資源簡介
鎖相環路,注釋很清楚
代碼片段和文件信息
%%%%%%%%%%%%%%costas_PLL
close?all
clear?all
format??long
%%%%%%%%%%%%%%%%%%%%%%?
aa?=?input(‘input?original?phase?of?signal(degree):‘)
bb?=?input(‘input?doppler?of?signal(Hz):‘)
dt?=?0.001
t?=?0:dt:20
num?=?length(t)
flo?=?40;
df?=?bb;
A?=?1;
fin?=?flo?+?df;
PHin?=?aa?*?pi/180;?%pi/12;
PHase_in?=?2?*?pi?*?fin?*?t?+?PHin;
input_sig?=?A?*?sin(PHase_in);
%%%%%%%%%%%%%%
sum_time?=?50;%積分時間
PHout?=?zeros(11);
PHase_out?=?2?*?pi?*?flo?*?t(1:sum_time)??+?PHout;
lo_sin?=?zeros(1sum_time);
lo_cos?=?zeros(1sum_time);
lo_sin(1:sum_time)?=?sin(PHase_out);
lo_cos(1:sum_time)?=?cos(PHase_out);
%%%%%%%%%%%%%%%%%%%
w12?=?0;
w22?=?0;
w32?=?0;?
w52?=?0;
G?=?106;%%%%%%%加快收斂速度
par2?=?10;
par1?=?1;
K?=?1/2;
%%%%%%%%%%%%%%%%%%%
for?n?=?1:1:round(num/sum_time)-1
????w12?=?0;%積分前清零
????w22?=?0;%積分前清零
????for?m?=?1:1:sum_time
????????nn?=?(n?-?1)?*?sum_time?+?m;
????%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%下變頻混頻
????????mix_sin(nn)?=?input_sig(nn)?*?lo_sin(nn);
????????mix_cos(nn)?=?input_sig(nn)?*?lo_cos(nn);
????%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%低通濾波器
????????w11?=?w12?+?mix_sin(nn)?*?dt/2;
????????w13?=?w11?+?w12;
????????w12?=?w11;
????????w21?=?w22?+?mix_cos(nn)?*?dt/2;
????????w23?=?w21?+?w22;
????????w22?=?w21;
????end
????%%%%%%%%%%%%%%%%%%%%%PD鑒相器
????%x?=?w13?*?w23;
?%???x?=?atan(w23/w13);%2相鑒相
????%x?=?w23/w13;%
??????x?=?atan2(w23w13);%4相鑒相
????%%%%%%%%%%%%%%%%%%%%
????xouttemp(n)?=?x;
????pll_locked_sin(n)?=?sin(x);
????pll_locked_cos(n)?=?cos(x);
????%%%%%%%%%%%%%%%%%%%有源比例積分環路濾波器LF
????w41?=?G?*?sin(x);
????w42?=?w41?*?par2/par1;
????w43?=?w41?*?1/par1;
????w31?=?w32?+?w43?*?dt/2;
????w33?=?w32?+?w31;
????w32?=?w31;
????y?=?w42?+?w33;
????%%%%%%%%%%%%%%%%%%%%VCO相位輸出
????w51?=?w52?+?y?*?dt/2;
????w53?=?w51?+?w52;
????w52?=?w51;
????PHout?=?K?*?w52;
????PHouttemp(n)?=?PHout;
????%%%%%%%%%%%%%%%%%%%%LUT輸出正弦、余弦
????for?m?=?1:1:sum_time
????????nm?=?n?*?sum_time?+?m
????????PHase_out(nm)?=?2?*?pi?*?flo?*?(nm)?*?dt?+?PHout;
????????PHase_outtemp(nm)?=?PHase_out(nm);?
????????lo_sin(nm)?=?sin(PHase_out(nm));
????????lo_cos(nm)?=?cos(PHase_out(nm));
????%%%%%%%%%%%%%%%%%%%%
????????lo_sin_out(nm)?=?lo_sin(nm);
????????lo_cos_out(nm)?=?lo_cos(nm);
????end
end
figure(1)
subplot(211)
plot((1:num)PHin?*?180/pi)
title(‘original?phase?of?input?signal‘)
xlabel(‘sample?times‘)
ylabel(‘degree‘)
grid?on
subplot(212)
plot((1:num)PHase_in.*?180/pi);
title(‘phase?of?input?signal‘);
xlabel(‘sample?times‘)
ylabel(‘degree‘)
grid?on
figure(2)
subplot(211)
plot((1:length(PHouttemp))PHouttemp.*?180/pi?+?15)
title(‘costas?loop?vco?phase?output‘)
xlabel(‘sample?times‘)
ylabel(‘degree‘)
grid?on
subplot(212)
plot((1:length(PHase_outtemp))PHase_outtemp.*?180/pi)
title(‘costas?loop?track?phase‘)
xlabel(‘sample?times‘);
ylabel(‘degree‘);
grid?on
figure(3)
subplot(311)
plot((1:length(xouttemp))xouttemp.*?180/pi)
title(‘costas?loop?track?error‘)
xlabel(‘sample
?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????3677??2012-05-05?13:23??costas_PLL.m
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