Impossible data on a military aircraft

[marc131]

Hello.
Something very curious just happened to me.

For quite some time now, I’ve been seeing this Spanish Army CASA C-295 with some impossible data.

It appears at 243 nmi, at only 3000 ft, and in an area not covered by my station.
The signal is MLAT, and I have good RSSI.

This is the first time I’ve seen it at my station.

I don’t want to reduce the maximum range since that distance is common during ducting. I receive signals from long distances, but in reasonable situations, that is, towards the sea.

The callsign keeps changing from JASON40, JASON42, BARBO41…
I’m checking it on ADSB-EXCHANGE and the same thing is happening.

ADS-B Exchange - track aircraft live

My question is, since it’s a military flight, is it transmitting false data, or what could be causing this?

[marc131]

No, that’s not it, obviously.

[obj]

Probably a shared aircraft address (hexid)
i.e. you are seeing the union of mlat positions for >1 physical aircraft in different places
(and the grace-period for mlat position feedback means you see some positions where your receiver didn’t actually contribute directly)

[marc131]

Thanks for your reply. The funny thing is, while the plane was over the center of the country, I was getting an RSSI of 17.