Rohde & Schwarz SMIQ02B - Page 145

Fading Simulation SMIQ
1125.5555.03 2.76 E-9
FREQ RATIO
Input value of the ratio of the actual Doppler Frequency shift to the Doppler
Frequency setting with Ricean fading or Pure Doppler switched on. The actual
Doppler Frequency shift depends on the simulated angle of incidence of the
discrete component.
IEC/IEEE-bus command :SOUR:FSIM:PATH6:FRAT 1
ϕ
/ deg 0 90 180
FREQ RATIO -1 0 +1
ϕ
Fig. 2-40 Doppler Frequency shift with moving receiver
CONST PHASE
Entry value of CONST PHASE with CPHAS fading switched on. The
corresponding path is multiplied by this phase.
IEC/IEEE-bus command :SOUR:FSIM:PATH6:CPH 20.0
SPEED
Input value of the speed v of the moving receiver.
The Doppler frequency f
D
(DOPPLER FREQ) is calculated from the speed and
the RF frequency f
RF
. When changing SPEED the parameter DOPPLER
FREQ will be automatically adjusted. This parameter can be coupled, see
parameter COUPLED PARAMETERS...
Range:
v
ms
f
RF
min
./
=
⋅003 10
92
v
ms
f
RF
max
/
=
⋅479 10
92
h/km99999v
max
≤
IEC/IEEE-bus command :SOUR:FSIM:PATH1:SPE 100
DOPPLER FREQ
Input value of the amount of the maximum Doppler Frequency shift (cf. FREQ
RATIO).
When changing the Doppler Frequency f
D
the parameter SPEED will be
automatically adjusted.
With
cms=⋅2998 10
8
.
/
it is
v
c
f
f
D
RF
=
IEC/IEEE-bus command :SOUR:FSIM:PATH2:FDOP 92.3
PATH LOSS
Input value of the attenuation of the path.
IEC/IEEE-bus command :SOUR:FSIM:PATH3:LOSS 3
DELAY
Input value of the signal delay in the path.
IEC/IEEE-bus command :SOUR:FSIM:PATH3:DEL 14.5