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junzis / the-1090mhz-riddle

The book about decoding Mode-S and ADS-B data
http://mode-s.org
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Wrong sign in the vertical rate formula #52

Closed ajuch closed 3 years ago

ajuch commented 3 years ago

Hi,

I implemented some decoding functions based on your great book but I noticed that the formula of the vertical speed (7.1) has the wrong sign. The formula is written as VS = (2S_vr - 1) * 64 * (V_r - 1) but this conflicts with the meaning of S_vr = 0 is climb. Also the examples 7.2 and 7.3 have this mistake.

Br, Andreas

junzis commented 3 years ago

Hi @ajuch, you are correct. The formula should be (1 - 2 Svr) x 64 x (Vr -1). I will update this in a new commit.

junzis commented 3 years ago

fixed with updates equations now.