Phased Arrays - MATLAB Simulations for Radar Systems Design - page 377

polardb(theta,pattern)
title ('Power pattern [dB]')
Listing 8.2. MATLAB Program Ðfig8_7.mÑ
% Use this program to reproduce Fig. 8.7 of text
clear all
close all
eps =0.00001;
N = 32;
rect(1:32) = 1;
ham = hamming(32);
han = hanning(32);
blk = blackman(32);
k3 = kaiser(32,3);
k6 = kaiser(32,6);
RECT = 20*log10(abs(fftshift(fft(rect, 512)))./32 +eps);
HAM = 20*log10(abs(fftshift(fft(ham, 512)))./32 +eps);
HAN = 20*log10(abs(fftshift(fft(han, 512)))./32+eps);
BLK = 20*log10(abs(fftshift(fft(blk, 512)))./32+eps);
K6 = 20*log10(abs(fftshift(fft(k6, 512)))./32+eps);
x = linspace(-1,1,512);
figure
subplot(2,1,1)
plot(x,RECT,'k--',x,HAM,'k',x,HAN,'k-.');
xlabel('x')
ylabel('Window')
grid
axis tight
legend('Rectangular','Hamming','Hanning')
subplot(2,1,2)
plot(x,RECT,'k--',x,BLK,'k',x,K6,'K-.')
xlabel('x')
ylabel('Window')
legend('Rectangular','Blackman','Kasier at \beta = 6')
grid
axis tight
Listing 8.3. MATLAB Function Ðlinear_array.mÑ
function [theta,patternr,patterng] =
linear_array(Nr,dolr,theta0,winid,win,nbits);
% This function computes and returns the gain radiation pattern for a linear
array