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Thread: INS system modelling
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12-11-2009, 11:44 PM #1
INS system modelling
I have a model of a DC-10 that doesn't use a flight computer but does use an inertial navigation system as the originals would. I am wondering if anyone has built a INS module for their sim.
If so, would you be willing to share some insight into what I would be facing if I wanted to try and build one myself?
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12-12-2009, 09:03 AM #2
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Re: INS system modelling
I'm not sure if you are referring to physical or software modeling of the INS unit. In our 737 cockpit there is an IRS system on the aft overhead panel. Physically, it is simply some LED's and selector switches. The software I wrote for it, models the behavior of the unit.
There are two drift layers involved:
- The first layer drifts the speed and attitude that the unit perceives. In the 737 this drift can be removed in the air with a quick alignment procedure.
- The second layer takes that perceived speed and attitude and calculates a position based on this. This drift can only be removed by a full alignment on the ground.
You simply let the code run and let the drift accumulate. Some fine-tuning is needed to get accurate drift numbers. Unfortunately, all PFD/ND packages available take their attitude and position info directly from FS, so at the moment there is no way to mess this up through the IRS.
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12-12-2009, 09:26 AM #3
Re: INS system modelling
Oh, might have been nice to have been more specific huh? I think that the software end on that model is covered. I think I'm looking at the hardware side. I found a place that sells numeric keypads so that is an option I guess. But it wouldn't have the LED numeric display.
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12-12-2009, 09:43 AM #4
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12-12-2009, 05:24 PM #5
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Re: INS system modelling
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Post Thanks / Like - 1 Thanks, 0 Likes, 0 DislikesCaptain_Eirik thanked for this post
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12-12-2009, 08:40 PM #6
Re: INS system modelling
I had not thought of that actually. Honestly it hadn't even occurred to me that such a thing would even show up.
I guess I should start haunting ebay for things like that.
I believe that this would interface by fsuipc fairly easily.
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12-20-2009, 08:14 AM #7
Re: INS system modelling
Their is another alternative beside ebay: http://www.angelfire.com/il2/aphs/forsale/forsale.html
Right now they have several INS panels:
http://www.angelfire.com/il2/aphs/msu.jpg (For integrated solutions)
http://www.angelfire.com/il2/aphs/aero.jpg (Classic INS)
http://www.angelfire.com/il2/aphs/litton.jpg (Modern pre-FMC INS)
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12-20-2009, 04:13 PM #8
Re: INS system modelling
That site is getting bookmarked! Thank you very much
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01-21-2010, 09:41 AM #9
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Re: INS system modelling
As a 727 Captain, I use my INS all the time. For the software side, see http://www.simufly.com/ins/
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01-21-2010, 04:04 PM #10
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Re: INS system modelling
There's one ending on ebay today:
http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT
Stef
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