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Новости строительства

827:

827 0688759652

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2963-2 (RUS) . :

2963-2

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MATLAB DSP.

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     x(n) ޣ {ai} {bi}:

    , (1) :

A(q)y(n)=B(q)u(n).     (1)

     B(q)/A(q), , G(q), Ϡ

G(q) = B(q)/A(q)

     [1], Matlab (),

G(z) = B(z)/A(z),

     A(z) B(z) z- {a} {b}:

     , G(q) є.

. 1.

     v, , y e H. G, . , .1,

y(n)=G(q)u(n)+H(q)e(n),     (2)

    

     .2.

    

A(q)y(n)=B(q)u(n)+e(n)     (3)

     ARX-, AR (AvtoRegressive) A(q)y(n), X (eXternal) , u(n). (3), (2) H(q) = 1/A(q) G(q) = B(q)/A(q).

  ARX-

. 2. ARX-

     v(n) , ARMAX-:

A(q)y(n)=B(q)u(n)+C(q)e(n).     (4)

    MA- (Moving Average) C(q)e(n),

     (2) (4) , ARMAX- H(q) = C(q)/A(q). .2.

  ARMAX-

. 2. ARMAX-

     (2) :

     (5) .2. (3) (4) . , (3), (4) (5) , , . , ţ ( A(q), B(q) ) ( ). , (5) , , (3) (4). [1] , (5), .

. 2.

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y(n)= 0,12u(n 1)+ 0,055752u(n 2) +
+ 2,0549y(n 1) 1,756677y(n 2) +
+ 0,576335y(n 3) +
+ e(n) e(n 1) + 0,2e(n 2).     (6)

     , Simulink Matlab. Simulink, , , [4-7]. (6) .3. (, ), ( b(2), b(3), a(2)a(4)), ( 1/z), (Input Noise) (Output) .

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     Signal Generator, Random Number, To Workspace To Workspace1. . : , .

     Simulation, Parameters ģ , (. 6). T. T=1e-4 ( Matlab).

. 6.

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     , ident. ( ) ident, .7. , .

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  1. Model output. ( ޣ ) . .10 . , , , ӣ .

    . 10.

         Options , , ( Error plot), a- ( Set confidence level Show a% confidence intervals), (Set prediction horizon n step ahead predicted output). ,

         N ߣ ( ). N Customized time span for fit Options.

  2. Model resids , Walidation Data. .

  3. Noise Spectrum , v=He(n) (2):

    y(n) = G(q) u(n) + v(n).


  4. Transient resp Frequency resp , , Zeros and poles ţ .

     ( ) ӣ . (, , , .). , ident, ģ .

     , , (, .), ԣ Matlab.

     ( , , ), , Ȕ , .

     ident , Matlab ( Š Simulink).

     , , ident , .

  1. Ǡ. . .: . . . .-. . 1991. 432 .
  2. Π.. . .: . 1984. 320 .
  3. / . .. .: . 1983. 400.
  4. נ.., .. Matlab5.0/5.3. . .: . 1999. 633.
  5. נ.. Windows. .: . 1999. 288 .
  6. Π.. - . ؠ1 // Chip News. #2 2000, .4-7.
  7. Π.. - . ؠ2 // Chip News #3 2000, .26-29.
  8. . DTMF // Chip News #4 2000, .48-52. Chip News #5 2000, .12-16.
  9. ., ., . GUI Wavemenu // Chip News #6 2000, .2-8. Chip News #7 2000, .16-19.

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