%?compute_azim_spectra.m
%?----------------------
%
%?Divides?the?range?swath?（range?cells）?of?this?block?into?Nspect?sections?
%?and?finds?the?average?power?spectrum?for?each?segment.
%
%?Fits?a?parabola?to?the?baseband?Doppler?centroid?vs.?range
%?This?fit?is?most?useful?if?the?whole?range?swath?is?selected?but?the
%?computing?times?get?large?if?more?than?1024?range?lines?（azimuth?cells）
%?are?selected?in?one?run.
%
%?Run?“specify_run_parameters.m“?and?“extract_data.m“?first?to?extract
%?the?data?from?the?CD.?The?data?can?be?stored?in?MAT?or?binary?files.
%?-------------------------------------------------------------------------

%??Load?the?parameters?for?this?run
clear????format?compact
set（?0?‘DefaultTextFontSize‘???12?）??%?Plotting?defaults
set（?0?‘DefaultLineLineWidth‘?1.5?）
set（?0?‘DefaultAxesFontSize‘????8?）
tfs?=?13;????lfs?=?11;
load?CD_run_params

disp?‘?‘
disp?‘---------------------------------------------------------‘
fprintf（‘?UBC?RRSG?-?Plot?the?azimuth?spectrum?of?each?data?block‘）
disp?‘?‘
disp?‘---------------------------------------------------------‘

Nrowsg?=?3;?????%?Number?of?subplots?in?row?direction?of?the?figure?
Ncolsg?=?3;?????%?Number?of?subplots?in?column?direction?of?the?figure?
Nspect?=?Nrowsg*Ncolsg;?????????%?Total?number?of?spectra?to?calculate
Nrglpb?=?floor（?Nrg_cells/Nspect?）;??%??No.?of?range?cells?per?spectra
wd?=?0.81/Ncolsg;???dx?=?wd?+?0.045;???x0?=?0.07;????
ht?=?0.39/Nrowsg;???dy?=?0.28;?????????y0?=?1-dy;??

for?b?=?1?:?Nblocks
????
????file_pre?=?strcat（?output_path?output_prefix?‘_‘?num2str（b）?）;
????
????disp?‘?‘
????disp?（[‘Load?or?Extract?AGC?setting?and?Data?for?block?‘?num2str（b）?]）
????%??Load?a?block?of?‘AGC_values‘
????AGC_values?=?load_AGC_block（?file_pre?first_rg_line?...
??????????????????????????????????????????Nrg_lines_blk?b??UseMATfiles?）;
??????????????????????????????????????
????%??Load?a?block?of?raw?SAR?data
????data?=?load_DATA_block（?file_pre?output_path?Nrg_lines_blk?...
?????????????????????????????Nrg_cells?AGC_values?b?UseMATfiles?）;
????????
????disp?‘Compute?and?plot?azimuth?power?spectra‘
????tic
????figure（202）?clf
????freq?=?[0:Nrg_lines_blk-1]*PRF/Nrg_lines_blk;
????b1?=?first_rg_line?+?（b-1）?*?Nrg_lines_blk;
????b2?=?first_rg_line?+?b?*?Nrg_lines_blk?-?1;
????
????%??Find?azimuth?power?spectra?and?average
????for?krg?=?1?:?Nspect
????????r1?=?1?+?（krg-1）*Nrglpb;???r2?=?r1?+?Nrglpb?-?1;
????????DATA?=?fft（?data（:r1:r2）?）;
????????DATA_aver（krg:）?=?mean（?abs（DATA.‘）.^2?）/1000000;
????????ysc（krg）?=?1.05*max（DATA_aver（krg:））;
????end??%?of?for?krg?=?1?:?Nspect
????ysc0?=?max（?ysc?）;??????%??Common?vertical?scaling?for?all?the?spectra
????
????%??Plot?the?azimuth?spectrum
????
????for?krg?=?1?:?Nspect
????????subplot（Nrowsg?Ncolsg?krg）
????????plot（?freq?DATA_aver（krg:）?）???grid???hold?on
????????set（?gca?‘Pos‘...
???????????[x0+dx*mod（（krg-1）Ncolsg）??y0-dy*floor（（

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2015-11-11?02:18??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\
?????目錄???????????0??2015-11-11?02:18??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\digital?processing?of?SAR?data\
?????目錄???????????0??2015-11-11?02:18??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\digital?processing?of?SAR?data\CD_Programs\
?????文件???????19632??2005-01-21?11:24??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\digital?processing?of?SAR?data\CD_Programs\AGC_attenuation_values.mat
?????文件????????5541??2005-01-26?10:31??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\digital?processing?of?SAR?data\CD_Programs\compute_azim_spectra.m
?????文件????????4247??2004-12-30?19:00??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\digital?processing?of?SAR?data\CD_Programs\extract_AGC.m
?????文件????????5245??2005-01-19?11:51??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\digital?processing?of?SAR?data\CD_Programs\extract_data.m
?????文件????????2392??2005-01-21?11:57??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\digital?processing?of?SAR?data\CD_Programs\load_AGC_block.m
?????文件????????3116??2004-12-30?18:12??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\digital?processing?of?SAR?data\CD_Programs\load_DATA_block.m
?????文件????????7064??2005-01-21?12:56??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\digital?processing?of?SAR?data\CD_Programs\read_CEOS_raw.m
?????文件????????5572??2012-10-28?16:53??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\digital?processing?of?SAR?data\CD_Programs\specify_parameters.asv
?????文件????????5501??2012-10-28?17:05??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\digital?processing?of?SAR?data\CD_Programs\specify_parameters.m
?????文件???????19968??2012-10-28?16:05??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\digital?processing?of?SAR?data\Cumming_Wong_Errata.doc
?????文件??????879758??2012-10-28?16:06??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\digital?processing?of?SAR?data\Extracting_SAR_Data_from_the_CD.pdf
?????文件????39197738??2013-12-27?23:16??合成孔徑雷達成像算法與實現（附光盤數據和仿真代碼）\合成孔徑雷達成像算法與實現.pdf