Discrepancy between tar1090 messages/second and graphs1090 messages/second

Continuing the discussion from Can't find an answer:

In the above linked thread the OP had a discrepancy between the displayed messages/second of ~100, so roughly 4% (though it’s never stated what tar1090 was actually displaying).

I seem to have a discrepancy closer to 500 messages/second, where:

  • tar1090: ~1800 messages/second
  • graphs1090: ~1300 messages/second

So a discrepancy of roughly 30%.

tar1090

image

graphs1090

Is this still expected?

(I’m using the Ultrafeeder docker container, if that is relevant)

It looks like PiAware SkyAware agrees more closely with graphs1090, compared to tar1090.

  • tar1090: ~1350 messages/second
  • PiAware SkyAware: ~1050 messages/second
  • graphs 1090: ~1050 messages/second

Below, the tar1090 and PiAware SkyAware screenshots were taken at exactly the same time. The graphs 1090 graph was saved roughly 30 seconds later.

tar1090

Screenshot from 2023-08-20 19-54-46

PiAware SkyAware

Screenshot from 2023-08-20 19-55-13

graphs1090

Am I the only one that sees this? Is this expected?

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