• 大小: 7.46MB
    文件类型: .zip
    金币: 2
    下载: 1 次
    发布日期: 2023-09-22
  • 语言: Matlab
  • 标签: SAR成像  matlab  

资源简介

评估指标为点目标距离向和方位向峰值坐标、峰值旁瓣比、一维积分旁瓣比、二维积分旁瓣比、剖面图

资源截图

代码片段和文件信息

%%%%%%%%%%%%%%%%%评估指标为点目标距离向和方位向峰值坐标、峰值旁瓣比、一维积分旁瓣比、二维积分旁瓣比、剖面图%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%处理矩阵列为距离向%%%%%%%%%%%%%%%%%
%%%%%一维积分旁瓣比定义第一零点以外为旁瓣,二维积分旁瓣比主瓣近似矩形计算%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%
clc;
clear all;

Nr=512;
Na=2048;
fs=1e9;
v0=6887.683;
PRF=44887.73;
c=3e8;
%%%%%%%%%%%%%%%%读取数据%%%%%%%%%%%%%%%%%%%%
%回波数据
echo=[];
shu=[];
M=[];
guodu=zeros(1Nr);
fid=fopen(‘评估结果.SAR_Result.dat‘‘rb‘);
for i=1:Na
   M=fread(fidNr*2‘float‘);
   for m=1:Nr
       guodu(1m)=M(2*m-1)+M(2*m)*1j;
   end
   echo(i:)=guodu;
end
fclose(fid);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%二维插值处理,D2为二维插值倍数%%%%%%%%%%%%%%%%%%
echo=echo‘;%%每列有512个点,列为距离向
Max=max(max(abs(echo)));  %最大值
[XY]=find(abs(echo)==Max);%峰值坐标
 DArea=echo(X-128:X+128Y-128:Y+128); %%取257*257区域
 E1=fftshift(fft(DArea)1);%先距离向
 E2=fftshift(fft(E1.‘)1);
 D2=8;%二维D2倍插值
 A3=[zeros(257floor(257*(D2-1)/2)) E2 zeros(257(D2-1)*257-floor(257*(D2-1)/2))];
 A4=[zeros(D2*257floor(257*(D2-1)/2)) A3.‘ zeros(D2*257(D2-1)*257-floor(257*(D2-1)/2))];
 A4=A4.‘;
 A5=ifft(fftshift(A41));
 A6=ifft(fftshift(A5.‘1));%%%转回时域;
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%一维维插值处理,D1为插值倍数%%%%%%%%%%%%%%%%%%
 Max_one=max(max(abs(A6)));  %最大值
[ij]=find(abs(A6)==Max_one);%最大值所在行列
A=A6(i-128:i+128j);%抽取列距离向
B=A6(ij-128:j+128);%抽取行,方位向
A1=fftshift(fft(A.‘));
B1=fftshift(fft(B));
D1=128;%插值倍数
R1=[zeros(1floor(length(A1)*(D1-1)/2)) A1 zeros(1floor(length(A1)*(D1-1)/2))];
B2=[zeros(1floor(length(B1)*(D1-1)/2)) B1 zeros(1floor(length(B1)*(D1-1)/2))];
R2=abs(ifft(fftshift(R1)));%%距离向插值后到时域
A2=abs(ifft(fftshift(B2)));%%方位向插值后到时域
r2=20*log10(R2/max(R2));%%距离向归一化
a2=20*log10(A2/max(A2));%%方位向归一化
%%%%%%%%%%%距离向分辨率%%%%%%%%%%%%%%%%%%%%%%
[max_rPOS_r]=max(r2);
r3=POS_r;
%%%%%%%%%%%%%%左边3DB点%%%%%%%%%%%%
while(r2(r3)>-3)  
 r3=r3-1;
end;
rWidth_3db1=r3;
%%%%%%%%%%%%%找左边第一零点%%%%%%%%%%%%%%
for r4=rWidth_3db1:-1:1
    if R2(r4)   break
    end
end
zero_left=r4;
%%%%%%%%%%%%%找左边第一旁瓣值%%%%%%%%%%%%%%

for r5=zero_left-1:-1:1
    if R2(r5)>R2(r5-1)
   break
    end
end

%%%%%%%%%%%%%左边旁瓣能量%%%%%%%%%%%%%%
r_Sum_sidelobe1=0; 
for rs1=1:zero_left-1   
r_Sum_sidelobe1 = r_Sum_sidelobe1 +R2(rs1) * R2(rs1);%%%左边旁瓣求和
end
%%%%%%%%%%%%%%右边3DB点%%%%%%%%%%%%

r3=POS_r+1;
while(r2(r3)>-3)
 r3=r3+1;
end;
rWidth_3db2=r3;

%%%%%%%%%%%%%找右边第一零点%%%%%%%%%%%%%%
for r6=rWidth_3db2:length(r2)
    if R2(r6)   break
    end
end
zero_right=r6;


%%%%%%%%%%%%%找右边第一旁瓣值%%%%%%%%%%%%%%

for r7=zero_right+1:length(r2)
    if R2(r7)>R2(r7+1)
   break
    end
end
%%%%%%%%%%%%%主瓣能量%%%%%%%%%%%%%%
r_Sum_mainlobe=0;
for r8=zero_left:zero_right   
  r_Sum_mainlobe= r_Sum_mainlobe+R2(r8)*R2(r8);
end
%%%%%%%%%%%%%右边旁瓣能量%%%%%%%%%%%%%%
r_Sum_sidelobe =r_Sum_sidelobe1 ;
for rs2=zero_right+1:length(r2)
r_Sum_sidelobe=r_Sum_sidelobe +R2(rs2)*R2(rs2);
end
%%%%%%%%%%%%找第一旁瓣较大值%%%%%%%%%%%%%%
rMax_sidelobe=max(R2(r5)R2(r7));
rMax_mainlobe=max(R2);
%%%%%%%%%%%%

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     文件        5795  2013-04-19 20:32  峰值旁瓣比和积分旁瓣比\erweijifenpangbanbi.asv
     文件        5997  2013-04-19 21:05  峰值旁瓣比和积分旁瓣比\pointevaluate.m
     文件        5291  2013-04-19 23:15  峰值旁瓣比和积分旁瓣比\pointevaluate_xy.m
     文件     8388608  2013-01-07 10:37  峰值旁瓣比和积分旁瓣比\评估结果.SAR_Result.dat
     目录           0  2019-01-09 16:31  峰值旁瓣比和积分旁瓣比\

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