sar_echo.m

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ra=zeros(Npt_num, length(xa));      % calculate every point target's slant range history
for i=1:Npt_num                                    
	ra(i,:)=sqrt((Ra*sin(theta)+R0(i)).^2+(xa+x0(i)).^2);		 
end   

rmax=max(max(ra));						% max. slant range
rmin=min(min(ra));						% min. slant range
rmc=fix((rmax-rmin)/bin_r);			% range migration,	number

rg=0*ra;                            % initialize 
rg=fix((ra-rmin)/bin_r+1);				% range gate index caused by range migration
rgmax=max(max(rg));
rgmin=min(min(rg));

nr=round(Tp*Fs);							% samples of a pluse
tr=1:fix(nr)+1;