# how to plot a subject class

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vimal kumar chawda on 23 May 2019
Hello
I want to run same code 5 times with different satellite. How can I do it?
each satellite has different parameters are as below :-
function gps_(a,e,eta,omega_1,omega_2)=(26500,0.01,398600.44,0,0)
function gnss_(a,e,eta,omega_1,omega_2)=(42164.140,0,63,0,0)
function galileo_(a,e,eta,omega_1,omega_2)=(29994,0,56,0,0)
function champ_(a,e,eta,omega_1,omega_2)=(6838,0.004,87,0,0)
function molniya_(a,e,eta,omega_1,omega_2)=(26554,0.7,65,245,270)
so above 5 satellite how can I repeat 5 parameters again and again? Left hand side in brackets notation of the 5 parameters and on right hand side the value of the 5 parameters. Thank you :)
k=1;
for i=0:10:2*T
M= n *(i-0); %mean anomly
E0=M;
err=1;
while(err>10^-12)
E= M+e*sin(E0);
err=abs(E-E0); % I want to understand this step
E0=E; % eccentric anomly
end
v = 2*atan((sqrt(1+e/1-e)) *(tan(E/2))); %atan2 is not working % true anomly
r = a*(1-e*cos(E)); %distance of the satellite
r_b= [r*cos(v);r*sin(v);0] %position vector in the orbit system
r_b1(k,:)=[a*(cos(E)-e);a*(sqrt(1-(e*e)))*sin(E);0]; %position vector in the orbit system
v_b(k,:)=[-a*n*sin(E)*a/r;a*n*sqrt(1-(e*e))*cos(E)*a/r] %velocity vector in the orbit system
r_3= [cos(-fi) sin(-fi) 0;-sin(-fi) cos(-fi) 0;0 0 1]
r_1=[1 0 0;0 cos(-eta) sin(-eta);0 -sin(-eta) cos(-eta)]
r_i= r_3*r_1*r_3*r_b
r_i1(k,:)=transpose(r_i)
w_a=((2*pi)/86164)
phi=w_a*(i-0)
r_phi= [cos(phi) sin(phi) 0;-sin(phi) cos(phi) 0;0 0 1]
r_e=r_phi*r_i
r_e1(k,:)=r_phi*r_i
z_lat(k,:)= r_e1(k,3)
y_lat(k,:)=r_e1(k,2)
x_lat(k,:)=r_e1(k,1)
lat(k,:)= atan2((z_lat(k,:)),(sqrt((x_lat(k,:)*x_lat(k,:))+(y_lat(k,:)*y_lat(k,:)))))
long(k,:)= atan2(y_lat(k,:),x_lat(k,:))
r_w=[4075.53022;931.78130;4801.61819]
lat_w(k,:)=atan2(r_w(3,1),(sqrt(r_w(1,1)*r_w(1,1)+r_w(2,1)*r_w(2,1))))
long_w(k,:)=atan2(r_w(2,1),r_w(1,1))
A = [-sin(lat_w(k,:))*cos(long_w(k,:)) -sin(long_w(k,:)) cos(lat_w(k,:))*cos(long_w(k,:));-sin(lat_w(k,:))*sin(long_w(k,:)) cos(long_w(k,:)) cos(lat_w(k,:))*sin(long_w(k,:));cos(lat_w(k,:)) 0 sin(lat_w(k,:))]
r_top = transpose(A)*(r_e-r_w)
r_top1(k,:)=transpose(A)*(r_e-r_w)
S=sqrt(r_top(1,1).^2+r_top(2,1).^2+r_top(3,1).^2)
S_1(k,:)=sqrt(r_top1(k,1).^2+r_top1(k,2).^2+r_top1(k,3).^2)
zenit(k,:)=acos(r_top(3,1)/S);
Elevation(k,:)=(pi/2) -zenit(k,:)
Azi(k,:)= atan2(-r_top1(k,2),r_top1(k,1))
k=k+1;
end
fig1= plot3(r_e1(:,1),r_e1(:,2),r_e1(:,3))
fig2=plot3(r_i1(:,1),r_i1(:,2),r_i1(:,3))
pax=polaraxes;
pax.RDir = 'reverse';
fig5=plot(long_deg,lat_deg)
hold on
plot(coastlon,coastlat)
hold off
mean_r_e=mean(r_e)
closest= mean(r_e-r_w)
Thank you
Kind regards,
Vims Rocz

Show 1 older comment
vimal kumar chawda on 23 May 2019
yes, Omega_1 is same as omega1 sorry for typing errror.
function mySatelliteCode(a,e,eta,omega_1,omega_2)
I have to make my file name as mySatelliteCode. Then below changes but how it will take gps then gnss then galileo then champ then molniya. Can you please give one small example so that I can impliment over here.
like as below:-
mySatelliteCode(26500,0.01,398600.44,0,0)
mySatelliteCode(42164.140,0,63,0,0)
mySatelliteCode(29994,0,56,0,0)
mySatelliteCode(6838,0.004,87,0,0)
mySatelliteCode(26554,0.7,65,245,270)
code
but i want to differentiate by mentioning name of the satellite as well?
you can find in highlighted blue section and 5 satellite parameters as top. Currently i am having 5 different file for each satellite but want to unite it.
Thank you very much for the response.
Geoff Hayes on 23 May 2019
Then below changes but how it will take gps then gnss then galileo then champ then molniya
You call the mySatelliteCode function five times, once for each satellite.
but i want to differentiate by mentioning name of the satellite as well?
I'm not sure what you mean...where do you want the satellite name to be mentioned? In a figure? Just pass the name of the satellite as an additional parameter to your function. Then reference this parameter in your code.
vimal kumar chawda on 24 May 2019
like calling five times means
sorry sir but I didnot get you. can you please provide me an example so that i can do? how to call?
2- where do you want the satellite name to be mentioned? In a figure? Just pass the name of the satellite as an additional parameter to your function. Then reference this parameter in your code.
mySatelliteCode_gps(26500,0.01,398600.44,0,0)
mySatelliteCode_gnss(42164.140,0,63,0,0)
mySatelliteCode_galileo(29994,0,56,0,0)
mySatelliteCode_champ(6838,0.004,87,0,0)
mySatelliteCode_molniya(26554,0.7,65,245,270)
how to call this satellite parameters 5 times ?
Here I have to mention the parameters which i have mentioned in the code are as function mySatelliteCode(a,e,eta,omega_1,omega_2) so how one can do both at the same time?
thank you sir and sorry for late response I was having an exam.