If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
IGC File / Flight-track Analysis
Hi All,
I'm working on a project that I can't talk about much, but I was hoping to prevail upon some experts here. I need to analyze some IGC files in my project, and try to use the data to determine the behavior of the glider. As I understand it, the bulk of the IGC file is just a series of time- stamped position & altitude fixes. So to determine an aircraft's heading (ground-track to be more precise, since we're referencing GPS coordinates), I have to use pairs of position-fixes to come up with a direction & velocity vector... Yes? OK, now here's where it gets a little tricky: How to I make the leap from those raw vectors to determining behavior? For example, you can signal your release from tow by executing a sharp 360-degree turn. Its easy enough to look at a few vectors in a row and as long as they keep angling off to the same side (relative to the previous vector) then I can consider the glider in a continuous turn. As long as the continuous turn takes us past 360 degrees from the ground-track/ heading at the beginning of the turn, we're OK - right? But what happens if the glider catches a gust of wind that slews the tail momentarily or causes the glider to slip? What is my "fudge factor" for these things and how do I reasonably account for them? There are some other oddities that I'm unsure how to account for (or if I even need to) - like: How do I deal with a wind-drift that's causing the glider's absolute position to be offset? I'm a programmer & IT person by day, but my work is keeping me terribly busy and I've never had to do much in terms of pathing or vector analysis - so this stuff is harder for me than it should be right now. :-P Any help would be much appreciated! Thanks, take care, --Noel |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Flight Analysis with NMEA GPS Data File | jchutch | Soaring | 4 | May 12th 08 02:26 AM |
Regarding Analysis | Nag | Home Built | 3 | April 21st 06 11:02 PM |
Polar Analysis from flight logs? | Mark Zivley | Soaring | 87 | January 13th 05 12:34 AM |
Oil Analysis | PaulaJay1 | Owning | 3 | March 16th 04 04:25 PM |
Oil Analysis | PaulaJay1 | Owning | 11 | November 11th 03 01:29 AM |