Analysis of Unknown or Complex Signal Scenarios: R&S®GX410 R&S®AMLAB Signal Analysis Software
Analysis of Unknown or Complex Signal Scenarios: R&S®GX410 R&S®AMLAB Signal Analysis Software
Radiomonitoring & Radiolocation
Analysis Software ❙❙ Signal extraction from the wideband signal record using
digital downconversion (DDC)
❙❙ Time and frequency domain signal analysis for
2
R&S®GX410 Automatic signal d
results
etection for fast and reliable
System integration
❙❙ Use as standalone system
❙❙ Use with R&S®AMMOS automatic production system
❙❙ Optional D/A converter board
▷▷ page 21
interface for nized in a project (file tree) structure that is used for navi-
gation and for starting the following processing steps. All
relevant data is stored in an SQL database.
controlling all
analysis functions
4
Main overview showing Modulation Analysis tab,
Projects tab and case-sensitive controls.
Modulation Analysis tab: shows the time domain
analysis for selected emissions.
Projects tab: contains the navigation center with all
signal samples and calculated analysis results.
Case-sensitive controls for the R&S®GX410
processing steps (signal acquisition, detectors, etc.).
6
Calculation of signal-adapted spectrograms
Using the signal sample, a spectrogram is calculated. The
operator can calculate several spectrograms (with differ-
ent FFT lengths, for example, window types and overlap
factors may be used according to special emission types).
The spectrogram is presented in a zoomable and scrollable
window. Additionally, a spectrum can be activated.
and reliable results search criteria (such as frequency range of interest, emis-
sion power and bandwidth). The emission list is stored in
the database and serves as a starting point for the modula-
tion analysis.
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Assisting the Powerful R&S®AMMOS classification unit
The R&S®GX410 contains the powerful R&S®AMMOS clas-
sification unit for the HF and VHF/UHF frequency ranges
user by automatic and can recognize the modulation type and transmission
system of a huge variety of analog and digital signals.
Information about supported modulation types included
Automatic measurement/classification
of fixed-frequency signals.
In-depth modulation analysis with measurement Using automatic and manual measurement
cursors in zoomable spectrogram together
Manual measurements of emission characteristics (band- The system's interactive modulation analysis feature is the
width, duration, S/N ratio) can be performed with mea- most powerful way to quickly achieve reliable modulation
surement cursors in the zoomable spectrogram. analysis. The automatic classification algorithm displays
all its results in a wizard, giving the operator access to all
For in-depth measurements, the selected emission is relevant intermediate results (including time and frequency
transferred (via DDC) to high-resolution modulation analy- segmentation, primary demodulation, symbol rate estima-
sis. The filter bandwidth is automatically adapted to filter tion, equalization, harmonic analysis and sampling).
out all disturbing out-of-band emissions and noise.
The operator can verify the output of the automatic clas-
sification process one step at a time and concentrate on
analysis steps where the algorithmic output might need
manual refinement. A new classification process can then
be started, taking into account the expert settings.
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Detailed high-precision time
domain analysis.
time signals automatic detection has a special algorithm for SSB short-
time signals. By manual or automatic measurement of
some of the emissions (duration, bandwidth, S/N ratio),
the operator can set up a search pattern for the detection
algorithm. The algorithm will scan the signal sample to de-
tect all emissions that fit the defined pattern.
Detected bursts.
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Evaluation of detected emissions for short-time
signals
The R&S®GX410 provides several statistical evaluation
algorithms for the detected list of emissions.
¸GX410 ¸AMLAB
J General signal analysis visualization and measurement tools
J Demodulators/decoders
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Detection and extraction of frequency-agile
short-time emissions
In the R&S®GX400 sensor groups, the wideband IF data
streams are processed on multiple parallel R&S®GX401EM
VXI DDC/DSP signal processing modules. R&S®GX403DS,
a detection algorithm for short-time emissions, automati-
cally detects and extracts all relevant short-time emissions,
and then transfers these signals to R&S®GX413OR for
processing. The user may set all adjustable parameters of
the detection algorithm, e.g. short-time emission length,
short-time emission bandwidth or minimum signal-to-
noise ratio.
