Station Demoded Data Az/El Plot with data until 2019-09-18

Bellow you can see az/el plots by https://gitlab.com/kerel-fs/satnogs-AzEl-plots script of @kerel based on @pierros initial script . Data used for these plots were extracted from satnogs-network and can be found in their csv format in this zipped file: 2019-09-18.zip (9.4 MB) .

So in this diagram you can get an idea on which Az/El a station performs good enough to demodulate data. Have in mind that the sum of data (colored areas) are shown in logarithmic scale.

Data includes one entry for each data with unique timestamp of good observations with data. This means that data frames with the same timestamp are logged once. Also it doesn’t include data from png uploads, like SSTV or NOAA ones and CW decoded frames.

There are plans to have, in the future, page with stats like that but it needs some work before that.

For the past plots check this old thread.

Thanks to all for your contributions!


Station 1


Station 2

Station 6

Station 7

Station 9

Station 10

Station 12

Station 15

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12 Likes

Impressive. Mny tnx 73 Oliver

Hi Fredy,

This is awesome!

1 Like

A free drink at OSCW to the first person who can explain why most data is received between 10° and 40° elevation :smiley:

3 Likes

your latitude 55.634 ?

Correct, it is station 49 :slight_smile:

Do you know the answer, Alex? Or is this a true mystery?

My guess would be interference from the building where the antennas are located? As the yagi’s start to point more upward you are picking up interference off the back lobe?

2 Likes

Yes, I do have an answer, or at least a good guess :slight_smile:

At your latitude, you see a lot of satellites low on the horizon, is that it?

1 Like

I would say due to the fact that most satellite passes are in that range of elevation (assuming cut off at 10 for horizon).

It is logical to assume that if we do a graph for satellite occurrence per elevation it would be approximating an cumulative exponential distribution.

3 Likes

It’s the combination of distance and angular velocity. The angular velocity determines how long a satellite stays within a certain elevation range. Though the distance is smaller near zenith, the angular velocity is higher, so the satellite spends less time there. At very low elevations more time is spent there, but the distance is too far and hence the SNR to decode is lower.

8 Likes

Indeed, this is what I have been thinking too! You win!

That’s a good point, although, in such a case, I would expect the yellow band to be less symmetric in Azimuth. However, this is likely a contributing factor, so you get a drink too :grin:

1 Like

This really helps my research on The Effects of Hyacinth Bean Vine on Moxon Takeoff Angles.

5 Likes