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Posted

GC = Great Circle. It's an alignment mode.

 

When you start the INS, after you have entered STBY and the alignment position, you can set it to FAST or NAV. NAV during align will also set FAST mode for alignment.

 

During FAST mode alignment it is necessary to enter the current aircraft true heading, in order that the gyro platform can correctly align with true north.

 

In GC mode, the alignment takes much longer. As well as erecting the gyro platform as FAST does, GC measures the Earth's rotational acceleration and gravity for platform alignment.

 

In this instance, the platform can automatically determine true north, and thus the current aircraft true heading, by using the INS accelerometers to sense the Earth's rotation.

 

You will note in GC mode you do not enter a true heading.

 

FAST will not result in as good alignment as GC. It however would suffice if your base is under attack and you need to get flying quickly.

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Posted

+1 thanks a lot .. will try GC to check it out :)

 

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Posted

Interesting, I thought this wasn't implemented yet. The question is, as far as I can tell everything works using FAST, why would you wait for GC? You say alignment is better but is this actually relevant to anything in DCS at the moment?

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Posted
Interesting, I thought this wasn't implemented yet. The question is, as far as I can tell everything works using FAST, why would you wait for GC? You say alignment is better but is this actually relevant to anything in DCS at the moment?

 

This is likely due to correctional GPS coupling. I wonder if the INS error is more notcible if FAST is used and HNS is left to INS only.

Posted
This is likely due to correctional GPS coupling. I wonder if the INS error is more notcible if FAST is used and HNS is left to INS only.

 

That makes sense, I've never touched the HNS, I assume it defaults to both? Is GPS coverage modelled in DCS or do we basically have it everywhere all the time?

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Posted
That makes sense, I've never touched the HNS, I assume it defaults to both? Is GPS coverage modelled in DCS or do we basically have it everywhere all the time?

 

Unless you specify a fault with aircraft's GPS reciever or related systems GPS is omnipresent in DCS.

 

HNS defaults to INS only on cold start, but defaults to INS+GPS on a hot start

Posted
Unless you specify a fault with aircraft's GPS reciever or related systems GPS is omnipresent in DCS.

 

HNS defaults to INS only on cold start, but defaults to INS+GPS on a hot start

 

Thanks, good to know! One more thing to add to my startup procedure then!

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Posted

DCS simulates the GPS satellite orbits!

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"When performing a forced landing, fly the aircraft as far into the crash as possible." - Bob Hoover.

The JF-17 is not better than the F-16; it's different. It's how you fly that counts.

"An average aircraft with a skilled pilot, will out-perform the superior aircraft with an average pilot."

Posted

I’ve heard however that signal quality is always 100%, but there is support for variable quality as constellations change since Blackshark. Would be really cool to have GPS jamming in game

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Posted

Yeah I was shocked to learn that GPS was actually modeled to this degree of fidelity in the game. Its crazy whats modeled well vs badly vs not at all in DCS.

 

And yeah, agreed GPS jamming would be interesting.

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Posted

It might be possible. IFA has been around long enough that its not that exotic of a tech. But I have no actual documentation on the JF17

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Posted (edited)

I don't think so. It requires an actual air alignment mode which the -17 doesn't appear to have.

 

If the INS "topples" you lose it completely for the rest of the flight. GPS should back it up.

 

SAHRS (Super Attitude and Heading Reference System) provides attitude data so INU is not used for this, hence no ATT (Attitude) mode.

 

EDIT: I wonder what makes SAHRS different from AHRS?

Edited by Tiger-II

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"When performing a forced landing, fly the aircraft as far into the crash as possible." - Bob Hoover.

The JF-17 is not better than the F-16; it's different. It's how you fly that counts.

"An average aircraft with a skilled pilot, will out-perform the superior aircraft with an average pilot."

Posted
A semi related question : is it possible to align INS during flight, like the Harrier ? I suppose not ...

 

 

in the ufcp there's a button labelleed "PU" - supposedly does that

 

 

i have to admit i'm lazy though and avoid cold starts where possible, so haven't really tested it myself :D

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