function?[fd_af_ac_code]?=?acqu（Signal_Source）
global?svnum;
global?fs;
global?nn;
global?F_if
%?======================================Create?Localcode==============?%
ph_code?=?0;
fd_code?=?0;
Loop_time?=?1;
CA_Code?=?CAcode（ph_codefd_codeLoop_time）;
Localcode?=?CA_Code;


%?==================================function?RxSignal============%
x1?=?Signal_Source（1:length（Localcode））;

t?=?[0:length（Localcode）-1];
for?i=1:41
????fr=F_if-10000+（i-1）*500;
????lc?=?x1.*exp（j*2*pi*fr*t/fs）;
????xf?=?fft（lc）;
????lcf?=?fft（Localcode）;
????yy（i:）=ifft（lcf.*conj（xf））;
?end
?
L1=length（yy（1:））;
LL=L1;
yy1=zeros（41LL）;
yy1=yy（[1:41][1:LL]）;
Corr_value?=?（abs（yy1））.^2;?
%??figure
%??mesh（Corr_value）;

[valuecode_p]?=?max（max（?Corr_value））;
[valuecarrier_p]?=?max（max（?Corr_value‘））;

fd_a?=?-10000+（carrier_p-1）*500;????????????%捕獲到的多普勒頻率
ac_carrier?=?F_if-10000+（carrier_p-1）*500;

ac_code=code_p-3;
xsh?=?nn/1023;
f_ac_code?=?ac_code/xsh;????%捕獲到的碼相位
%%%%%%%%%%%%%%%%%%%%%%%%畫圖顯示%%%%%%%%%%%%%%%%%%%%%%%
X=1023*[1:5000]/5000;????%轉換回碼片值以后的坐標;
Y=[0:40];

figure;
mesh（XYCorr_value）;
axis（[0?inf?0?inf??0?inf?]）;
set（gca‘ytick‘[0:10:40]）;
set（gca‘yticklabel‘{‘-10‘‘-5‘‘0‘‘5‘‘10‘}）;
set（gca‘xtick‘[1:100:1001]）;
set（gca‘xticklabel‘{‘1‘‘100‘‘200‘‘300‘‘400‘‘500‘‘600‘‘700‘‘800‘‘900‘‘1000‘}）;
xlabel（‘本地碼相位（chip）‘）;
ylabel（‘多普勒頻率成份（kHz）‘）;
zlabel（‘相關值‘）;
title（‘捕獲結果‘）
title（[num2str（svnum）?‘號衛星‘?‘捕獲結果‘]）;
hidden;
shading?interp;

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

?????文件???????1571??2011-02-20?22:23??Trackdemo\acqu.m

?????文件???????1721??2005-12-13?00:29??Trackdemo\acqu1.m

?????文件????????973??2005-12-13?00:40??Trackdemo\acquiresignal.m

?????文件????3153342??2011-03-20?20:16??Trackdemo\Acquiresion.fig

?????文件????????314??2005-06-30?19:25??Trackdemo\AWGN.m

?????文件????????601??2005-10-27?21:05??Trackdemo\CAcode.m

?????文件????????236??2011-02-19?17:13??Trackdemo\CarrierLoopFilter.m

?????文件????????882??2005-05-31?19:28??Trackdemo\codegen.m

?????文件????????305??2011-02-19?17:12??Trackdemo\CodeLoopFilter.m

?????文件???????1015??2005-12-15?11:00??Trackdemo\CreateSource.m

?????文件???????1305??2005-11-30?17:17??Trackdemo\CreateSource1.m

?????文件??????11965??2011-02-13?21:55??Trackdemo\demotrace.m

?????文件???????9452??2011-02-15?12:07??Trackdemo\demotrack.m

?????文件???????1500??2005-12-14?17:04??Trackdemo\framecheck2.m

?????文件????????378??2005-10-27?17:42??Trackdemo\Modulate.m

?????文件???????1190??2005-12-12?22:46??Trackdemo\sourcegenerate.m

?????文件??????12517??2011-02-20?22:23??Trackdemo\tracksignal.asv

?????文件??????12532??2011-02-20?22:23??Trackdemo\tracksignal.m

?????目錄??????????0??2012-09-27?12:43??Trackdemo

-----------?---------??----------?-----??----

??????????????3211799????????????????????19