%DDS?Parameters
%??M?-?Accumulator?Width
%??N?-?Phase?Width
%??fref?-?Reference?Frequency
M=24;
N=20;
fref=16.8e6;

%Output?Parameters
%??K?-?Index?Width
%??J?-?Output?Width
K=4;
J=3;

%System?Parameters
%??ftarget?-?Target?Frequency
%??dphi?-?Phase?Value?For?Target
ftarget=1.023e6;
dphi=1021613;

%Generate?Output?Lookup?Table
lut=floor（（2^J-1）*sin（2*pi*（0:2^J-1）/2^J））;

%Generate?Target
tmax=50/ftarget;
t=[0:1/fref:tmax];
target=（2^J-1）*sin（2*pi*ftarget*t）;

%Perform?DDS
acc=0;
out=zeros（length（t）1）;
for?i=1:length（t）
????index=bitshift（acc-（M-（K-1）））;
????out（i）=lut（index+1）;
????
????acc=mod（acc+dphi2^M）;
end

subplot（211）;
plot（toutttarget‘--‘）;
subplot（212）;
ssf=linspace（0fref/2length（out）/2）;
out_fft=fft（out）;
target_fft=fft（target）;
plot（ssfabs（out_fft（1:length（out）/2）

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????848??2013-01-23?23:05??matlab\dds\dds.m

?????文件????????658??2013-01-23?23:05??matlab\dds\dds_designer.m

?????文件???????3488??2013-01-23?23:05??matlab\lookup_table\lookup_table.m

?????文件???????1351??2013-01-23?23:05??matlab\navigation\constant.m

?????文件???????1159??2013-01-23?23:05??matlab\navigation\ecef.m

?????文件???????2409??2013-01-23?23:05??matlab\navigation\elevazim.m

?????文件???????4953??2013-01-23?23:05??matlab\navigation\findsat.m

?????文件???????3794??2013-01-23?23:05??matlab\navigation\formatdata.m

?????文件??????13833??2013-01-23?23:05??matlab\navigation\gps.m

?????文件??????13438??2013-01-23?23:05??matlab\navigation\kalman_nav.m

?????文件???????2122??2013-01-23?23:05??matlab\navigation\latlong.m

?????文件???????3781??2013-01-23?23:05??matlab\navigation\pseudocalc.m

?????文件???????3206??2013-01-23?23:05??matlab\navigation\rangecal.m

?????文件????????410??2013-01-23?23:05??matlab\navigation\RotX.m

?????文件????????408??2013-01-23?23:05??matlab\navigation\RotY.m

?????文件????????419??2013-01-23?23:05??matlab\navigation\RotZ.m

?????文件???????1044??2013-01-23?23:05??matlab\navigation\SatToEcef.m

?????文件???????3510??2013-01-23?23:05??matlab\navigation\solvepos.m

?????文件???????7061??2013-01-23?23:05??matlab\receiver\aided_acquisition.m

?????文件???????1963??2013-01-23?23:05??matlab\receiver\bit_lock.m

?????文件???????2366??2013-01-23?23:05??matlab\receiver\cacodegn.m

?????文件???????2262??2013-01-23?23:05??matlab\receiver\calcdop.m

?????文件???????1739??2013-01-23?23:05??matlab\receiver\carrier_lock_indicator.m

?????文件???????3669??2013-01-23?23:05??matlab\receiver\ca_correlator.m

?????文件????????196??2013-01-23?23:05??matlab\receiver\clear_track.m

?????文件???????1351??2013-01-23?23:05??matlab\receiver\constant.m

?????文件????????543??2013-01-23?23:05??matlab\receiver\constant_h.m

?????文件???????3578??2013-01-23?23:05??matlab\receiver\constant_rcx.m

?????文件???????1516??2013-01-23?23:05??matlab\receiver\convertbitpack2bit1.c

?????文件???????1596??2013-01-23?23:05??matlab\receiver\cxcorr.m

............此處省略156個文件信息