www.pudn.com > targer_point.zip > bandwidth_a.m, change:2013-10-09,size:1444b


 
%%文件描述了不同方位向带宽时,AASR随着过采样率的变化而改变的曲线 
clc;clear all; 
%%恒值参数 
cj=sqrt(-1); 
C=3e8;  %光速 
%%典型星载雷达参数 
La=10; 
V=7100; 
B1=1200; 
B2=1400; 
B3=1600; 
 
%%带宽B1为1300时候曲线 
M=@(f)sinc((La*B1)/(4*V).*(f)).^4; 
q3=quadl(M,-1,1); 
q1=zeros(1,31); 
q2=zeros(1,31); 
 for n=110:1:140 
  m=n/100; 
  A1=@(f)(sinc((La*B1)/(4*V).*(f+2.*m))).^4; 
  q1(n-109)=quad(A1,-1,1); 
  A2=@(f)(sinc((La*B1)/(4*V).*(f-2.*m))).^4; 
  q2(n-109)=quad(A2,-1,1); 
  AASR1=20.*log10((q1+q2)./q3); 
 end 
  
  
%%带宽B2为1500时候曲线 
M=@(f)sinc((La*B2)/(4*V).*(f)).^4; 
q3=quadl(M,-1,1); 
q1=zeros(1,31); 
q2=zeros(1,31); 
 for n=110:1:140 
  m=n/100; 
  A1=@(f)(sinc((La*B2)/(4*V).*(f+2.*m))).^4; 
  q1(n-109)=quad(A1,-1,1); 
  A2=@(f)(sinc((La*B2)/(4*V).*(f-2.*m))).^4; 
  q2(n-109)=quad(A2,-1,1); 
  AASR2=20.*log10((q1+q2)./q3); 
 end 
  
 %%带宽B3为1700时候曲线 
M=@(f)sinc((La*B3)/(4*V).*(f)).^4; 
q3=quadl(M,-1,1); 
q1=zeros(1,31); 
q2=zeros(1,31); 
 for n=110:1:140 
  m=n/100; 
  A1=@(f)(sinc((La*B3)/(4*V).*(f+2.*m))).^4; 
  q1(n-109)=quad(A1,-1,1); 
  A2=@(f)(sinc((La*B3)/(4*V).*(f-2.*m))).^4; 
  q2(n-109)=quad(A2,-1,1); 
  AASR3=20.*log10((q1+q2)./q3); 
 end 
  
  
 t=1.1:0.01:1.4; 
figure 
plot(t,AASR1,t,AASR2,t,AASR3) 
grid on; 
legend('\fontsize{9}带宽Ba=1300','带宽Ba=1500','带宽Ba=1700'); 
xlabel('\fontsize{9}过采样率'); 
ylabel('\fontsize{9}AASR(db)'); 
title('\fontsize{9}方向图偏离零频位置为0');