. , x(t) wo, , u(t) j(t):
x(t) = u(t) cos (wot+j(t)). (10.2.1)
(10.2.1) :
x(t) = a(t)×cos(wot) + b(t)×sin(wot), (10.2.2)
a(t) b(t) x(t):
a(t) = u(t) cos jt, b(t) = u(t) sin jt.
u(t) = , tg j(t) = b(t)/a(t).
x(t) (t). (t) (10.2.2) :
(t) = a(t)×sin(wt) b(t)×cos(wot).
z(t) = x(t) + j× (t).
z(t):
|z(t)|2 = x2(t)+ 2(t) = a2(t)[cos2(wot)+sin2(wot)] + b2(t)[cos2(wot)+sin2(wot)] = u2(t).
, u(t) f(t) x(t):
u(t) = . (10.2.3)
f(t) = wot+j(t) = arctg[ (t)/x(t)]. (10.2.4)
j(t) = f(t) - mot.
:
df(t)/dt = . (10.2.5)
. 10.2.1.
- (. . 10.2.1). (10.2.3-10.2.5), , .
. 10.2.2. , :
x(t) = a(t)×cos(w1t) + b(t)×cos(w2t).
:
(t) = a(t)×sin(w1t) + b(t)×sin(w1t).
z(t) = x(t) + j× (t).
. 10.2.2.
, 10.2.2, (10.2.3). :
u(t) = ,
.
, . 10.2.3, :
f(t) = .
. 10.2.3. . 10.2.4.
(. 10.2.4) , , :
w(t) = .
, .
. .
. :
x(t) = Uo×[1+m×s(t)]×cos wot, s(t) £ 1, m £ 1
:
(t) = Uo×[1+m×s(t)]×sin wot, zx(t) = x(t) + j (t).
x(t):
u(t) = |zx(t)| = Uo×[1+m×s(t)],
|
|
.. (. . 10.2.5)
. 10.2.5. .
. , . 10.2.6:
x(t) = Uo×s(t)×cos wot,
, , x(t):
(t) = Uo×s(t)×sin wot, zx(t) = x(t) + j (t), u(t) = |zx(t)| = Uo×|s(t)|.
x(t) , .
. 10.2.6. .
. ( ) h(t), t ³ 0, H(f):
H(f) = X(f) - jY(f),
:
h(t) = x(t) + y(t),
x(t) = X(f) cos(2pft) df,
y(t) = Y(f) sin(2pft) df,
x(t) y(t) - h(t). y(t) x(t):
y(t) = sgn(t)×x(t). (10.2.6)
(10.2.6) (sgn(t) Û -j/(pf)), :
TF[y(t)] = (-j/pf) * X(f) = (-j/p) [X(u)/(f-u)] du.
:
Y(f) = (1/p) [X(u)/(f-u)] du = [X(f)],
.. ( ) . , :
X(f) = -[Y(f)] = -(1/p) [Y(u)/(f-u)] dv.
1. .. : . - .: , 1988.
2. ., . . .: , 1989. 540 .
25. .. . .: , 2003. 608 .