Radar Target Generator - RTG1002 Edition Date: 19-Apr-18
Frequency: counted, starting from Sample Offset … us, after the trigger event during the 'frequency
measurement period'
Pulse width: time between rising and falling edge of the trigger event. If the trigger level is at -3dB
from the pulse level, then pulse width is measured the way it should be.
Period: elapsed time between the previous trigger event and current one.
Rx antenna power: = RX power RTG input + attenuator B f(measured frequency) [equalize table
mod1]
Tx power RTG output: calculated power of the target, you can verify this power on a spectrum
analyzer. Do not verify this power level on a broadband power detector, because of the spurious
signals. You can see the real time effect of switching the adaptive beam modulation on or off in this
view.
Modulator 2: = modulator 2 - attenuator A f(measured frequency) [equalize table mod2] - attenuator
B f(measured frequency) [equalize table mod2]
This is the value of attenuation between the two SMA-connectors of modulator 2. If modulator 2 is
used as an attenuator of -20dB for example but when it is connected with two cables of 2dB loss for
the measured frequency, then the window will indicate the remaining decibels, in this example 16dB.
Time stamp: GPS time stamp of the trigger event, when GPS is connected. If no GPS then this is a
relative time stamp. This may be useful to interpret the timing of the sidelobes of the antenna, when
the trigger level is too low.
2.2.1.3. Target Setup Parameters
Type: The type control determines which swerling case type is being generated. You have the selection
between Fixed RCS and Swerling case I through IV.
• A fixed RCS
• Swerling I modulates the pulse power from scan to scan with a Rayleigh distribution
• Swerling II modulates the pulse power from pulse to pulse with a Rayleigh distribution
• Swerling III modulates the pulse power from scan to scan with a modified distribution (in case of one
main scattering element)
• Swerling IV modulates the pulse power from pulse to pulse with a Rayleigh distribution (in case of
one main scattering element)
RCS: The simulated Radar Cross Section: This parameter determines the amount of power that is being
reflected by a real target and as such also how much power the RTG1002 sends back to the radar. The
power as it would be received by the radar in the simulated condition can be verified in the didactical
drawing.
Following parameters are only relevant when the scenario mode is set to fixed target. For moving target, the
scenario data is used:
• Target Range: this control sets the target range as it would appear on the radar's PPI or output data,
for a fixed target. This control can be set by means of the slider or numerical control.
• Elevation: The elevation of the simulated target. This parameter is used to calculate the lens effect
and the atmospheric attenuation for the target.
• Doppler frequency: This control allows the user to set the correct Doppler frequency for fixed
(static) targets. For moving targets, the Doppler is automatically created using the target known
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