ikaruga Posted December 31, 2019 Posted December 31, 2019 Hi, there is an INS mode called GC. What does it do and how does it work ? Thanks in advance.
Tiger-II Posted January 1, 2020 Posted January 1, 2020 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. Motorola 68000 | 1 Mb | Debug port "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."
Rudel_chw Posted January 1, 2020 Posted January 1, 2020 +1 thanks a lot .. will try GC to check it out :) For work: iMac mid-2010 of 27" - Core i7 870 - 6 GB DDR3 1333 MHz - ATI HD5670 - SSD 256 GB - HDD 2 TB - macOS High Sierra For Gaming: 34" Monitor - Ryzen 3600 - 32 GB DDR4 2400 - nVidia RTX2080 - SSD 1.25 TB - HDD 10 TB - Win10 Pro - TM HOTAS Cougar Mobile: iPad Pro 12.9" of 256 GB
VC Posted January 1, 2020 Posted January 1, 2020 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? VC =X51= Squadron is recruiting! X51 website: https://x51squadron.com/ Join our Discord: https://discord.gg/d9JtFY4
LastRifleRound Posted January 1, 2020 Posted January 1, 2020 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.
VC Posted January 1, 2020 Posted January 1, 2020 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? VC =X51= Squadron is recruiting! X51 website: https://x51squadron.com/ Join our Discord: https://discord.gg/d9JtFY4
LastRifleRound Posted January 1, 2020 Posted January 1, 2020 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
VC Posted January 1, 2020 Posted January 1, 2020 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! VC =X51= Squadron is recruiting! X51 website: https://x51squadron.com/ Join our Discord: https://discord.gg/d9JtFY4
Tiger-II Posted January 2, 2020 Posted January 2, 2020 DCS simulates the GPS satellite orbits! Motorola 68000 | 1 Mb | Debug port "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."
AeriaGloria Posted January 2, 2020 Posted January 2, 2020 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 Black Shark Den Squadron Member: We are open to new recruits, click here to check us out or apply to join! https://blacksharkden.com
Harlikwin Posted January 2, 2020 Posted January 2, 2020 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. New hotness: I7 9700k 4.8ghz, 32gb ddr4, 2080ti, :joystick: TM Warthog. TrackIR, HP Reverb (formermly CV1) Old-N-busted: i7 4720HQ ~3.5GHZ, +32GB DDR3 + Nvidia GTX980m (4GB VRAM) :joystick: TM Warthog. TrackIR, Rift CV1 (yes really).
ikaruga Posted January 3, 2020 Author Posted January 3, 2020 A semi related question : is it possible to align INS during flight, like the Harrier ? I suppose not ...
Harlikwin Posted January 3, 2020 Posted January 3, 2020 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 New hotness: I7 9700k 4.8ghz, 32gb ddr4, 2080ti, :joystick: TM Warthog. TrackIR, HP Reverb (formermly CV1) Old-N-busted: i7 4720HQ ~3.5GHZ, +32GB DDR3 + Nvidia GTX980m (4GB VRAM) :joystick: TM Warthog. TrackIR, Rift CV1 (yes really).
Tiger-II Posted January 3, 2020 Posted January 3, 2020 (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 January 4, 2020 by Tiger-II Motorola 68000 | 1 Mb | Debug port "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."
witness_me Posted January 4, 2020 Posted January 4, 2020 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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