www.pudn.com > programradarsystemdisign.zip > fig2_9.m

% This program is used to produce Fig. 2.9 
close all 
clear all 
pfa = 1e-9; 
nfa = log(2) / pfa; 
b = sqrt(-2.0 * log(pfa)); 
index = 0; 
for snr = 0:.1:20 
   index = index +1; 
   a = sqrt(2.0 * 10^(.1*snr)); 
   pro(index) = marcumsq(a,b); 
   prob205(index) =  pd_swerling5 (pfa, 1, 10, snr); 
end 
x = 0:.1:20; 
plot(x, pro,'k',x,prob205,'k:'); 
axis([0 20 0 1]) 
xlabel ('SNR - dB') 
ylabel ('Probability of detection') 
legend('np = 1','np = 10') 
grid