Too many messages

Hello everyone.
I am observing that I am receiving many messages (thousands) and very fast, with ID 344048 and 344049.
They are not planes, and the signal is very strong.
I live near an airport and I have visual line with the runway.
I suspect that this signal interferes with my actual data capture, preventing me from hearing weaker signals.
Is there any way to identify who is generating this data?

Same here. Would be nice to know what it is.

It may be test/calibration signal, or a synchronization signal for a local multilateration system.