Index exceeds the number of array elements (1).

clear all;
Rj=(1:1:30);
Pj= 1; %Power in Watts
Gj= 1; %Gain of antenna of jammer
c=3*10^8; %Speed of Light
f= 1575*10^9 ; 
Lamda=c/f; 
Graj= 0.5;  %Gain of GPS receiver
BBW= 50; %Baswband Signal Bandwidth in Hz
Lr= 1.58; %Atmospheric losses
SSBW= 10230000; %Spead Spectrum Bandwidth in Hz
DZ= -162; 
p=pi;
for a = length(Rj)
Pgj(a+1) =((Pj*Gj)/(4*p(Rj)^2))*((Lamda^2*Graj)/(4*p))*(1/Lr)*(BBW/(2*SSBW));
end

plot(Rj,10*log10(Pgj), Rj,DZ);
title({'GPS Jamming Power in dBW vs Range in km'});
ylabel('Power dBW');
xlabel('Range(km)');
legend('10*Log (Pgj)','Denial Zone = - 162dB');

Hello I keep getting this error. I'm not sure how to fix. Any guidance would be greatly appreciated.

[SHIVAM KUMAR]

Telling the line number where this error occurs will make it easier to debug.

[LaChelle McMahan]

Pgj(a+1) =((Pj*Gj)/(4*p(Rj)^2))*((Lamda^2*Graj)/(4*p))*(1/Lr)*(BBW/(2*SSBW));

This is the line that produces the error.

Answer 1

[SHIVAM KUMAR]

I run it with adding 1 more dot before division . this runs and plots the graph though I am not sure if everything is working fine. And make DZ a array to plot that correctly.

In case its correct accept the answer and close this thing.

clear all;
Rj=(1:1:30);
Pj= 1; %Power in Watts
Gj= 1; %Gain of antenna of jammer
c=3*10^8; %Speed of Light
f= 1575*10^9 ; 
Lamda=c/f; 
Graj= 0.5;  %Gain of GPS receiver
BBW= 50; %Baswband Signal Bandwidth in Hz
Lr= 1.58; %Atmospheric losses
SSBW= 10230000; %Spead Spectrum Bandwidth in Hz
DZ= -162.0*ones(1,30); 
p=pi;
 %remove the loop its not actually needed .
 %I hope you used (Rj)^2 to square each of its elements and not the matrix so use a dot operator to make matlab do that
Pgj =((Pj*Gj)./(4*p*(Rj).^2))*((Lamda^2*Graj)/(4*p))*(1/Lr)*(BBW/(2*SSBW));
plot(Rj,10*log10(Pgj), Rj,DZ);
title({'GPS Jamming Power in dBW vs Range in km'});
ylabel('Power dBW');
xlabel('Range(km)');
legend('10*Log (Pgj)','Denial Zone = - 162dB');

[LaChelle McMahan]

Thanks!

[SHIVAM KUMAR]

I hope this is correct

Answer 2

[SHIVAM KUMAR]

What I guessed it you didn't use the loop properly

clear all;
Rj=(1:1:30);
Pj= 1; %Power in Watts
Gj= 1; %Gain of antenna of jammer
c=3*10^8; %Speed of Light
f= 1575*10^9 ; 
Lamda=c/f; 
Graj= 0.5;  %Gain of GPS receiver
BBW= 50; %Baswband Signal Bandwidth in Hz
Lr= 1.58; %Atmospheric losses
SSBW= 10230000; %Spead Spectrum Bandwidth in Hz
DZ= -162; 
p=pi;
 %remove the loop its not actually needed .
 %I hope you used (Rj)^2 to square each of its elements and not the matrix so use a dot operator to make matlab do that
Pgj =((Pj*Gj)/(4*p*(Rj).^2))*((Lamda^2*Graj)/(4*p))*(1/Lr)*(BBW/(2*SSBW));

plot(Rj,10*log10(Pgj), Rj,DZ);
title({'GPS Jamming Power in dBW vs Range in km'});
ylabel('Power dBW');
xlabel('Range(km)');
legend('10*Log (Pgj)','Denial Zone = - 162dB');

[SHIVAM KUMAR]

Matlab does array computations even without loop.

[LaChelle McMahan]

Thanks for the feedback but that didnt fix the problem. I recieved the same error.

[SHIVAM KUMAR]

which line is the error coming in ?

[LaChelle McMahan]

Pgj =((Pj*Gj)/(4*p*(Rj).^2))*((Lamda^2*Graj)/(4*p))*(1/Lr)*(BBW/(2*SSBW));

This line is causing the error.