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Mar 16, 2008, 02:51 AM
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Jack Crossfire's Avatar
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Discussion

The return of revo mixing


So the GPS satellite launched today does L1, L2 signals but no L5. There's now a choice between sonar, laser range finding, computer vision, & just waiting for better GPS accuracy.

L1:
1575.42 MHz
Satellites: Block I 1978, Block II
Completion: 1995

L2:
1227.60 MHz
Satellites: Block IIR-M 2003
Completion: 2013
Value: dual-frequency ionospheric delay correction with L1. Makes DGPS obsolete

L5:
1176.45 MHz
Satellites: IIR-20(M) June 2008, Block IIF, Block III 2013
Completion: When IIR-M satellites reach end of life and are replaced
Value: 6 dB higher power, more bandwidth, longer code, 20 dB higher power
spot beams for Calif*

3cm, fast velocity readings from carrier phase will never reach consumer level because it's not used anywhere.

Next, we have software revo mixing & software trimming. In the name of the tightest heading possible, added software revo mixing to the computer. Pumping collective is definitely a bit easier with revo mixing. It doesn't lock heading, but it greatly stabilizes the yaw. 3D masters have briefly dropped that they don't use heading hold gyros, but not often since they're paid to sell heading hold gyros.

Global equilibrium doesn't seem to work. In a very long 11min flight, she built up a positive roll to counteract strong wind. Beginning the counterclockwise turn, the positive roll should have turned into positive pitch but instead stayed a roll & moved her way way out west.

Now leaning towards a play between the IMU tilt & the equilibrium tilt.

> North-south surface gradients have been increasing after upper trough
> passage and gale force gusts are currently being reported at the
> offshore buoys.
> Winds have begun to pick up in the hills and should
> continue to strengthen at the higher elevations overnight

That's why this problem is taking a long time to track down.
Last edited by Jack Crossfire; Mar 16, 2008 at 05:09 AM.
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Mar 17, 2008, 04:35 AM
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Stuart Warne's Avatar
Jack I've seen you posting on your blog basically every day, but although what you are doing seems very complex and interesting, I'm miffed as to what it is your actually trying to achieve? Please explain is simple terms .

Stuart.
Mar 18, 2008, 08:32 AM
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>3cm, fast velocity readings from carrier phase will never reach consumer level because it's not used anywhere.
it really is - the surveying lot use it, the data-logging for motor racing uses it.....
Mar 19, 2008, 05:25 AM
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Jack Crossfire's Avatar
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This is helicopter autopilot with a twist. The heading gyro & flybar R also done in software.


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