Atec Rohde-Schwarz-SMF100A - Manual (Page 11)

Testing of the distance and antenna direction display of the radar equipment
Double pulses
RF signal
Time
T
1
T
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t
2
t
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Pulse train (with the ¸SMF-K27 pulse train option)
RF signal
Time
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n
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t
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n-1
Single pulses
RF signal
Time
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Pulsed transmitter
Pulse generator
Display
LO RF
Sideband
filter
Circulator
Pulse 1
2
Antenna
Antenna direction pulse
¸SMF100A Microwave Signal Generator 11
Aerospace & defense applications
The ¸SMF100A can also be used in
pulse radar applications with a rotating
antenna. In the example (see figure), the
external pulse from the pulse generator
is applied to the external pulse input of
the ¸SMF100A and used as a trigger
for the internal pulse generator and
modulator. You can delay this trigger in
order to perform distance and direction
simulations and check them on the radar
equipment's display.
For generating more complex pulse sce-
narios, the ¸SMF100A offers a new
feature – based on its pulse modulator
and pulse generator concept – using the
¸SMF-K27 pulse train option. In con-
trast to single or double pulses, "pulse
trains" are a combination of different
pulses, which can be a periodical or
non-periodical set of pulses. The built-in
optional pulse generator makes it now
possible to generate these "pulse trains",
which are commonly used for radar ap-
plications. Pulse width as well as pulse
pause can be set independently and
separately for each pulse. This makes it
possible to generate staggered pulses or
to apply jitter to pulse width as well as
pulse pause.
In contrast to ARB solutions, the greatest
advantage is the much better performance
of the pulse modulator with respect to
ON/OFF ratio, rise and fall time, etc.
SMF_bro_en_5213-7660-12_v0201.indd 11 13.02.2009 15:44:21