Rank: 2788 based on 16 downloads (last 30 days) and 2 files submitted
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Luke

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Files Posted by Luke View all
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28 Sep 2007 Runge Kutta Ballistic Propagation Computes RungeKutta ballistic model propagation Author: Luke approximation, interpolation, rungekutta, ballistic, object, propagation 7 0
28 Sep 2007 Navigation Coordinate Frame Conversions Converts between navigational coordinate frames Author: Luke navigation, enu, ecef, eci, coordinate, conversions 9 3
  • 1.5
1.5 | 2 ratings
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28 Sep 2008 Navigation Coordinate Frame Conversions Converts between navigational coordinate frames Author: Luke Chiou, Jason

The way it converts velocity from ECI to ECEF is wrong. You don't use the same rotation matrix, used for converting position, to convert the velocity.
Here is what's in and what's out.

>> eci.x = 1;
eci.y = 1;
eci.z = 1;
eci.xdot =10;
eci.ydot = 10;
eci.zdot = 10;

dt =540;

ecef = ECI2ECEF( eci, dt)

ecef =

x: 1.0386
y: 0.9599
z: 1
xdot: 10.3867
ydot: 9.5993
zdot: 10

Obviously, the velocity out is wrong.
Take a look at the following page:
http://www.constell.org/Downloads/Manual-Version70.pdf

29 Nov 2007 Navigation Coordinate Frame Conversions Converts between navigational coordinate frames Author: Luke Areta, Javier

The code is given in a DLL, which from my point of view is a big minus. It would be much more useful (at least from an understanding what's going on point of view) to have it as a script. Perhaps the library call is faster, but it does not help me. Also, some comments on the code would be useful.
06 Nov 2007 Navigation Coordinate Frame Conversions Converts between navigational coordinate frames Author: Luke balzer, harry

Error undefined function or variable libpointer
on line 14 ecef to enu
Top Tags Applied by Luke
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approximation, ballistic, conversions, coordinate, ecef
Files Tagged by Luke View all
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Updated   File Tags Downloads
(last 30 days) 		Comments Rating
28 Sep 2007 Runge Kutta Ballistic Propagation Computes RungeKutta ballistic model propagation Author: Luke approximation, interpolation, rungekutta, ballistic, object, propagation 7 0
28 Sep 2007 Navigation Coordinate Frame Conversions Converts between navigational coordinate frames Author: Luke navigation, enu, ecef, eci, coordinate, conversions 9 3
  • 1.5
1.5 | 2 ratings

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