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Old Jun 01, 2010, 10:20 PM
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Aerial Photography request an Autopilot system & Ground Control Station

To own a perfect Aerial photography system may request a full autonomous Autopilot [/URL]must be with a GCS.(Ground Control Station)

In my view of point, to a certain extent the Fixed-wing may output higher quality pictures compared with Helicopter, of course the helicopter also have it advantage like the hovering position.
Here as below shown a GCS, UAVs pilot general use it on the laptop. the GCS is a software which can control your airplane with the on the ground, The airplane will be flying along the defined flight-couse automatically or the pilot can also use your mouse to point the live location for you airplane.
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Old Jun 01, 2010, 10:22 PM
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GCS for Full Autonomous Autopilot

as a some of the elements must be requested such as:

GPS receiver, integrated 3-axis MEMS gyro, 3-axis accelerometers, pressure altimeter, inertial strapdown attitude algorithm
Waypoints setting through Ground Control Station
Fail-safe Auto-return after signal interruption
Distance Automatic photography

For pilot operation
Manual remote control, /Auto balance remote control /Automatic navigation control.
ForTwo modes for Ground Control Station:
Flight Course navigation mode / Mouse pointing flight Real-time Control mode.
Theground station software contains electronic map that can change the route and tasks online,real-time semi-autonomous remote control, and can real-time record flight data and play back off-line.
Data radio system is required for long distance use and with
OSD board for First Person View would be perfect
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Old Jun 01, 2010, 10:29 PM
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Old Jun 02, 2010, 05:34 AM
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Thanks for posting this, Atflying! The FY-3ZT (along with the FY-21APII) was mentioned already in a few threads in the FPV forum here on RCG. Good to see a dedicated thread now. Keep on posting.

I have a FY-21APII en route to me from China. If it will work as advertized and I am happy with it I will look into the FY-3ZT for sure.

BTW, the Attopilot RTL is said to have now this feature: "being a 200mx800m rectangular RTL path that allows the full function abilities of the photo trigger, georeferenced of photos along the straight line of the path."

Is the FY-3ZT able to do this as well?

Miha
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Old Jun 02, 2010, 10:31 PM
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Fligt Path setting

Hi Miha

What you mentioned is about the flight path( waypoints setting) for you Airplane, is that right? just as illustrated below.

I'm not very clear about the " autopilot RTL" , but for the GCS, it has noting to do with the so called 200*800M rectangular, because the flight path is not limited to the rectangular ,just set it as you wish ,the distance between each points is depends on you demands and you airplane. so the ground control station has not restricts on it.
FYI



Wayne
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Old Jun 03, 2010, 01:16 AM
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Thanks Wayne,

yes, I understand that with the GCS it is possible to set and transmit new navpoints in real-time. For certain applications (e.g. aerial mapping) it is however more useful to generate the waypoints before flight in a systematic way e.g. in a matrix of X * Y meters with a certain stepsize. The "autopilot" should also trigger the camera shutter, so at each navpoint the camera is triggered. The "autopilot" should also log the attitude parameters at each exposure epoch so the user knows the orientation of the camera during the exposure, e.g. nadir angle, as starting parameters for the rectification process.

M.
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Old Jun 03, 2010, 08:37 AM
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Ground Control Station

Yes right
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Old Jun 27, 2010, 02:13 AM
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Quote:
Originally Posted by ~>Miha<~ View Post
Thanks Wayne,

yes, I understand that with the GCS it is possible to set and transmit new navpoints in real-time. For certain applications (e.g. aerial mapping) it is however more useful to generate the waypoints before flight in a systematic way e.g. in a matrix of X * Y meters with a certain stepsize. The "autopilot" should also trigger the camera shutter, so at each navpoint the camera is triggered. The "autopilot" should also log the attitude parameters at each exposure epoch so the user knows the orientation of the camera during the exposure, e.g. nadir angle, as starting parameters for the rectification process.

M.
Flexipilot has been designed for aerial photography and does exactly that.
It now also drives roll stabilised nose in Pteryx UAV.

There is a choice between legs spacing and altitude and for real job I think there is little that can be adjusted. For typical straight camera lens you get fixed angle of view. Then you can calulate what is neededthen fly many missions in order to discuver how often things turn out to be useless if you enlarge the spacing.
Stabilised camera mount tends to give more reliable results in the sense there are no photos more than a few degrees off, therefore even in turbulence there are rarely missed areas.

It turns out that when wants useful photo overlap (typically 60% or more is highly welcome as in panic you can even drop out a single blurred photo),
then you find yourself with 50-70m leg spacing from 200m altitude or 25-35m leg spacing from 100m altitude.

Let's analyze what does this means to various prothetic algorithms trying to get photo map during return-home.
A plane that returns home from 500m distance, should fly straight lines perpendicular to the home course. Each such line say 200m long (you expect to have at least 200x400m photo area, right?) must include additional length for turning the plane.
At the end you will have at least 450m per leg and 500/50=10 legs from 200m altitude.
End result is that a plane returning home in order to make photo mapping should travel around 4.5km at 200m altitude or as much as 9km at 100m (around 350ft) altitude. The latter is about the 15-20min endurance when getting small RC model with a camera (you must include takeoff, landing etc).
Unfortunately because of the human's ability to diagnose the real plane position on distance (from 500m) the heading error of the RTL enable position might be as much as 30deg vs intended. Supposing only 20deg error, the return home 'spinal bone' would be sin(20)*500m off target. This is 171m off. In short the furthermost leg produced (which has only 200m in this calculation) will have somewhere between 200m and 30m of length over desired area. You might want to fly longer in order to incerease hit rate, but you cannot do it easily do that with RC model.

In short this goes back to the key point:
You cannot command you plane manually on distance in order to position the plane for useful photomapping. You might obtain some results, but the best coverage will be overhead - yet this can be done by RC plane (maybe with copilot onboard) and a few lucky shots in random positions.

For photomapping, the missions usually use the platform's range to the max, lifting a lot of extra batteries etc, the end results there is no place for manual positioning.
This is exactly the same argument that rules out classic stabilised RC planes from doing photomapping.

Edit:
Of course one can extend the range to the max and just scan everything overhead within allowed visual range (500m), but that requires custom platform with huge endurance.

Edit:
concerning the GCS I think this simply decreases success rate for photomapping.
there is nothing clever you could do on the ground if the camera lens protective cover has not been removed, and the extra equipment distracting from details increases the chance of such events.
Add to this the fact that when the rain is coming you start thinking about packing your laptop right at the moment when you could let the plane fly its last 2 legs. PLus problems, broken/dirty mouse over wet surface, mosquitos, ppl trying to pick your equipment when you get 300m away from takeoff table etc. Then you find you need a second person to support just the ground station, what kills profits whichever method we use.
Plus the argument of time needed to pack/unpack.
GCS for photomapping is really a bad idea. You need this toy for interactive action: surveillance, fire support/firefighting.
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Last edited by kbosak; Jun 27, 2010 at 02:23 AM.
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