-
Notifications
You must be signed in to change notification settings - Fork 0
/
NAVIGATION.m
130 lines (126 loc) · 4.42 KB
/
NAVIGATION.m
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
[n1,n2]=uigetfile('*.txt','Select Export matches');
T=strcat(n2,n1);
T=readtable(T);
format long g
%%=====================================================
Data=T.Var2;
Data(14:14:end)=[];
Data=reshape(Data,[],31);
e=Data(3,:);
t0=Data(4,:);
i=Data(5,:);
Rate_of_Right_Ascen=Data(6,:);
a=Data(7,:).^2;
Right_Ascen_at_Week=Data(8,:);
Argument_of_Perigee=Data(9,:);
Mean_Anom=Data(10,:);
GM=3.986004418e14;
we=7.2921151467e-5;
%----------------------DATUM------------------------
% WGS-84(1984)
A=6378137; B=6356752.3142; E2=(A^2-B^2)/(A^2);
% h=input('input h = ');
phi=input('input phi d= ');
Landa=input('input Landa d= ');
t=([phi;Landa]).*pi/180;
phi=t(1,1);LAndA=t(2,1);PP=phi;LL=LAndA;
%---------------Ex------------------------------
h=0;
% phi=32*pi/180;LAndA=51*pi/180;
%------------------------------------------------
N=A^2/sqrt(A^2*cos(phi)^2+B^2*sin(phi)^2);
X_CT=(N+h)*cos(phi)*cos(LAndA);
Y_CT=(N+h)*cos(phi)*sin(LAndA);
Z_CT=(N*(B^2/A^2)+h)*sin(phi);
%---------------------------------------------------
% Greenwich True Sidereal Time at Longitude 0.0°
% 13h 43m 30.759s = 13.7252107292 h
GAST=205.8781609381*pi/180;
xp=0;yp=0;
S=Rotation(2,-xp)*Rotation(1,-yp)*Rotation(3,GAST);
%---------------------------------------------------
ch=menu('','SKYPLOT','PRNJ GROUND TRACK')
switch ch
case 1
Day_of_week=input('input Day_of_week =')-1;
T1=input('input start time =')*3600+Day_of_week*24*3600;
T2=input('input End time =')*3600+Day_of_week*24*3600;
t=T1:20:T2;
for j=1:31
tk=t-t0(j);
Mk=Mean_Anom(j)+(sqrt(GM/a(j)^3) ).*tk;
omegak=Right_Ascen_at_Week(j)+(Rate_of_Right_Ascen(j)-we).*tk-we.*t0(j);
w=Argument_of_Perigee(j);
E0=Mk;
for iii=1:5
Ek=Mk+e(j)*sin(E0);
E0=Ek;
end
Ek=wrapTo2Pi(Ek);
r_orb=[a(j)*(cos(Ek)-e(j));a(j)*sin(Ek)*sqrt(1-e(j)^2);zeros(1,max(size(Ek)))];
r=Rotation(1,-i(j))*Rotation(3,-w)*r_orb;
r_ct=[];
c=[];
for k=1:max(size(Ek));
r_ct(:,k)=S*Rotation(3,-omegak(k))*r(:,k);
end
dr=r_ct-[X_CT;Y_CT;Z_CT]*ones(1,k);
for k=1:max(size(Ek));
c(k)=norm(dr(:,k));
end
r_LA=[1 0 0;0 -1 0;0 0 1]*Rotation(2,phi-pi/2)*Rotation(3,LAndA-pi)*dr;
Az=atan2(r_LA(2,:),r_LA(1,:));
v=asin(r_LA(3,:)./c);
Az=Az(find(v>0))*180/pi;
v=v(find(v>0))*180/pi;max(v);
v=-v./90 +1;
hold on
plot(v.*sind(Az),v.*cosd(Az),'.')
end
plotEllipseRotated([1],[1],[0,0],[0])
case 2
j=input('input PRN number =');
for jj=1:max(size(j))
w=Argument_of_Perigee(j(jj));
Ek=0:0.01:10*pi;
Mk=Ek-e(j(jj))*sin(Ek);
tk=(Mk-Mean_Anom(j(jj)))/(sqrt(GM/a(j(jj))^3) );
t=tk+t0(j(jj));
omegak=Right_Ascen_at_Week(j(jj))+(Rate_of_Right_Ascen(j(jj))-we).*tk-we.*t0(j(jj));
r_orb=[a(j(jj))*(cos(Ek)-e(j(jj)));a(j(jj))*sin(Ek)*sqrt(1-e(j(jj))^2);zeros(1,max(size(Ek)))];
r=Rotation(1,-i(j(jj)))*Rotation(3,-w)*r_orb;
r_ct=[];
for k=1:max(size(Ek));
r_ct(:,k)=S*Rotation(3,-omegak(k))*r(:,k);
end
for k=1:size(r_ct,2)
X=r_ct(1,k);
Y=r_ct(2,k);
Z=r_ct(3,k);
%kartezian be monhani
p=sqrt(X^2+Y^2);
phi0=atan((Z/p)/(1-E2));
N0=A/(1-E2*sin(phi0)^2)^.5;
h0=p/cos(phi0)-N0;
Landa=wrapTo2Pi(atan2(Y,X));
repitition=0;delta_phi=1;delta_h=1;
while abs(delta_phi)>10^-5 && abs(delta_h)>10^-5
N=A/(1-E2*sin(phi0)^2)^.5;
h=(p/cos(phi0))-N;
phi=atan((Z/p)*((1-((E2*N)/(N+h)))^-1));
delta_phi=phi-phi0;delta_h=h-h0;phi0=phi;h0=h;
repitition=repitition+1;
end
PHI(k)=phi;LANDA(k)=Landa;
end
%wgs84
Landa=[LANDA LL];
Phi=[PHI PP];
q=log(tan(pi/4 +Phi./2).*((1-sqrt(E2).*sin(Phi))./(1+sqrt(E2).*sin(Phi))).^(sqrt(E2)/2));
x=A*(Landa);
y=A*q;
hold on
plot(x,y,'.');
title('in Mercator')
end
end