2014年电子科技大学856测控通信原理考研真题.pdf

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1、 4 1 2014856 3 24 6 71 )1()1()(1tututtx )(txa 0Im,kkkaaa b 0Im,kkkaaac 0Re,kkkaaa d 0Re,kkkaaa2 dtttu211)1(a 2 b -2 c -1 d 1 3 LTI 2,1,0,1,2,1 nnx 2,1,0,1,1,3,3,1 nnynha 1,0,1,1 nnh b 0,1,1,1 nnhc 2,1,1,1 nnh d 0,1,2,1 nnh4 )(th 1dttdtx)()(5.0|)(ttya -1 b -0.5c 1 d 0.5 15a b c d6 )(tha )3()1()( ttet

2、htb )2()(cos)(5.0tuetthtc )1()1()( ttethtd )2()2cos()( tuetthtkkttxtx )8()()(14 2 7 ttttx 10cos5sin2cos)(133)(jH44 33a b)(jH144)(jH10 33c d8 2a b c d0,0,)(jjjH)(tx)(tytccostsin2 4 241 )21(2)( ujF )(tx =2 )()( jHjGK1 )()( sHsG3njnjeenx3.02.0)(4 )(2 tuet=5 )(tx BHz )2( txNf =6 LTI )(sH S4 3 301 10 e(t

3、)= 2e-t u(t)c = 12 103 10 x(t) X( ) 3 x(t)(X42 42423 721 20 412 )(zH3 nh42 20 LTI )(tx )(ty)()()(6)(5)(22txdttdxtydttdydttyd1 )(sH2 )(th3 )()( tutx )(ty41Z0.5nx ny44 4 3 12 5 KsA )(231)(1ssA11)(2ssF2)(1sF1)()(sXsY2 K)(sX )(sY)(1sF)(1sA)(2sA)(2sF5 4 20 6 )(tx )(ty )( jX 7)(1tr )(2tr )(3tr )(ty)(tx )(ty)3cos( tc)cos( tc)(1tr)(2tr )(3tr)(1jHc3c c3c)(2jHc c6)(jXc201c27