Basics on I/Q Data Acquisition and Processing
R&S
®
FSWP
30User Manual 1177.5856.02 ─ 07
Figure 4-5: Overlapping FFTs
In "Manual" or "Auto" FFT mode, an FFT length of 4096 and a window length of 4096
(or the record length, if shorter) is used to calculate the spectrum.
Combining results - trace detector
If the record length permits, multiple overlapping windows are calculated and combined
to create the final spectrum using the selected trace detector. If necessary, the trace
detector is also used to reduce the number of calculated frequency points (defined by
the FFT length) to the defined number of measurement points. By default, the Auto-
peak trace detector is used.
Since the frequency points are reduced to the number of measurement points, using a
detector other than "Auto Peak" and fewer than 4096 measurement points can lead to
false level results.
4.5.3 Dependencies Between FFT Parameters
FFT analysis in the R&S FSWP is highly configurable. Several parameters, including
the resolution bandwidth, record length, and FFT length, are user-definable. Note,
however, that several parameters are correlated and not all can be configured inde-
pendently of the others.
Basics on FFT
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