.


:




:

































 

 

 

 


[1, 25, 29]




.

() (correlation function, CF). , s(t), t:

Bs(t) = s(t) s(t+t) dt. (2.4.1)

, t. , , t = 0 ( 1):

Bs(0) = s(t)2 dt = Es.

. t = t-t (2.4.1):

Bs(t) = s(t) s(t-t) dt = s(t-t) s(t) dt = Bs(-t).

, t. +t (2.4.1) , t s(t+t) t. 0-, , . , .. (2.4.1) s(t-t):

Bs(t) = s(t) s(t-t) dt. (2.4.1')

t , , , :

= 0.

. (0,) , . .

t , 0≤t≤T t . :

Bs(t) = A2 dt = A2(T-t).

, -T≤t<0 0 -t. :

Bs(t) = A2 dt = A2(T+t).

|t| > T ( ).

, :

Bs(t) = .

, :

Bs(t) = (1/) s(t) s(t-t) dt.

t=0 , . . , s(t) = A cos(w0t+j0) T=2p/w0 :

Bs(t) = A cos(w0t+j0) A cos(w0(t-t)+j0) = (A2/2) cos(w0t).

, , .

, [a, b], [a, b]:

Bs(t) = s(t) s(t+t) dt. (2.4.2)

, :

Bs(t) = . (2.4.2')

, ( ):

rs(t) = cos j(t) = ás(t), s(t+t)ñ /||s(t)||2.

() (cross-correlation function, CCF) ( ), (2.4.1), , , t:

B12(t) = s1(t) s2(t+t) dt. (2.4.3)

t = t-t (2.4.3), :

B12(t) = s1(t-t) s2(t) dt = s2(t) s1(t-t) dt = B21(-t)

, , t = 0. . 2.4.1, 0.5 1.5. (2.4.3) t s2(t) ( s1(t) s2(t+t)).

. 2.4.1. .

t=0 B12(t)=0. 12(t) s2(t) t=1, s1(t) s2(t+t). B21(-t) s1(t) t, B21(-t) ( t=0) B12(t), . . 2.4.2 .

. 2.4.2. .

, t , t (2.4.3) .

, , , .

( ):

rsv(t) = cos j(t) = ás(t), v(t+t)ñ /||s(t)|| ||v(t)||. (2.4.4)

-1 1.





:


: 2015-05-06; !; : 1188 |


:

:

! . .
==> ...

1002 - | 826 -


© 2015-2024 lektsii.org - -

: 0.017 .