How accurate are routes on the P4?

How needs 3 satellites to find your position (actually, with three satellites there will be two points in space you could be at, but only one of those two will be on earth so just drop the unrealistic one and you have a position). The fourth GPS satellite corrects for time errors and gives us our usual degree of GPS accuracy.

Now, if we pick four of them all over the top of our heads it won't be as accurate as if we take readings from four widely displaced satellites.

And, the more satellites we have the more we can average our current position from. And looking at the center of that average helps bring accuracy to a meter. Add the onboard sensors and side to side motion is reduced to near zero. Add the barometer and you've stabilized altitude as well. VPS adds considerable more stability. But, also, add the input from the camera/gimbal system. It knows how much it had to move in any direction to keep the picture in the same place and reversing that gives us even finer positioning. Our drones are actually holding an even more precise location than the drone itself appears to now because now you have to consider the ability of just four downward thrusting propellers to adjust and how quickly.

We are using 20 satellites scattered across the sky (GPS plus GLASNOST gives a huge choice of satellites anywhere), barometer, VPS and Camera/Gimbal feedback and four computer controlled very high speed props with a great deal of thrust. That's why it stays stable.


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