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HelicopterAerial Photography and Video › Onboard GPS and video overlay?
11-07-2005 11:10 PM  12 years agoPost 1
mwp

rrApprentice

Chatham, Ontario, Canada

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Some great work has been done by lvspark displaying onscreen waypoint guidance and other info.

His setup consists of
GPS > Processor Board > Video Overlay Board > Downlink Transmitter.

Video
http://www.rsnw.com/osdw.wmv

Original post here.
http://www.rcuniverse.com/forum/m_3335471/tm.htm

I believe he used the basic Garmin eTrex weighing 5.3oz

Interesting to see that two of the more advanced eTrex units the Summit and the Vista include a more accurate Barometric Altimeter and an Electronic Compass that could give stationary heading info when a GPS normally calculates this from the track of a moving unit.

http://www.garmin.com/products/comparison.jsp

Some GPS units don't have a data out port, some are Serial and others are USB. I understand that Serial is easy to use and USB would be a challenge in our situation. The newer color screen eTrex VistaC has USB out only.


One more project here.
http://www.rc-cam.com/forum/index.php?showtopic=757

Video from rc-cam system test.
http://www.yb2normal.com/GeckoMetersfdv1.zip


Any more downlinked GPS info or first hand experiences to share?

Thanks
Mark

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11-10-2005 06:52 PM  12 years agoPost 2
Load Factor

rrApprentice

Colleyville, Texas

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I have to say.......This is a pretty cool little unit!

Mounted to back of M1.

Example of what shows through the Eytops.


I mounted everything to the M1 so I can use different Helicopters.

The mount weighs 7lbs 2oz with Pany 150, Gyro, 2400 Poly, GPS and BW Downlink.

I use the OSD-GPS board & GPS 35-HVS (Receiver & Ant.) from
Intuitive Circuits, LLC
http://www.icircuits.com

Tanner

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11-10-2005 07:33 PM  12 years agoPost 3
Panomaniac

rrApprentice

Croatia - Adriatic coast

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Impressive, very impressive!
LoadFactor, wich product exactly are you using in your setup? What kind of GPS receiver do you have? Most of all, I am wonder is there much delay in those factors that are displayed? Are they readable and usable throught eyetop? Can you do FPV flying now?
I know... many questions, but they just come to me when i see something interesting like that

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11-10-2005 08:52 PM  12 years agoPost 4
Load Factor

rrApprentice

Colleyville, Texas

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Panomaniac,

I bought my receiver/antenna (Garmin GPS 35 - HVS) and the OSD-GPS board from http://www.icircuits.com. There is just the board and rec/ant that is needed. It is actually just an overlay board. The board connects between the video camera and the downlink.

It's a pretty new system to me so I havn't checked delay time nor correct altitude.

I fly from the ground looking at the Heli......I don't fly well through the camera.

The screen shown.......is exactly what the Eytops show.

Tanner

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11-10-2005 09:02 PM  12 years agoPost 5
mwp

rrApprentice

Chatham, Ontario, Canada

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Thanks for the reply Load Factor. Not sure how many others have tested the GPS waters. Hope they add their comments as well.

I have same Intuitive Circuits board and Garmin GPS35 almost ready for testing.

Became interested in navigating to waypoints which the GPS35 doesn’t do and possibly better altitude accuracy offered by the other GPS units incorporating a Barometric Altimeter as mentioned above in my first post.

I would like to be able to zero the altitude displayed for ease of use and set a waypoint for guidance back to the launch site for extra security.

Mark

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11-10-2005 09:13 PM  12 years agoPost 6
fitenfyr

rrProfessor

Port Orchard, Washington

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Tanner,
Did you wire that yourself?
Was it difficult?
I know very little about how to program those kinds of boards, but read instructions well.
Is this something that a basically computer and R/C type person could setup with those products?

I am looking to get something like this for our platforms by next spring.

Jason Stiffey
Fly Fast....Live Slow...

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11-10-2005 10:00 PM  12 years agoPost 7
Dakine

rrElite Veteran

OC, Commifornia

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WOW, you got up to 834 feet?

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11-10-2005 11:12 PM  12 years agoPost 8
Load Factor

rrApprentice

Colleyville, Texas

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Mark........let us know what you find out on the Altimeter.

Jason.....The process takes a little soldering skill, but fairly simple.
The devices came with excellent instructions. The most complex part was mounting the rec/antenna. The board is housed in the box on the rear of the mount (which is the next size larger than stock). Thank you Radio Shack! The board and receiver run on 12v, so I had to regulate power to my downlink via a Duralite regulator.

