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clear;?clc;?close?all;
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%%?Parameter--constant??
C?=?3e8;???????????????%speed?of?light
Fc?=?1e9;??????????????%carrier?frequency
lambda?=?C/Fc;??????????%wavelength
Rfactor?=?2;?????????%?距離維采樣倍數因子
Afactor?=?1;?????????%
%%Parameter--resolution??距離維和方位向的分辨率要求是多少
DY?=?5;???????????????????%range?resolution??DY?=?C/2/Br
DX?=?1;???????????????????%cross-range?resolution??DX?=?D/2??分辨率都是兩名
%%Parameter--target?area?觀察場景相關參數
Xmin?=?0;??????????????%Targets?area?in?azimuth?is?within?[Xmin?Xmax]
Xmax?=?200;
Yc?=?10000;?????????????%Center?of?imaged?area?場景中心線?
Yw?=?300;??????????????%Target?area?in?range?is?within[Yc-YwYc+Yw]
???????????????????????%imaged?width?is?2*Yw
%%Parameter--orbital?information?載機平臺相關參數
V?=?100;???????????????%SAR?velocity?100m/s?載機速度
H?=?6000;??????????????%height?of?airborne?6000m??載機運行高度
R0?=?sqrt（H^2+Yc^2）;???%載機的中心垂直距離?是常數???Yc是場景中心線距離
theta=90*pi/180;	???%?squint?angle??斜視角
%%Parameter--antenna???天線參數
D?=?2*DX;??????????????%antenna?length?in?azimuth?direction??由方向向分辨率決定
Lsar?=?lambda*R0/D;????%SAR?integration?length??合成孔徑長度
Tsar?=?Lsar/V;?????????%SAR?integration?time????合成孔徑時間

%%Parameter--fast-time?domain??快時間域參數設置
Tr?=?10e-6;?????????????????%pulse?duration?10us??發射脈沖寬度?
Br?=?C/（2*DY）;??????????????%chirp?frequency?modulation?bandwidth?30MHz?LFM信號的帶寬?由距離維分辨率決定
Kr?=?-Br/Tr;?????????????????%chirp?slope?????????LFM信號的調頻率?這里為了看回波采用負調頻
Fsr?=?Rfactor*Br;???????????%sample?frequency?in?fast-time?domain??距離維采樣頻率?由奈奎斯特原理知要大于等于帶寬
dt?=?1/Fsr;?????????????????%sample?spacing?in?fast-time?domain??距離維的采樣間隔


Rmin?=?sqrt（（Yc-Yw）^2+H^2）;???????????????%最小斜距在距離維???
%?Rmax?=?sqrt（（Yc+Yw）^2+H^2+（Lsar/2）^2）;??%最大斜距在距離維
Rmax?=?sqrt（（Yc+Yw）^2+H^2）;???????????????%最大斜距在距離維
Rwid?=?Rmax-Rmin;?????????????????????????%也就是波門的范圍
Twid?=?2*Rwid/C;
Nfast?=?ceil（Twid/dt+Tr/dt）;??????????????%sample?number?in?fast-time?domain?雷達成像技術書P23頁說明
Nfast?=?2^nextpow2（Nfast）;????????????????%Ready?for?fft
tm=linspace（2*Rmin/C2*Rmax/C+TrNfast）;??%discrete?time?array?in?fast-time?domain????離散化
dt=（2*Rmax/C+Tr-2*Rmin/C）/Nfast;??????????%修正和更新采樣間隔
Fsr=1/dt;

%%Parameter--slow-time?domain?慢時間域參數設置
Ka?=?-2*V^2/lambda/R0;??????????%doppler?frequency?modulation?rate?多普勒頻率調制率
Ba?=?abs（Tsar*Ka）;?????????????%doppler?frequency?modulation?bandwidth?多普勒頻率調制帶寬
PRF?=?Afactor*Ba;??????????????%pulse?repetition?frequency?以Afactor倍的帶寬去采樣??也就是采樣頻率
PRT?=?1/PRF;???????????????????%pulse?repetition?interval?也就是采樣間隔?
ds?=??PRT;?????????????????????%sample?spacing?in?slow-time?domain??采樣間隔
???????????????????????????????%因為我們知道慢時間域采樣頻率為PRF??
???

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2011-01-04?18:38??校正RCM完整程序和資料\
?????文件????????8402??2011-01-03?22:11??校正RCM完整程序和資料\range_migration.m
?????文件??????860955??2010-12-05?15:35??校正RCM完整程序和資料\SAR成像處理中插值算法的比較研究.pdf
?????文件??????330556??2010-12-05?15:36??校正RCM完整程序和資料\SAR距離_多普勒成像算法中的距離徙動及校正.pdf
?????文件???????94852??2010-12-05?15:35??校正RCM完整程序和資料\幾種SAR距離彎曲校正算法比較分析.pdf
?????文件??????375465??2010-12-05?15:35??校正RCM完整程序和資料\距離_多普勒方法中的幾種插值算法比較.pdf