Tomahawk674 Posted August 16, 2006 Posted August 16, 2006 Hello everyone, I'm curious about navigation in FC. In FC, we navigate using the waypoints. Now that is not complicated but I'm curious to ask, if these planes are modeled with 80's ish technology, how does the plane determine where the waypoint are? I'm guessing that the technology that is modeled is pre-GPS. I guess you can assign a coordinate to a waypoint, but how does the plane know it's relative position to such waypoint without a GPS? I tried searching the subject, but only found info about what the navigation computer and autopilot do, but not a clue on how it operates. Anyone with knowledge mind explaining?
Zayets Posted August 16, 2006 Posted August 16, 2006 INS. They didn't needed a GPS and INS is pretty accurate. [sIGPIC]OK[/sIGPIC]
Guest IguanaKing Posted August 16, 2006 Posted August 16, 2006 The aircraft in LOMAC use Inertial Navigation, and those aircraft, to this day, are still equipped with INS. GPS is also in use now, but INS is still there.
ED Team Olgerd Posted August 16, 2006 ED Team Posted August 16, 2006 Hello everyone, I'm curious about navigation in FC. In FC, we navigate using the waypoints. Now that is not complicated but I'm curious to ask, if these planes are modeled with 80's ish technology, how does the plane determine where the waypoint are? I'm guessing that the technology that is modeled is pre-GPS. I guess you can assign a coordinate to a waypoint, but how does the plane know it's relative position to such waypoint without a GPS? I tried searching the subject, but only found info about what the navigation computer and autopilot do, but not a clue on how it operates. Anyone with knowledge mind explaining? INU (Inertial Navigation Unit) helps to do it. It's main task is to determine your aicraft position (same as GPS does) and orientation (pitch, bank, heading). INU has gyrostabilized platform with three accelerometers on it. On the ground you must enter your initial coordinates. As the aircraft starts to move, INU starts to receive the output from accelerometers. Double integration of this output gives your coordinates increments. These increments are constantly added to your initial position. That is all. [sIGPIC][/sIGPIC] К чему стадам дары свободы? Их должно резать или стричь. Наследство их из рода в роды Ярмо с гремушками да бич.
ED Team Olgerd Posted August 16, 2006 ED Team Posted August 16, 2006 The aircraft in LOMAC use Inertial Navigation, and those aircraft, to this day, are still equipped with INS. GPS is also in use now, but INS is still there. Most (if not all) USAF jets are using EGI now - Embedded GPS INS (or INU). GPS outputs are blended with INS outputs (via special filter called as 'Kalman filter'). The result is the acft position as well. [sIGPIC][/sIGPIC] К чему стадам дары свободы? Их должно резать или стричь. Наследство их из рода в роды Ярмо с гремушками да бич.
Tomahawk674 Posted August 16, 2006 Author Posted August 16, 2006 Wow, you all know too much lol. Thanks for the info.
SVK_Fox Posted August 17, 2006 Posted August 17, 2006 yep it using INS and INS is let say "accurate" if you are using some corrections and your mission is not so long :) You can read about INS on internet or also it is possible to find some books, GPS is new technology but dont be so happy it is not absolute accurate technology. I studiet it on university and I was so surprised what is behind it.
dynamocl Posted August 17, 2006 Posted August 17, 2006 Kalman filter.... shudders.... one of the items that caused me many a headache during my post grad research work. GPS (simple version) just records the time it picks up from satelites. From the time differences (I know it has a bizarre method of knowing time obtained from a weird string of digits) calculates distance from satellites, needs 4 signals to triangulate roughly, and thats roughly it. All relying on atomic clocks and synchronising clocks.
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