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  1. TheCholla

    Sitrec Wind

    Safe to say including wind makes a lot of difference. Quick illustration: The "ideal" flying-away jet scenario. No wind, 31Nm, for constant speed. Not very straight, but tail angle more or less consistent with a jet flying away. Now with 346-heading 120 Knots wind. Picked objectively based...
  2. TheCholla

    Sitrec Wind

    What would make sense, and this is what the documentation says: - Az : relative to ground track - Situational Awareness cue dot : relative to plane boresight
  3. TheCholla

    Sitrec Wind

    Great additions, lots of things to analyze when playing with the wind. Based on the audio ("going against the wind"), and the fact they are sure they were tracking an object within 10Nm, (based on what R. Graves and the WSO, indirectly, has said), this constrains the local wind direction. We...
  4. TheCholla

    Calculating and visualizing Gimbal angles.

    Yes but a larger error has to pass by 2.5deg, so the algorithm you suggest would activate pod roll every time the errors goes beyond 2.5deg (making faster steps). Unless it considers how fast the deviation goes above 2.5deg, and activate pod roll when the internal system can't catch up...
  5. TheCholla

    Calculating and visualizing Gimbal angles.

    So the hypothesis is that the Navy had their ATFLIR pods designed to roll in steps every 2.5deg motion of the internal gimbal axes. Not only at singularity, but every time pod roll is needed. I'd be curious to see a faster-than-Gimbal moving target crossing the FOV. This must induce bumps and...
  6. TheCholla

    Calculating and visualizing Gimbal angles.

    Maybe a stupid question, but do you think the radar data influences the pod in any way? Could it be that the pod had this unusual behavior because of it was tracking an object with an unusual flight path. I'm thinking, if the FLIR "knows" the object is going slow or being stationary, maybe it's...
  7. TheCholla

    Which Gimbal scenario is more likely — 30 NM or 10 NM?

    That's why I made the 1st image with perfecty flat clouds, to check if we see the jump there too.
  8. TheCholla

    Which Gimbal scenario is more likely — 30 NM or 10 NM?

    @Mick West , no comment? A closer look at what's going on at the key moment between 26 and 30s A small jump in the FOV, that can also be seen in this stitched panoramic view. This would be quite a turbulence for a leveled distant plane at 30-40Nm.
  9. TheCholla

    Which Gimbal scenario is more likely — 30 NM or 10 NM?

    It seems these wiggles in heading are about 4° for the 31Nm path, ~10° for the 38Nm path. A plane going straight doesn't do that. What do you think of the cloud motion speed and do you agree with my measurements above?
  10. TheCholla

    Which Gimbal scenario is more likely — 30 NM or 10 NM?

    I copy what I posted in another thread, the clouds are also to slow compared to the real vid. This is the problem with basing everything on how the clouds look, it's hard to see how exactly angular motion matches. But it has to be done, here looking at how many frames it takes to span one FOV...
  11. TheCholla

    Which Gimbal scenario is more likely — 30 NM or 10 NM?

    We don't really see what's going on in your screenshots. A straight trajectory of a distant plane should not be that hard to find, with all the refinements that have been made. Yet, straight-line trajectories, at 31Nm and 38Nm, look like this: 31NM...
  12. TheCholla

    Some Refinements to the Gimbal Sim

    Just FYI Mick, I have the same problem with the Gimbal sim and Sitrec. It's great there is so much stuff but it's very laggy on my laptop.
  13. TheCholla

    Some Refinements to the Gimbal Sim

    No, but he's on LinkedIn, maybe he could be contacted there.
  14. TheCholla

    Some Refinements to the Gimbal Sim

    If one wants to explain all the bumps by pod roll, this error angle graph does not explain the bump at 1s (error peak occurs before 1s), and the model predicts a bump at 10s that does not happen. I'm intrigued by this step-rotating pod. First because I don't see how it put less constraint on...
  15. TheCholla

    Some Refinements to the Gimbal Sim

    What version should we use then, the new one? Also, what is the "Scale jet pitch with roll" option?
  16. TheCholla

    Which Gimbal scenario is more likely — 30 NM or 10 NM?

    Entropy is very interesting, but how it is relevant to the case here, I'm not sure. I'll note two things : - the close trajectory was seen on SA, to go with your analogy it's like if you have an employee from the card factory telling you he's seen somebody shuffling the cards out of the...
  17. TheCholla

    Which Gimbal scenario is more likely — 30 NM or 10 NM?

    I understand your position, but like I said in the other thread, you're going all in with the distant projection giving a definite answer. Personally, with the witness accounts and SA data being left unexplained, and the very unclear set of circumstances for locking on a random plane at 35Nm (in...
  18. TheCholla

    Which Gimbal scenario is more likely — 30 NM or 10 NM?

    Why limit to the horizon? They could have looked at a large range of elevation if they were looking for their weird radar return. Most planes fly higher than 25000ft and would have been above them. You need a plane at 19000ft, which is not super common. How many planes fly at 19000ft, 300 miles...
  19. TheCholla

    Which Gimbal scenario is more likely — 30 NM or 10 NM?

    I'm going to repost this message here, because I think it's an interesting question. We were debating with @Mendel about the distant flight path, and got there, but off-topic unfortunately. Now it's directly related to the question of this thread, about the probability of the distant versus...
  20. TheCholla

    Why does the Gimbal shape change?

    About all your rambling on the L+S, Graves addressed it on Twitter : Source: https://twitter.com/uncertainvector/status/1395401310502014981?s=20&t=O7jDfMMTzasn2pCAhRWh9Q That you don't believe him is your call, but he addressed it.
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