Profile recognition
The profile recognition will automatically match the tech-
nical parameters of the detected transmissions with user-
defined profiles. The result list provides an overview of the
activity of hopper radios.
Example
Start time Stop time Profile Duration Technical parameters
10:15:20 10:15:29 Digital Radio A 9s 300 hops/s, FSK2, etc., 60 MHz to 70 MHz/25 kHz
10:15:25 10:15:27 Digital Radio B 2s 100 hops/s, FSK2, etc., 45 MHz to 51 MHz/25 kHz
10:15:33 10:15:40 Digital Radio A 7s 300 hops/s, FSK2, etc., 60 MHz to 70 MHz/25 kHz
10:16:01 10:16:12 Analog Radio 11 s 10 hops/s, AM, etc., 55 MHz to 56 MHz/25 kHz
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Recombination of frequency-agile short-time
emissions
After the transmissions have been separated,
R&S®GX413OR performs signal recombination for each of
them.
Online processing
¸GX410 system,
sensor group control,
LAN evaluation, recombination and
storage of detected bursts
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Configuration example for combined online frequency is fed back to the wideband receivers by the
processing and recording/replay processing R&S®GX425. The following processing steps – detection,
This configuration, like the online configuration, can cover extraction, recombination, etc. – are identical to those in
a bandwidth of 15 MHz to 60 MHz (3 × 20 MHz). In the online processing. If more than 3000 short-time emissions
defined frequency range, up to approx. 3000 short-time per second are detected simultaneously, the replay speed
emissions per second can be detected and extracted in re- of the R&S®GX425 will be reduced as long as necessary.
altime. All detected short-time emissions are recombined, This makes sure that no data is lost even if significantly
and the signals are stored as digital intermediate frequen- more short-time emissions are present than can be pro-
cy in the R&S®GX410 system. Technical parameters are cessed in realtime.
transferred to the system level for processing. One of the
signals can be processed immediately in the R&S®GX410 The configuration consists of one R&S®GX410 system with
system. the R&S®GX413RC and R&S®GX413OR options as well as
three R&S®GX400 sensor groups and three R&S®GX425.
If more than approx. 3000 short-time emissions per sec- R&S®GX413RC controls the R&S®GX400 sensor groups
ond are received in the monitored frequency range, seam- and the R&S®GX425. R&S®GX413OR automatically evalu-
less processing can no longer be achieved with the avail- ates the data that has been provided online or from a
able online resources. The system reports these moments recording. E very R&S®GX400 sensor group includes one
to the user. Even as online processing is taking place, VHF/UHF wideband receiver (R&S®EM050 in combination
seamless recording of the digital intermediate frequencies with R&S®GX405BP) and six R&S®GX401EM VXI DDC/DSP
of all wideband receivers can be initiated. signal processing modules. The sensor groups are syn-
chronized to a common time base via GPS time and linked
The recorded digital intermediate frequency can be re- to the R&S®GX410 system via Gigabit Ethernet. Each wide-
played later. The system is switched offline in this case, band receiver is connected to one R&S®GX425 unit and
i.e. work is no longer performed on the antenna, but with can store its broadband intermediate frequency.
the recorded IF data instead. The wideband intermediate
FPDP
¸GX410 system,
sensor group and
recording/replay control,
FPDP LAN evaluation, recombination and
storage of detected bursts
FPDP
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System Use as standalone system
The R&S®GX410 can be used as a standalone system for
HF and VHF/UHF technical analysis. Signal samples may
System integration
R&S®GX400 sensor group R&S®GX425 recording/replay unit (AMREC)
For more information, see the data sheet for the R&S®AMMOS system family.
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