Prevent Accuracy Degradation in Indoor Positioning | Marvelmind

0:01 Hello colleagues. We just received another request about the accuracy, and it looks like it's worth drawing. So the request is the following: there is one stationary beacon, another mobile beacon, third mobile beacon, fourth mobile beacon, and the drone must be landing. And as typically, it's pretty limited in terms of distance. So this is the configuration—relatively small pad—and the drone must go up to 5 meters. To be precise, it must be something like this, and about this distance. So the question is: once again, how can we achieve the highest accuracy? How the mobile beacons or how the stationary beacons must be placed, and what will

1:06 be the inaccuracy in each direction? So again, let's draw. For example, this is the mobile beacon. Okay? Now with these dimensions, it's maybe like 2 meters or distance. In reality, it would be up to 5 meters. So when you have the base of 2 meters and 60 centimeters, then you will expect relatively small inaccuracy in this direction because you have a large base of 2 meters. And large base—and this is 3D tracking—but now I'm kind of dissecting only one axis. So this will be small, but this will be relatively large because the basis is 60 centimeters to 5 meters. So let's imagine this is 5 meters. It would be almost one to

2:08 nine. So that should mean that if you look from this perspective—okay, let's make it shorter. Oh no, no. So this is 2 meters and this is 5. So, okay, I want it back. So in this case, this will be precise, but there—and let's call this X. And if this is just—so this is 2 meters and this is 0.6 meters. So in this case, this will be small, but this will be larger. How much larger? Well, we already discussed in the previous video—very rough, not very scientific—ratio, but would be plus or minus 2 centimeters, our typical accuracy, multiplied by the ratio between the distances. In this case, the ratio would be 5 to 0.6. So it means

3:17 that you shall expect about plus or minus—okay, how many?—18 centimeters instead of 2 in this axis when the base is small. In this case, 2 to 5, it could be doubling to plus or minus 4 centimeters. But again, it's not so scientific. So it means that you shall expect spot smallest typical 2 centimeters because 2 to 5 meters ratio is still a good ratio. This is already not good ratio, but this is on the distance. If you now think about their situation when the same, but comes closer—so for example, they're landing or catching the drone. Okay, jumping, catching the drone on the distance of

4:25 one meter. What would be the accuracy in this case? Well, the accuracy in this case will be almost ideal because you will have 2 meters and 1 meter. In this case, okay, in this case you have plus or minus 2 centimeters because this is a nice triangle. And 60 centimeters will be also nice because it will be 60 base and 1 meter height. So you also expect plus or minus 2 centimeters. So your X Y will be still very good. But we also have that. So it means that in this situation, let's see—X Y will be perfect. So, okay, Y will be not okay, or at least significantly degraded. That will be okay because

5:31 the distance 5 meters is fine. No, no. Degradation is just that. So that will be okay. Y will be not okay, and X will be okay. In this—um, X. So when the height is just 1 meter, so X okay, Y okay, that okay. But what will happen when the drone will be landing? And when the drone will be landing, let's look at the same situation from the side. So this is our 2 meters, and 60 centimeters is in that direction. And the drone is landing. So the height will be whatever—20 centimeters in this case. X will be okay, very good. Y will be okay. But that—that will be terrible. Okay? Let's put it bad. Why? Now, because in this case also, please check another video that we

6:39 showed. In this case, those angles will be very uncomfortable, and the triangles will be very, very bad. So in this case, once again, X Y will be perfect, but that will be terrible. So it means that there, the simple answer: what is my accuracy will depend on where exactly they move about—they can ease—and what's your base? Will it be a kind of comfortable geometry or not comfortable geometry? So, okay, where it is okay, jump, is our comfortable geometry is when your distances—let's say not distorted—like 1, 2, 3, or something would be fine. When distances are 1 to 10, like in this case or like in this case, there will be a significantly degradation in the corresponding axis. Which one? Well, it depends on

7:49 which triangle is bad. So in this case, this is the bad triangle. In this case is this bad triangle. So in this case, your Y—X. So this will be your Y, and this will be your X, and that will be your Z. So depending on which triangle is uncomfortable, your different axes will be degraded. If anything is unclear, drop us a mail to info@marvelmind.com, and we will be happy to explain even further. Thank you very much.