Displays different kinds of jitter.

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References:	French, James R. and Griffin, Michael D., Space Vehicle Design,
             American Institute of Aeronautics and Astronautics, Inc.,
             Washington, DC, 1991.

Contents

%--------------------------------------------------------------------------
%  Copyright (c) 1998-2006 Princeton Satellite Systems, Inc.
%  All rights reserved.
%--------------------------------------------------------------------------


tau = 3; % fundamental interval of control system
w   = 2*pi/tau;
t   = linspace(0,2.5*tau,1000);

for k = 1:length(t)
  % Add limit cycling
  dist1(k) = 0.1*sin(w*t(k));
  % add low-frequency white noise and bias
  dist2(k) = 0.03+0.05*(sin(w/3*t(k))+cos(w/1.5*t(k)));
  % Add jitter and high-frequency white noise
  dist3(k) = (0.03)*sin(30*w*t(k))+ randn*0.015;
end

Add desired angle

%------------------
theta = 30;

Plot

%-----
h = NewFig('Jitter Demo');
subplot(2,1,1)
plot(t,theta+dist1+dist2+dist3);
title('Pointing History')
xlabel('Time')
ylabel('Theta')
set(gca,'XTickLabel','')
set(gca,'YTickLabel','')
grid

subplot(2,1,2)
sig = std(dist3);
plot(t,dist3/sig,'linewidth',2);
title('Attitude Jitter')
ylabel('Standard Deviations')
set(gca,'XTickLabel','')
xlabel('Time')
grid

Watermark('Spacecraft Control Toolbox',h);

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% PSS internal file version information
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Published with MATLAB® R2020a