k k20 kr ke cos 2kT cos 0 sin 2ki kr 2kr2kr 2(r)? 2kT 2kT kr b2=200)M=2 2 cos ko, !2 rr cos(ko, T kO, ko Tk2丌。T(.k2r sIn sin o T sin o t +-sin 20,t +-sin 30,t k=1,2,3, 2丌 1()=1+2cos+459)-5sin(21+45°)+coS3+759)4 1()=1+2cos(+45°)+15c0s21+45°-|+cos7+75°) 2 i()=1+2cost+-+1.5cs2 + cos 3t 4 I2n1.52.259 12 3 1=√l2+12+l2+12=1l+2+ +16+9+4 =4625 北京邮电大学网络学院罗老师编( ) ( ) ( ) ( ) ( ) 1 1 0 1 1 1 0 0 1 1 1 0 1 1 1 1 ' 0 1 0 1 1 cos sin 2 2 sin 2 sin 1 sin cos cos 2 cos 2 ω ω π ω ω π ω ω ω ω ω ω ω ω k k t k t k t k dt k k t k T k t t T k k t t k t dt v x k t v x T f t k t dt T a T T T T k = − = + = = = = ∫ ∫ ∫ ( ) ( ) ( ) ( ) ( ) sin 3 LL 1,2,3,L 3 1 sin 2 2 1 sin 1 2 1 sin 0 2 0 sin 2 cos 2 cos 2 cos sin 2 1 1 2 1 2 1 2 1 2 cos0 2 1 cos 2 sin 2 1 1 1 1 0 1 1 1 0 1 1 0 2 ⎟ = ⎠ ⎞ ⎜ ⎝ ⎛ = − + + + ⎟ = ⎠ ⎞ ⎜ ⎝ ⎛ = − − − = = − ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ = + − = − = − ∫ ∫ f t t t t k k T T k T k T T k T k T dt k k t k T k t t T f t k t dt T b k k k k k k k k k k T T T k ω ω ω π π π π π π ω ω ω ω ω π π π π π π π π π π （ 3 ） i( )t = 1+ 2cos(t + 45°)−1.5sin(2t + 45°)+ cos(3t + 75°)A ( ) ( ) ⎟ + ( ) + ° ⎠ ⎞ ⎜ ⎝ ⎛ = + + ° + + ° − cos 3 75 2 i t 1 2cos t 45 1.5cos 2t 45 t π ( ) ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ ⎟ + + ⎠ ⎞ ⎜ ⎝ ⎛ ⎟ + − ⎠ ⎞ ⎜ ⎝ ⎛ = + + 12 5 cos 3 4 1.5cos 2 4 1 2cos π π π i t t t t （4） I 0 = 1A P I W I I I I I A I I A I I A I I T m m m 4.625 8 37 1 8 37 8 8 16 9 4 2 1 8 9 1 2 2 1 2 8 9 2 2.25 2 1.5 2 2 2 2 2 2 2 3 2 2 2 1 2 0 3 3 2 2 1 1 = × = = = + + + = + + + = + + + = = = = = = = = = = 北京邮电大学 网络学院 罗老师编 9