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Project1_Satellite.m
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Project1_Satellite.m
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clc
clear
close all
%% Data
G = 6.673*10^(-11); %Gravitational constant
Re = 6371*10^3; %Earth Radius
Me = 5.972*10^24; %Earth Mass
w = -7.272*10^(-5); %Earth Angular Velocity
h = 0.1; %Time Interval
%% Initial Condition For Fixed Frame(X,Y,Z)
% (X) , (X_1=X': Velocity ) , (X_2=X'': Acceleration )
% (Y) , (Y_1=Y': Velocity ) , (Y_2=Y'': Acceleration )
% (Z) , (Z_1=Z': Velocity ) , (Z_2=Z'': Acceleration )
X = zeros(); X(1)=8000*10^3; %
Y = zeros(); Y(1)=8000*10^3; %% Initial Location
Z = zeros(); Z(1)=8000*10^3; %
X_1 = zeros(); X_1(1)=0; %
Y_1 = zeros(); Y_1(1)=0; %% Initial Velocity
Z_1 = zeros(); Z_1(1)=0; %
T = zeros(); T(1)=0;
X_2 = @(T,X,Y,Z) (-G*Me/(X.^2+Y.^2+Z.^2).^(3/2))*X; %
Y_2 = @(T,X,Y,Z) (-G*Me/(X.^2+Y.^2+Z.^2).^(3/2))*Y; %% Function
Z_2 = @(T,X,Y,Z) (-G*Me/(X.^2+Y.^2+Z.^2).^(3/2))*Z; %
%% Runge Kutta Algorithm For Fixed Fram(X,Y,Z)
K = zeros(1,4);
L = zeros(1,4);
M = zeros(1,4);
k = zeros(1,4);
l = zeros(1,4);
m = zeros(1,4);
d = [1,2,2,1];
n = 1;
while sqrt(X(n).^2+Y(n).^2+Z(n).^2)>Re
% FINDIG VELOCITY FROM ACCELERATION
K(1)=X_2( T(n) , X(n) , Y(n) , Z(n) );
L(1)=Y_2( T(n) , X(n) , Y(n) , Z(n) );
M(1)=Z_2( T(n) , X(n) , Y(n) , Z(n) );
K(2)=X_2( T(n)+h/2 , X(n)+h/2*K(1) , Y(n)+h/2*L(1) , Z(n)+h/2*M(1) );
L(2)=Y_2( T(n)+h/2 , X(n)+h/2*K(1) , Y(n)+h/2*L(1) , Z(n)+h/2*M(1) );
M(2)=Z_2( T(n)+h/2 , X(n)+h/2*K(1) , Y(n)+h/2*L(1) , Z(n)+h/2*M(1) );
K(3)=X_2( T(n)+h/2 , X(n)+h/2*K(2) , Y(n)+h/2*L(2) , Z(n)+h/2*M(2) );
L(3)=Y_2( T(n)+h/2 , X(n)+h/2*K(2) , Y(n)+h/2*L(2) , Z(n)+h/2*M(2) );
M(3)=Z_2( T(n)+h/2 , X(n)+h/2*K(2) , Y(n)+h/2*L(2) , Z(n)+h/2*M(2) );
K(4)=X_2( T(n)+h , X(n)+h*K(3) , Y(n)+h*L(3) , Z(n)+h*M(3) );
L(4)=Y_2( T(n)+h , X(n)+h*K(3) , Y(n)+h*L(3) , Z(n)+h*M(3) );
M(4)=Z_2( T(n)+h , X(n)+h*K(3) , Y(n)+h*L(3) , Z(n)+h*M(3) );
X_1(n+1)=X_1(n) + h/6*sum(d.*K);
Y_1(n+1)=Y_1(n) + h/6*sum(d.*L);
Z_1(n+1)=Z_1(n) + h/6*sum(d.*M);
% FINDIG LOCATION FROM VELOCITY
k(1)=X_1(n);
l(1)=Y_1(n);
m(1)=Z_1(n);
k(2)=X_1(n) + h/2*K(1);
l(2)=Y_1(n) + h/2*L(1);
m(2)=Z_1(n) + h/2*M(1);
k(3)=X_1(n) + h/2*K(2);
l(3)=Y_1(n) + h/2*L(2);
m(3)=Z_1(n) + h/2*M(2);
k(4)=X_1(n) + h*K(3);
l(4)=Y_1(n) + h*L(3);
m(4)=Z_1(n) + h*M(3);
X(n+1)=X(n) + h/6*sum(d.*k);
Y(n+1)=Y(n) + h/6*sum(d.*l);
Z(n+1)=Z(n) + h/6*sum(d.*m);
T(n+1)=T(n)+h;
n=n+1;
end
%% Initial Condition For Moving Frame(x,y,z)
% (x) , (x_1=x': Velocity ) , (x_2=x'': Acceleration )
% (y) , (y_1=y': Velocity ) , (y_2=y'': Acceleration )
% (z) , (z_1=z': Velocity ) , (z_2=z'': Acceleration )
x = zeros(); x(1)=8000*10^3; %
