Welcome to PhantomPilots.com

Sign up for a weekly email of the latest drone news & information

How precise should my hover be?

Discussion in 'Standard/4k Discussion' started by Sabalon, Mar 7, 2016.

  1. Sabalon

    Joined:
    Dec 27, 2015
    Messages:
    147
    Likes Received:
    45
    Am wondering on the P3S, just how stable my craft should be when hovering. What I noticed yesterday is that it was staying mostly in a 4'x4' box. Altitude seems to be pretty solid, but it drifts left and right, front and back.

    I did an IMU calibration on a flat surface, and a compass calibration, but it still looked a little drunk - unable to just "stand" in place. I was in P-GPS mode and had 9-11 satellites IIRC. I also swapped the props out with the unused second set that came with it. There was not any real wind at the time either.

    This was at about 6-10 feet off the ground. When I took it up to about 40' it did seem to be more stable.

    So, is this normal? If not, what steps should I take to get to the bottom of it? Not sure what I should be seeing on the sensors screen. The mod value for the compass was around 1500, which I understand is good.
     
  2. dg8882

    Joined:
    Feb 15, 2016
    Messages:
    292
    Likes Received:
    52
    Whenever I let my p3s hover, it does tend to sway a bit for me too. Mine still flys fine.


    Sent from my iPhone using PhantomPilots mobile app
     
    Squirrel! likes this.
  3. mikecorn1

    Joined:
    Jan 27, 2016
    Messages:
    200
    Likes Received:
    36
    Location:
    Richwood, TX
    My P3A does the same. Really close to the ground, 2-4ft or so it will sway some. Up higher and its rock steady. Flies just fine.


    Sent from my iPhone using Tapatalk
     
    Squirrel! likes this.
  4. Air Ontario

    Joined:
    Jan 11, 2016
    Messages:
    1,271
    Likes Received:
    493
    Location:
    U.S./ Canada
    Look at spec. sheet for your model. Likely 2.5 m horiz. in PGPS
     
  5. Sabalon

    Joined:
    Dec 27, 2015
    Messages:
    147
    Likes Received:
    45
    Didn't see a thing in there about it for the Standard, but 1.5m is what it says for the p3a,p3p and p4, so I'll call what I'm seeing within specs.

    Wish it was a little more accurate - as trying to hover along a creek bed was unnerving...but 1.5m is better than typical standard gps accuracy, so I'll live with it :)
     
  6. kirk2579

    Joined:
    Jan 13, 2015
    Messages:
    1,338
    Likes Received:
    263
    Location:
    Girard. ohio
    the lower you hover the more prop wash you will have.
    this will push the quad around as it comes back up from the ground
     
    Squirrel! likes this.
  7. Sabalon

    Joined:
    Dec 27, 2015
    Messages:
    147
    Likes Received:
    45
    I know, but those leaves aren't going to blow themselves around :)
     
  8. kirk2579

    Joined:
    Jan 13, 2015
    Messages:
    1,338
    Likes Received:
    263
    Location:
    Girard. ohio
    I can do my drive in no time!
     
    Sabalon likes this.
  9. Mark The Droner

    Joined:
    Aug 26, 2015
    Messages:
    3,973
    Likes Received:
    1,160
    Location:
    Brookeville, MD, USA
    Also, the lower your craft is to the ground (especially hovering over a creek bed), the worse your GPS mask will be. In other words, the more satellites your craft can see, the easier it is for your craft to lock into one place.
     
  10. Sabalon

    Joined:
    Dec 27, 2015
    Messages:
    147
    Likes Received:
    45
    Thanks! I didn't think about it that way. I just thought of GPS as being in the sky so as long as that's not obstructed - bit didn't think about the ones that I'd see from lower angles. Also, I assumed that if I had enough satellites that I was good to go, but was not really aware that more satellites meant more precision. Never really did much with GPS before, aside from phone directions, so haven't looked too much into the details. Hard to believe it's been around (fully operational) for only 20 years. Didn't even know that Selective Availability was no longer a thing.

    If anyone needs me, I'll be over here under this rock :)