TCAS logic
Hi everybody,
I am working on mid-air traffic collision avoidance system like TCAS, and I have some doubts. It might seem obvious for most of you, I am sorry for that.
So in threat detection, TCAS logic is using time-to-go to the CPA. This is equal to the slante range divided by the closure rate. But I can't find what exactly is the slant range, is it the range to go to the CPA or the range between the two aircrafts? Concerning the closure rate, does it take into account both aircraft velocities, is it only the own aircraft velocity?
Another question, does anybody has heard about "horizontal or vertical miss distance" and explain me what it means?
Thank you very much for your answers,
Best regards,
Célia