I think the Altimeter reads in meters. I'm checking to see if that can be changed. I did not get the WAAS GPS receiver, which is more accurate. This one seems to be +/- 5 meters.......thats over 15 feet.

I guess I'd better ask if the speed is knots or mph ..........?

There was absolutly no programming involved. It just has to find the satellites when turned on.... and that takes a minute or two.

Ohh....The Altimeter reads MSL so you have to calculate just like the big birds. Is that right? Man, I need to get back to Heli school before I forget everything!

Tony.....That was taken off there website just to give an example of the view. I'm not sure what part of the world that was taken....but if its in meters, its somewhere high.

How does your altimeter zero out sitting on the ground? Density changes?

Tanner

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11-10-2005 11:29 PM  12 years agoPost 9
mwp

rrApprentice

Chatham, Ontario, Canada

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How does your altimeter zero out sitting on the ground? Density changes?
Hi Tanner, if that was directed to me.

I was thinking that I would be possible to adjust the displayed altitude to show AGL (Above Ground Level) rather than ASL (Above Sea Level) with some manipulation of the GPS data prior to going to the overlay.

Say GPS outputs location altitude of 525 ASL (less 525 variable offset) = 0 on display prior takeoff.

In practice I would hope to have a simple set to 0 push button on the black box.

Mark

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11-10-2005 11:51 PM  12 years agoPost 10
Invertedflyby

rrApprentice

TX

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What you said of doing a variable offset would work on the salt flats but if you flew over a hill and then a valley within half a mile of each other it wouldn't compensate for that, it would only show the AGL of the takeoff point.

I think the most effective way to get live AGL data would be to get a radar altimeter and link that in to the overlay. It seems like that would be easier than using a barometric altimeter to convert what the GPS database says is MSL at ground level right below the helicopter.

I hope that makes sense.

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11-11-2005 12:29 AM  12 years agoPost 11
mwp

rrApprentice

Chatham, Ontario, Canada

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Good point Invertedflyby

No salt flats here, but quite flat just the same at about 750' ASL give or take 20'. I would be happy with the altitude referenced from the takeoff point.

Mark

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12-16-2005 05:08 AM  12 years agoPost 12
lvspark

rrApprentice

Walla Walla

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I got all the bugs worked out other than not putting new batteries in the gps before take off

I could probably do a altitude reference on mine, just have it pick up the first valid alt in the gps nema sentance and set that as zero or have a push button for manual set... A better option would be to use a baro sensor...

latest test video here http://www.rsnw.com/osdx.wmv

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12-16-2005 05:20 AM  12 years agoPost 13
Invertedflyby

rrApprentice

TX

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That was a cool video. It made me want to go flying. Thanks

Here's a link to some small radar altimeters made for UAVs.
http://www.roke.co.uk/aviation/mini...r_altimeter.asp

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12-16-2005 05:38 AM  12 years agoPost 14
HUTCH964

rrKey Veteran

Taylor,Texas 76574 local airport T74

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lvspark
OMG That was the Coolest thing I have seen to date... It sounded like a Zagi Though...

I would like to put that on my AP ship for the PILOT!!! "ME"

*****

Tim

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12-16-2005 01:19 PM  12 years agoPost 15
wesb1999

rrApprentice

Athens, Texas

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I've heard that Eagle Tree is almost finished with a video overlay unit to go with their telemetry system. When combined with the GPS addon it should be pretty slick!

Wes

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12-17-2005 02:30 AM  12 years agoPost 16
mwp

rrApprentice

Chatham, Ontario, Canada

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WOW!

lvspark

The telemetry you have working looks great!
What a fantastic view of the wind turbines from over the clouds.
Good music choice as well.

What can I say, I want one.

Are you happy with the basic eTrex GPS?

Mark

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12-17-2005 02:40 AM  12 years agoPost 17
fitenfyr

rrProfessor

Port Orchard, Washington

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Mike,
That was cool.
Now I definately need to come see you..
I have always wanted to get closer to those wind generators.

Careful you hang out with the heli guys too much and you will get a reputation.

Mike uses a form of slow stick.

Jason Stiffey
Fly Fast....Live Slow...

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12-17-2005 07:36 PM  12 years agoPost 18
lvspark

rrApprentice

Walla Walla

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There is a few good heli guys right?????

I am happy with the etrex, the refresh rate is a little slow but it does what I need it to... (get back home safe)

That flight was done with a shaker AP from http://www.rpflightsystems.com
As you can see, it is a stable flyer.....

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