geometricverticalaccuracy

8 months 2 days ago #1969 by Indicator_indicator
Hi,

I am working on application that uses the geometricverticalaccuracy parameter from impala's operational_status_data4 table.

I assume geometricverticalaccuracy corresponds to the GVA parameter in ADS-B v2, encoded on 2 bits as follows:

0 - Unknown or > 150 meters
1 - ≤ 150 meters
2 - ≤ 45 meters

It seems however that historical data systematically contains "-1" values in geometricverticalaccuracy column, at least for aircraft with a good position fix (positionnac, i.e. NACp = 10).

I have only seen once a different value, namely "150", for an aircraft with a slightly degraded position fix (NACp = 8).

Should I assume that "150" correctly represents GVA = 1?

Does "-1" mean GVA = 2? If yes, what's GVA = 0? Or is there a problem with that parameter in general?

Thanks

Please Log in or Create an account to join the conversation.

Powered by Kunena Forum
This website uses cookies to offer you the best experience of our services. By using this website you agree to our privacy policy!