Stat+p(oI 瞬时频率 do(t) 瞬时频率偏移 dt 乡相位调制()=km(t) s (t)=Acoslot+k m(t) 乡频率调制dq(t) =k,m() dt P(t)=k,m(r)dt (t)=Acos[O t+I k, m(r)]11 瞬时频率 瞬时频率偏移 相位调制 频率调制 dt d t t c [ +( )] dt d(t) (t) k m(t)  = p s (t) Acos[ t k m(t)] m =  c + p ( ) ( ) k m t dt d t = f  = − t f (t) k m( )d ( ) = cos[ +  ( ) ] − t m c f s t A  t k m  d