I'm curious about Matlab's judgment criteria for satellites.

https://kr.mathworks.com/help/nav/ug/simulate-gnss-multipath-effects-on-uav-flying-in-urban-environment.html

hello,

I wrote the code after looking at the above document, and I'm curious about the satellite judgment criteria of matlab.

I understood how to calculate the signal between the platform and the uav using elevation and azimuth, but I'm wondering what satellite this is, and what are the criteria for judging it that way? I'm curious about that. Let me show you some pictures.

The picture above is the work window of allSatPos. It is determined that there are 27 satellites, so it tells you the location of the ecef for each satellite, right?

But I wonder if suddenly reading the status.LOS information using a categorical function increases it to 36 satellites. What's the Matlab criterion for this? The reason I want to know this is that I'm using this information to sort out how the signal comes into the user by color, and I want to use the values of groups because the total number of satellites and the number of satellites using a categorical function are different, so a logical error occurs.

I guess it's caused by adding the value of allSatPos and the value of normal satPos, is this correct? Then how can I find out the satellite number? I wonder about the judgment criteria of matlab.

I'm trying to deduce a few things. I need an official answer to see if this is really true. My reasoning is that allSatPos is the current number of satellites in orbit on the global scale, 27 satellites, and satPos is the actual location of the satellites that the receiver can receive, 9 satellites. We calculate with allSatPos as viewing angles for all satellites, we treat those with less than zero elevation angles or less than mask angles as blocked, and we treat satPos as included and status.LOS as true, we need answers from Matlab staff to see if this is really true. I'm curious about your ideas even if you're not an employee. Thank you.

[Steven Lord]

If you're looking for an "official answer" please contact Technical Support directly using this link. [No, I cannot answer your question; I don't work with Navigation Toolbox so I don't know the answer.]