Hello,
I'm currently doing a small project, where I'm reading raw ADS-B data from a RadarCape looking for the positions messages containing GNSS heights (not barometric). These kind of messages have a special subtype (tc:20-22), where a position with barometric height is 9-19. I'm currently not receiving any messages with GNSS heights to my disappointment.
So, I was wondering how FR24 calculates GPS heights of aircrafts, or atleast what this data is based of?
I'm currently doing a small project, where I'm reading raw ADS-B data from a RadarCape looking for the positions messages containing GNSS heights (not barometric). These kind of messages have a special subtype (tc:20-22), where a position with barometric height is 9-19. I'm currently not receiving any messages with GNSS heights to my disappointment.
So, I was wondering how FR24 calculates GPS heights of aircrafts, or atleast what this data is based of?
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