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Originally Posted by Bilge_Rat
This is how sonar works in real life:
http://www.fas.org/man/dod-101/navy/...P/snr_prop.htm
none of this is modeled in SH4 except the thermal layer. Normally, it should be harder to hear close to the surface due to temperature changes (figs.6,7 & 8), reflection of sound on the surface and the turbulence caused by the boat.
In Dangerous Waters where the Sonar is based on this model, you will normally pick up stronger sound signals as you go deeper.
In SH4, it looks like the sound model is very simple, namely contacts appear as soon as they are at a certain range with an adjustment based on whether the sub is above or below the thermal layer.
Normally you should still be able to pick up contacts at PD although not as well as if you go deeper, since the SH4 sound model appears to be a simple on/off thing, I presume it was a design decision to remove the ability to hear sound contacts at PD. |
Well done.
Yes, I remember the outcry with SH3 that sonar should not work at PD
I agree with your analysis, passive hydrophone should be functional but less effective at PD. I'm pretty sure it was standard procedure for a US sub skipper to order the planesmen to take her below PD unless he was actually using the scope (I could be wrong), to avoid broaching.
I have noticed that if you descend to 80 feet and cut your motors, you can actually pick up sound contacts that you would not be able to hear. Try it and see, you can hear the difference when the sub's motors stop. Ideally, the sound change would occur when the sub's speed nears 0 knots, but anyway, pretty neat. Also, worth noting that without forward propulsion, the sub should slowly rise or descend, depending on the state of trim, but that is probably not modeled.