a single leg time-freq TMA you get a range of
solutions, right?

I didn't find anything on a quick Google, but I'll have to think on it.
 
I am using two formulas for my range.

Freq range=65656*(Freq Rate*5000)/(Received Freq*Bearing Rate Sqrt)

Single Leg Bearing=1934*(Own Speed Across the Line of Sound +/- Targe
Speed Across the Line of Sound) / Bearing Rat
 
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