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haveblue1(at)mac.com
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 Posted: Mon Mar 08, 2010 6:42 pm Post subject: Inertial nav |
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Gary,
Did the F-16s you worked with back in the day use any form of inertial navigation? Reason I ask is, why hasn't someone married the accelerometers from an iPhone and developed a GPS initialized moving map package based upon inertial nav? I know that F-111s used it. OK, OK, probably hasn't been done because of money, but is it technologically feasible?
Grumman Tigers and Cheetahs with moving map inertial nav........... hmm, that's the ticket!
Bruce Smith
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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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| Posted: Mon Mar 08, 2010 8:49 pm Post subject: Inertial nav |
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Hi Bruce,
I was worked F-16 propulsion systems. The Pratt & Whitney 220/229 series engines in particular. I worked radar nav systems in B-52, KC-135s, C-141s, C-5As and HC-130s about 100 years ago when they still used tubes and magnatrons.
Gary
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_________________
Gary
AuCountry Aviation
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MikeBabin(at)AOL.COM
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| Posted: Mon Mar 08, 2010 10:39 pm Post subject: Inertial nav |
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In a message dated 3/8/2010 10:50:05 P.M. Central Standard Time, teamgrumman(at)AOL.COM writes:
| Quote: | Gary,
Did the F-16s you worked with back in the day use any form of inertial navigation? Reason I ask is, why hasn't someone married the accelerometers from an iPhone and developed a GPS initialized moving map package based upon inertial nav? I know that F-111s used it. OK, OK, probably hasn't been done because of money, but is it technologically feasible?
Grumman Tigers and Cheetahs with moving map inertial nav.......... hmm, that's the ticket!
Bruce Smith
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Bruce,
An inertial nav system requires a platform stabilized in space, plus accelerometers in the x,y,and z axis, then a computer to integrate the velocities. The iPhone could probably handle the computing, but what it lacks is the gyro-stable platform (and a third accelerometer). In a coordinated turn, the iPhone's accelerometers won't sense the turn.
It's really a moot point, because at the speeds we're talking about, WAAS GPS positional integration works about as well as an INS, both for moving maps and as a jury-rig instrument panel, (Garmin 2-3-496 et. al). No accelerometers required. The only real advantage of an INS is that it still works when the satellites die.
There are several iPhone aps that use gps to drive moving aviation charts... One of the better ones is SkyCharts.
Regards,
-Mike
[quote][b]
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