Path: FormationFlying/Derivatives
% Compute the slope of an ellipse, dy/dx, at a particular true anomaly. Here, x is along the major axis and y is along the minor axis. This function is called by the "FFEccTrueAnomZInc" function to find the true anomaly at which the maximum cross-track separation occurs, assuming a pure inclination difference (no right ascension difference). At this true anomaly, the slope (dy/dx) of the ellipse is equal to the tangent of the argument of perigee, w. If the argument of perigee is passed as a third input, the difference between the slope and tan(w) will be returned. -------------------------------------------------------------------------- Form: dydx = FFEccDYDX( nu, e, w ); -------------------------------------------------------------------------- ------ Inputs ------ nu (1,N) True anomaly [rad] e (1) Eccentricity w (1) Argument of perigee (optional, default 0) ------- Outputs ------- dydx (1,N) Slope on the ellipse at each true anomaly -------------------------------------------------------------------------- Copyright 2004 Princeton Satellite Systems, Inc. All rights reserved. -------------------------------------------------------------------------- Since version 7. --------------------------------------------------------------------------
Back to the FormationFlying Module page