資源簡介
逆合成孔徑是指雷達天線不動,被觀測目標移動,對移動中的目標回波進行相干處理獲得大的合成孔徑,從而得到高方位尺寸分辨率。逆合成孔徑的基礎是轉臺成象。
代碼片段和文件信息
%tic;
clear;
load?‘F:\實驗室課題\雷達成像\雷達成像\ISAR\data‘;
s1=fft(s);%fft對矩陣按列進行傅里葉變換
for?i=1:256;
???s1(:i)=fftshift(s1(:i));%把直流分量移到圖像中
end
figure(1);
subplot(211);
contour(abs(s1));
title(‘雅克42對準前的數據‘);
%2.?ISAR運動補償距離對準空域法
s2=abs(s1);?????????????????%從前向后
s2=fft(s2);
tmp=abs(s1(1:256129));
TMP=fft(abs(tmp));
s3=s1;
for?i=1:256
???for?k=1:256
??????out(ki)=TMP(k)*conj(s2(ki));
???end
??????out1=ifft(out(:i));
??????out1=abs(out1);
??????[mj]=max(out1);
??????%for?i=1:256
?????????if(j>128)
????????????j=j-256;
?????????end??
?????????for?k=1:256
????????????J=k-j;?
????????if((J>0)&(J<=256))?%右移或左移
???????????s3(ki)=s1(Ji);
??? ????else?
?????? ???????s3(ki)=0;
????????end???
?????end
?????????%end
??
???if(i~=129)
?????????tmp=tmp+abs(s3(:i));
?????????if?i<129
?????????????t=i;
?????????else
?????????????t=i-1;?
?????????end?????????
?????????tmpt=tmp/(t+1);
?????????TMP=fft(tmpt);
???end
end
figure(5)
subplot(
?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2013-05-13?21:05??ISAR\
?????文件?????1048768??2013-02-25?20:14??ISAR\data.mat
?????文件??????????51??2013-02-25?20:14??ISAR\data說明.txt
?????文件????????2802??2013-02-25?20:14??ISAR\isar.m
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