y = zeros(); y(1)=8000*10^3; %% Initial Location
z = zeros(); z(1)=8000*10^3; %
x_1 = zeros(); x_1(1)=0; %
y_1 = zeros(); y_1(1)=0; %% Initial Velocity
z_1 = zeros(); z_1(1)=0; %
t = zeros(); t(1)=0;
x_2 = @(t,x,x_1,y,y_1,z) (-G*Me/(x.^2+y.^2+z.^2).^(3/2) + w^2)*x + 2*w*y_1; %
y_2 = @(t,x,x_1,y,y_1,z) (-G*Me/(x.^2+y.^2+z.^2).^(3/2) + w^2)*y - 2*w*x_1; %% Function
z_2 = @(t,x,x_1,y,y_1,z) (-G*Me/(x.^2+y.^2+z.^2).^(3/2))*z; %
%% Runge Kutta Algorithm For Moving Frame(x,y,z)
A = zeros(1,4);
B = zeros(1,4);
C = zeros(1,4);
a = zeros(1,4);
b = zeros(1,4);
c = zeros(1,4);
d = [1,2,2,1];
n = 1;
while sqrt(x(n).^2+y(n).^2+z(n).^2)>Re
% FINDIG VELOCITY FROM ACCELERATION
A(1)=x_2( t(n) , x(n) , x_1(n) , y(n) , y_1(n) , z(n) );
B(1)=y_2( t(n) , x(n) , x_1(n) , y(n) , y_1(n) , z(n) );
C(1)=z_2( t(n) , x(n) , x_1(n) , y(n) , y_1(n) , z(n) );
A(2)=x_2( t(n)+h/2 , x(n)+h/2*A(1) , x_1(n)+h/2*A(1) , y(n)+h/2*B(1) , y_1(n)+h/2*B(1) , z(n)+h/2*C(1) );
B(2)=y_2( t(n)+h/2 , x(n)+h/2*A(1) , x_1(n)+h/2*A(1) , y(n)+h/2*B(1) , y_1(n)+h/2*B(1) , z(n)+h/2*C(1) );
C(2)=z_2( t(n)+h/2 , x(n)+h/2*A(1) , x_1(n)+h/2*A(1) , y(n)+h/2*B(1) , y_1(n)+h/2*B(1) , z(n)+h/2*C(1) );
A(3)=x_2( t(n)+h/2 , x(n)+h/2*A(2) , x_1(n)+h/2*A(2) , y(n)+h/2*B(2) , y_1(n)+h/2*B(2) , z(n)+h/2*C(2) );
B(3)=y_2( t(n)+h/2 , x(n)+h/2*A(2) , x_1(n)+h/2*A(2) , y(n)+h/2*B(2) , y_1(n)+h/2*B(2) , z(n)+h/2*C(2) );
C(3)=z_2( t(n)+h/2 , x(n)+h/2*A(2) , x_1(n)+h/2*A(2) , y(n)+h/2*B(2) , y_1(n)+h/2*B(2) , z(n)+h/2*C(2) );
A(4)=x_2( t(n)+h , x(n)+h*A(3) , x_1(n)+h*A(3) , y(n)+h*B(3) , y_1(n)+h*B(3) , z(n)+h*C(3) );
B(4)=y_2( t(n)+h , x(n)+h*A(3) , x_1(n)+h*A(3) , y(n)+h*B(3) , y_1(n)+h*B(3) , z(n)+h*C(3) );
C(4)=z_2( t(n)+h , x(n)+h*A(3) , x_1(n)+h*A(3) , y(n)+h*B(3) , y_1(n)+h*B(3) , z(n)+h*C(3) );
x_1(n+1)=x_1(n) + h/6*sum(d.*A);
y_1(n+1)=y_1(n) + h/6*sum(d.*B);
z_1(n+1)=z_1(n) + h/6*sum(d.*C);
% FINDIG LOCATION FROM VELOCITY
a(1)=x_1(n);
b(1)=y_1(n);
c(1)=z_1(n);
a(2)=x_1(n) + h/2*A(1);
b(2)=y_1(n) + h/2*B(1);
c(2)=z_1(n) + h/2*C(1);
a(3)=x_1(n) + h/2*A(2);
b(3)=y_1(n) + h/2*B(2);
c(3)=z_1(n) + h/2*C(2);
a(4)=x_1(n) + h*A(3);
b(4)=y_1(n) + h*B(3);
c(4)=z_1(n) + h*C(3);
x(n+1)=x(n) + h/6*sum(d.*a);
y(n+1)=y(n) + h/6*sum(d.*b);
z(n+1)=z(n) + h/6*sum(d.*c);
t(n+1)=t(n)+h;
n=n+1;
end
r = sqrt(x.^2+y.^2+z.^2);
%% Result & Plot
figure(1);plot(t,r,'.g',t,x,'.r',t,y,'.b',t,z,'.m');grid
xlabel('t (second)'); ylabel('r,x,y,z (meter)')
legend('r','x','y','z'); title('Locus - t Plot');
figure(2);plot3(X,Y,Z,'.r',x,y,z,'.g');grid
xlabel('x (meter)'); ylabel('y (meter)'); zlabel('z (meter)');
legend('Without assuming Earth rotation','Assuming Earth rotation'); title('Movement Path');
hold on
[X,Y,Z]=sphere(50);
X = X*Re; Y = Y*Re; Z = Z*Re;
surf(X,Y,Z,'facecolor',[0 1 1]);light;