RC range simulation at ground level.
Hi,
we have performed RC range simulations for 2 systems:
35MHz, 2.5m mean antenna height, 1m receiver height (vertical mast on the UAV)
and
2.4GHz, 2m TX antenna height, 0.5m receiver height (short antennas)
in order to simulate it over a vast terrain we know and use.
The range plot was made from 4km2 elevation model made by Pix4D and Pteryx UAV.
Treat it as a kind of reminder of what happens when landing using FPV.
We know the results are valid since they match our experience
and measurements of range at several altitude levels.
We don't name the systems but mentioned RC systems are the best hobby grade you can buy off the shelf without law & power restrictions.
Things look perfect at flight altitude of 5m, but even with slightly undulated area the horror starts during touchdown, you get anything from 300m to 2km range. The area pictured is 2x2km.
Atmosferic wave diffraction is accounted for (negligible impact here).
ftp://ftp.aerialrobotics.eu/2011-05-18%20czyste/czyste1_txrange_2m.kmz
866MHz 100mW modems were tested and have shown similar range as 35MHz range at ground level (but only with huge 35MHz antenna, strictly vertical). The plot really shows where we have 95% modem bandwidth or good RC control, when overall low control latency is required: during the landing.
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Moderator Comment by Chris Anderson on December 27, 2011 at 10:49pm -
I love this. "The horror starts" is a particularly nice touch. If there was any doubt that Krys is a tech god, this should put it to rest. Respect.
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Moderator Comment by Gary Mortimer on December 27, 2011 at 11:38pm -
Yep, testing testing testing.
Not just fiddle crash blame.
I have used this http://www.qsl.net/kd2bd/splat.html
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Comment by Kamu Johansen on December 28, 2011 at 6:18am -
Is that teal-ish colour referring to no signal?
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Moderator Comment by Krzysztof Bosak on December 28, 2011 at 6:37am -
Cyan-2.4GHz rnage
Light green-35MHz range
(all at ground level, at 200m+ AGL the coverage was perfect until max range)
This is for a person standing on the highest hill in the area. There is an impression things work marginally well in narrow reception holes because receivers perform some of filtering.
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Comment by ionut on December 28, 2011 at 8:56am -
I don't understand the drawings.You superimpose 2 things.Can you plot them separately because is hard to conclude something and also can you write an conclusion?
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Moderator Comment by Krzysztof Bosak on December 28, 2011 at 9:38am -
The conclusion is that at ground level, you got RC range at maybe 20% of the area even when the land is 'flat' by eye. I have claculated what others observed.
I superimpose 2 things but it matters little, as the 35MHz area is larger than 2.4GHz coverage in all cases.
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