Radar Waveforms - MATLAB Simulations for Radar Systems Design - page 182

184 MATLAB Simulations for Radar Systems Design
end
Inphase = zeros((2*num_pulses),1);
Quadrature = zeros((2*num_pulses),1);
Inphase_tgt = zeros(num_pulses,1);
Quadrature_tgt = zeros(num_pulses,1);
IQ_freq_domain = zeros((2*num_pulses),1);
Weighted_I_freq_domain = zeros((num_pulses),1);
Weighted_Q_freq_domain = zeros((num_pulses),1);
Weighted_IQ_time_domain = zeros((2*num_pulses),1);
Weighted_IQ_freq_domain = zeros((2*num_pulses),1);
abs_Weighted_IQ_time_domain = zeros((2*num_pulses),1);
dB_abs_Weighted_IQ_time_domain = zeros((2*num_pulses),1);
taur = 2. * rnote / c;
for jscat = 1:nscat
ii = 0;
for i = 1:num_pulses
ii = ii+1;
rec_freq = ((i-1)*freq_step);
Inphase_tgt(ii) = Inphase_tgt(ii) + sqrt(scat_rcs(jscat)) * cos(-
2*pi*rec_freq*...
(2.*scat_range(jscat)/c - 2*(V/c)*((i-1)*PRI + taur/2 +
2*scat_range(jscat)/c)));
Quadrature_tgt(ii) = Quadrature_tgt(ii) + sqrt(scat_rcs(jscat))*sin(-
2*pi*rec_freq*...
(2*scat_range(jscat)/c - 2*(V/c)*((i-1)*PRI + taur/2 +
2*scat_range(jscat)/c)));
end
end
if(winid >= 0)
window(1:num_pulses) = hamming(num_pulses);
else
window(1:num_pulses) = 1;
end
Inphase = Inphase_tgt;
Quadrature = Quadrature_tgt;
Weighted_I_freq_domain(1:num_pulses) = Inphase(1:num_pulses).* window';
Weighted_Q_freq_domain(1:num_pulses) = Quadrature(1:num_pulses).* win-
dow';
Weighted_IQ_freq_domain(1:num_pulses)= Weighted_I_freq_domain + ...
Weighted_Q_freq_domain*j;
Weighted_IQ_freq_domain(num_pulses:2*num_pulses)=0.+0.i;
Weighted_IQ_time_domain = (ifft(Weighted_IQ_freq_domain));
abs_Weighted_IQ_time_domain = (abs(Weighted_IQ_time_domain));