陈醋鲈鱼1 陈醋鲈鱼1
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求助一个信号处理中的微积分问题 要求如下图所示 就是定义了两个信号和两个多变量函数,要求计算两信号对应的多变量函数在一定区间上积分所得的关于t的单变量函数,并画出相关图象 我初步写了两段代码但是都报错或者有问题,麻烦大佬帮我看一下 f0=150; m=400; T=1; f1=550; k=(f0-f1)/(f0*f1*T); fs=2500; Ts=1/fs; xlfm[t_]:=Exp[I*2Pi*(f0*t+m*t^2*0.5)]; xhfm[t_]:=Exp[I*2Pi*((1/k)Log[1+k*f0*t])]; Xnblfm=Integrate[xlfm[t]*Conjugate[xlfm[t-tao]]*Exp[2Pi*I*fd*t],{tao,-Infinity,Infinity},{fd,-100,100}]; Xwblfm=Sqrt[Abs[a]]*Integrate[xlfm[t]*Conjugate[xlfm[a(t-tao)]],{tao,-Infinity,Infinity},{a,0.8,1.2}]; Xnhfm=Integrate[xhfm[t]*Conjugate[xhfm[t-tao]]*Exp[2Pi*I*fd*t],{tao,-Infinity,Infinity},{fd,-100,100}]; Xwbhfm=Sqrt[Abs[a]]*Integrate[xhfm[t]*Conjugate[xhfm[a(t-tao)]],{tao,-Infinity,Infinity},{a,0.8,1.2}]; 后来改了一下是这样的 f0=150; m=400; T=1; f1=550; k=(f0-f1)/(f0*f1*T); fs=2500; Ts=1/fs; xlfm=Exp[I*2Pi*(f0*t+m*t^2*0.5)]; xlfm1=Exp[I*2Pi*(f0*(t-tao)+m*(t-tao)^2*0.5)]; xlfma=Exp[I*2Pi*(f0*a(t-tao)+m*a (t-tao)^2*0.5)]; xhfm=Exp[I*2Pi*((1/k)Log[1+k*f0*t])]; xhfm1=Exp[I*2Pi*((1/k)Log[1+k*f0*(t-tao)])]; xhfma=Exp[I*2Pi*((1/k)Log[1+k*f0*a(t-tao)])]; Xnblfm=Integrate[xlfm*Conjugate[xlfm1]*Exp[2Pi*I*fd*t],{tao,-0.1,0.1},{fd,-100,100}]; Xwblfm=Sqrt[Abs[a]]*Integrate[xlfm*Conjugate[xlfma],{tao,-0.1,0.1},{a,0.8,1.2}]; Xnhfm=Integrate[xhfm*Conjugate[xhfm1]*Exp[2Pi*I*fd*t],{tao,-0.1,0.1},{fd,-100,100}]; Xwbhfm=Sqrt[Abs[a]]*Integrate[xhfm*Conjugate[xhfma],{tao,-0.1,0.1},{a,0.8,1.2}]; 错误信息见下图
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