# Copyright (C) 1997 Kai P. Mueller
#
# This file is part of Octave. 
#
# Octave is free software; you can redistribute it and/or modify it 
# under the terms of the GNU General Public License as published by the 
# Free Software Foundation; either version 2, or (at your option) any 
# later version. 
# 
# Octave is distributed in the hope that it will be useful, but WITHOUT 
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License 
# for more details.
# 
# You should have received a copy of the GNU General Public License 
# along with Octave; see the file COPYING.  If not, write to the Free 
# Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
 
function outsys = jet707()
  # function outsys = jet707()
  # Creates linearized state space model of a Boeing 707-321 aircraft
  # at v=80m/s. (M = 0.26, Ga0 = -3 deg, alpha0 = 4 deg, kappa = 50 deg)
  # System inputs:   (1) thrust   and (2) elevator angle
  # System outputs:  (1) airspeed and (2) pitch angle
  # Ref: R. Brockhaus: Flugregelung (Flight Control), Springer, 1994
  #
  # see also: ord2

  # Written by Kai P. Mueller September 28, 1997
  # Updates
  # $Revision: 2.0.0.2 $

  if (nargin != 0)
    usage("outsys = jet707()")
  endif
  if (nargin > 1)
    usage("outsys = jet707()")
  endif

  a = [ -0.46E-01,            0.10681415316, 0.0,   -0.17121680433;
        -0.1675901504661613, -0.515,         1.0,    0.6420630320636088E-02;
         0.1543104215347786, -0.547945,     -0.906, -0.1521689385990753E-02;
         0.0,                 0.0,           1.0,    0.0 ];
  b = [ 0.1602300107479095,      0.2111848453E-02;
        0.8196877780963616E-02, -0.3025E-01;
        0.9173594317692437E-01, -0.75283075;
        0.0,                     0.0 ];
  c = [ 1.0,  0.0,  0.0,  0.0;
        0.0,  0.0,  0.0,  1.0 ];
  d=zeros(2,2);
  inam = ["thrust"; "rudder"];
  onam = ["speed"; "pitch"];
  snam = ["x1"; "x2"; "x3"; "x4"];
  outsys = ss2sys(a, b, c, d, 0.0, 4, 0, snam, inam, onam);
endfunction