【雷达信号分析】基于matlab LFM线性调频信号时域分析【含Matlab源码 3026期】.zip

function [naf, tau, xi]=ambifunb (x, tau, N, trace) % if (nargin == 0) % error('At least one parameter required'); % end [xrow,xcol] = size(x); % if (xcol==0)|(xcol>2) % % error('X must have one or two columns'); % end if (nargin == 1) if rem(xrow,2)==0 tau=(-xrow/2+1):(xrow/2-1); else tau=(-(xrow-1)/2):((xrow+1)/2-1); end N=xrow; trace=0; elseif (nargin == 2) N=xrow; trace=0; elseif (nargin == 3) trace=0; end [taurow,taucol] = size(tau); if (taurow~=1) error('TAU must only have one row'); elseif (N<0) error('N must be greater than zero'); end naf=zeros (N,taucol); if trace disp('Harrow-band ambiguity function') end for ico1=1:taucol if trace disprog (icol, taucol, 10) end taui=tau(ico1); t=(1+abs(taui)):(xrow-abs(taui)); naf(t,ico1)=x(t+taui,1).* conj(x(t-taui,xcol)); end naf=fft(naf); naf=naf([(N+rem(N,2))/2+1:N 1:(N+rem(N,2))/2],:); xi=(-(N-rem(N,2))/2:(N+rem(N,2))/2-1)/N; if (nargout==0) contour(2*tau,xi,abs(naf).^2); % surf(2*tau,xi,abs(naf).^2,16) grid on xlabel('Delay'); ylabel('Doppler'); shading interp title('Narrow-band ambiguity function'); end